how to write a materials research paper

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4 Writing the Materials and Methods (Methodology) Section

The Materials and Methods section briefly describes how you did your research. In other words, what did you do to answer your research question? If there were materials used for the research or materials experimented on you list them in this section. You also describe how you did the research or experiment. The key to a methodology is that another person must be able to replicate your research—follow the steps you take. For example if you used the internet to do a search it is not enough to say you “searched the internet.” A reader would need to know which search engine and what key words you used.

Open this section by describing the overall approach you took or the materials used. Then describe to the readers step-by-step the methods you used including any data analysis performed. See Fig. 2.5 below for an example of materials and methods section.

Writing tips:

• Explain procedures, materials, and equipment used
• Example: “We used an x-ray fluorescence spectrometer to analyze major and trace elements in the mystery mineral samples.”
• Order events chronologically, perhaps with subheadings (Field work, Lab Analysis, Statistical Models)
• Use past tense (you did X, Y, Z)
• Quantify measurements
• Include results in the methods! It’s easy to make this mistake!
• Example: “W e turned on the machine and loaded in our samples, then calibrated the instrument and pushed the start button and waited one hour. . . .”

Technical Writing @ SLCC Copyright © 2020 by Department of English, Linguistics, and Writing Studies at SLCC is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License , except where otherwise noted.

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Materials and Methods: 7 Writing Tips

• Peer Review
• Research Process

Here are some tips for writing a good Materials and Methods section, which can lead to reproducibility of your results and credibility in the eyes of reviewers and readers.

Updated on January 2, 2011

One critical aspect of publishing research is describing the methods used in enough detail that the experiments can be reproduced by others. Some manuscripts are rejected because there is insufficient detail in the methods section.

In an editorial for the American Journal of Roentgenology , James Provenzale says, “ One of the more common reasons for rejection of a manuscript is that the reviewers cannot fully understand how the study was conducted. ” However, several journals have page limits or page charges, and the Materials and Methods section can take up valuable space.

For more tips on writing the Materials and Methods section of your manuscript, please see our downloadable white paper, Setting the Scene: Best Practices for Writing Materials and Methods .

What are the most important things to include, and how can you be sure that you're being concise AND sufficiently thorough? Here are seven tips for writing a good Materials and Methods section, which can lead to reproducibility of your results and credibility in the eyes of reviewers and readers. This list is not exhaustive; always remember to check the instructions for authors from your target journal for additional requirements or suggestions.

7 Tips for Writing an Effective Materials and Methods Section in Your Research Manuscript:

1. begin writing the materials and methods while you are performing your experiments..

Writing during the research process will prevent you from forgetting important details and save you time when you begin writing the full manuscript. You can also ask co-authors who performed specific experiments to write the corresponding parts of the Methods section.

2. Start with general information that applies to the entire manuscript and then move on to specific experimental details.

Examples of general information that you could begin with are characteristics of the study population, sources and genotypes of bacterial strains, or descriptions of samples or sample sites. Then, you could share more details about your experiment.

3. Match the order in which methods are described to the order of the results that were generated using those methods.

Also, be sure that each method you used is described, even if it is just a quick sentence (e.g., “Toxin assays were performed as described [reference]”). This practice is helpful for transparency, as well as reproducibility.

4. Always include citations for procedures that have been described previously.

If you made any modifications, be sure to list them.

5. Describe statistical tests as fully as possible.

Give as much information about the tests as possible; just mentioning a t -test is not sufficient for the reader to determine if the correct statistical analysis was performed.

6. Avoid discussing the pros and cons of certain methods or results of any kind.

Save evaluations for different methods for the Discussion section of your paper.

7. To save space, be concise, yet thorough, when listing the equipment you used.

You might consider listing all of your equipment purchased from a single company in one sentence. Or, you could create a flowchart figure of the steps in an important procedure.

Before you finish your manuscript, ask yourself the following questions about your Materials and Methods section to ensure that you have included all important information.

1. Is there sufficient detail so that the experiments can be reproduced?

2. Is there excess information that could be removed without affecting the interpretation of the results?

3. Are all the appropriate controls mentioned?

4. Are all appropriate citations included?

5. Is the source of each reagent listed?

Writing the Materials and Methods can be tedious, but a well-written section can enhance your chances of publication and strengthen your conclusions. If you have further questions, download our free white paper on writing the Materials and Methods section or send us an email . Best of luck with your research!

Ben Mudrak, PhD

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• How to Write Your Methods

Ensure understanding, reproducibility and replicability

What should you include in your methods section, and how much detail is appropriate?

Why Methods Matter

The methods section was once the most likely part of a paper to be unfairly abbreviated, overly summarized, or even relegated to hard-to-find sections of a publisher’s website. While some journals may responsibly include more detailed elements of methods in supplementary sections, the movement for increased reproducibility and rigor in science has reinstated the importance of the methods section. Methods are now viewed as a key element in establishing the credibility of the research being reported, alongside the open availability of data and results.

A clear methods section impacts editorial evaluation and readers’ understanding, and is also the backbone of transparency and replicability.

For example, the Reproducibility Project: Cancer Biology project set out in 2013 to replicate experiments from 50 high profile cancer papers, but revised their target to 18 papers once they understood how much methodological detail was not contained in the original papers.

What to include in your methods section

What you include in your methods sections depends on what field you are in and what experiments you are performing. However, the general principle in place at the majority of journals is summarized well by the guidelines at PLOS ONE : “The Materials and Methods section should provide enough detail to allow suitably skilled investigators to fully replicate your study. ” The emphases here are deliberate: the methods should enable readers to understand your paper, and replicate your study. However, there is no need to go into the level of detail that a lay-person would require—the focus is on the reader who is also trained in your field, with the suitable skills and knowledge to attempt a replication.

A constant principle of rigorous science

A methods section that enables other researchers to understand and replicate your results is a constant principle of rigorous, transparent, and Open Science. Aim to be thorough, even if a particular journal doesn’t require the same level of detail . Reproducibility is all of our responsibility. You cannot create any problems by exceeding a minimum standard of information. If a journal still has word-limits—either for the overall article or specific sections—and requires some methodological details to be in a supplemental section, that is OK as long as the extra details are searchable and findable .

Imagine replicating your own work, years in the future

As part of PLOS’ presentation on Reproducibility and Open Publishing (part of UCSF’s Reproducibility Series ) we recommend planning the level of detail in your methods section by imagining you are writing for your future self, replicating your own work. When you consider that you might be at a different institution, with different account logins, applications, resources, and access levels—you can help yourself imagine the level of specificity that you yourself would require to redo the exact experiment. Consider:

• Which details would you need to be reminded of? 
• Which cell line, or antibody, or software, or reagent did you use, and does it have a Research Resource ID (RRID) that you can cite?
• Which version of a questionnaire did you use in your survey? 
• Exactly which visual stimulus did you show participants, and is it publicly available? 
• What participants did you decide to exclude? 
• What process did you adjust, during your work? 

Tip: Be sure to capture any changes to your protocols

You yourself would want to know about any adjustments, if you ever replicate the work, so you can surmise that anyone else would want to as well. Even if a necessary adjustment you made was not ideal, transparency is the key to ensuring this is not regarded as an issue in the future. It is far better to transparently convey any non-optimal methods, or methodological constraints, than to conceal them, which could result in reproducibility or ethical issues downstream.

Visual aids for methods help when reading the whole paper

Consider whether a visual representation of your methods could be appropriate or aid understanding your process. A visual reference readers can easily return to, like a flow-diagram, decision-tree, or checklist, can help readers to better understand the complete article, not just the methods section.

Ethical Considerations

In addition to describing what you did, it is just as important to assure readers that you also followed all relevant ethical guidelines when conducting your research. While ethical standards and reporting guidelines are often presented in a separate section of a paper, ensure that your methods and protocols actually follow these guidelines. Read more about ethics .

Existing standards, checklists, guidelines, partners

While the level of detail contained in a methods section should be guided by the universal principles of rigorous science outlined above, various disciplines, fields, and projects have worked hard to design and develop consistent standards, guidelines, and tools to help with reporting all types of experiment. Below, you’ll find some of the key initiatives. Ensure you read the submission guidelines for the specific journal you are submitting to, in order to discover any further journal- or field-specific policies to follow, or initiatives/tools to utilize.

Tip: Keep your paper moving forward by providing the proper paperwork up front

Be sure to check the journal guidelines and provide the necessary documents with your manuscript submission. Collecting the necessary documentation can greatly slow the first round of peer review, or cause delays when you submit your revision.

Randomized Controlled Trials – CONSORT The Consolidated Standards of Reporting Trials (CONSORT) project covers various initiatives intended to prevent the problems of  inadequate reporting of randomized controlled trials. The primary initiative is an evidence-based minimum set of recommendations for reporting randomized trials known as the CONSORT Statement . 

Systematic Reviews and Meta-Analyses – PRISMA The Preferred Reporting Items for Systematic Reviews and Meta-Analyses ( PRISMA ) is an evidence-based minimum set of items focusing  on the reporting of  reviews evaluating randomized trials and other types of research.

Research using Animals – ARRIVE The Animal Research: Reporting of In Vivo Experiments ( ARRIVE ) guidelines encourage maximizing the information reported in research using animals thereby minimizing unnecessary studies. (Original study and proposal , and updated guidelines , in PLOS Biology .) 

Laboratory Protocols Protocols.io has developed a platform specifically for the sharing and updating of laboratory protocols , which are assigned their own DOI and can be linked from methods sections of papers to enhance reproducibility. Contextualize your protocol and improve discovery with an accompanying Lab Protocol article in PLOS ONE .

Consistent reporting of Materials, Design, and Analysis – the MDAR checklist A cross-publisher group of editors and experts have developed, tested, and rolled out a checklist to help establish and harmonize reporting standards in the Life Sciences . The checklist , which is available for use by authors to compile their methods, and editors/reviewers to check methods, establishes a minimum set of requirements in transparent reporting and is adaptable to any discipline within the Life Sciences, by covering a breadth of potentially relevant methodological items and considerations. If you are in the Life Sciences and writing up your methods section, try working through the MDAR checklist and see whether it helps you include all relevant details into your methods, and whether it reminded you of anything you might have missed otherwise.

Summary Writing tips

The main challenge you may find when writing your methods is keeping it readable AND covering all the details needed for reproducibility and replicability. While this is difficult, do not compromise on rigorous standards for credibility!

• Keep in mind future replicability, alongside understanding and readability.
• Follow checklists, and field- and journal-specific guidelines.
• Consider a commitment to rigorous and transparent science a personal responsibility, and not just adhering to journal guidelines.
• Establish whether there are persistent identifiers for any research resources you use that can be specifically cited in your methods section.
• Deposit your laboratory protocols in Protocols.io, establishing a permanent link to them. You can update your protocols later if you improve on them, as can future scientists who follow your protocols.
• Consider visual aids like flow-diagrams, lists, to help with reading other sections of the paper.
• Be specific about all decisions made during the experiments that someone reproducing your work would need to know.

Don’t

• Summarize or abbreviate methods without giving full details in a discoverable supplemental section.
• Presume you will always be able to remember how you performed the experiments, or have access to private or institutional notebooks and resources.
• Attempt to hide constraints or non-optimal decisions you had to make–transparency is the key to ensuring the credibility of your research.
• How to Write a Great Title
• How to Write an Abstract
• How to Report Statistics
• How to Write Discussions and Conclusions
• How to Edit Your Work

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How to write your first research paper.

Writing a research manuscript is an intimidating process for many novice writers in the sciences. One of the stumbling blocks is the beginning of the process and creating the first draft. This paper presents guidelines on how to initiate the writing process and draft each section of a research manuscript. The paper discusses seven rules that allow the writer to prepare a well-structured and comprehensive manuscript for a publication submission. In addition, the author lists different strategies for successful revision. Each of those strategies represents a step in the revision process and should help the writer improve the quality of the manuscript. The paper could be considered a brief manual for publication.

It is late at night. You have been struggling with your project for a year. You generated an enormous amount of interesting data. Your pipette feels like an extension of your hand, and running western blots has become part of your daily routine, similar to brushing your teeth. Your colleagues think you are ready to write a paper, and your lab mates tease you about your “slow” writing progress. Yet days pass, and you cannot force yourself to sit down to write. You have not written anything for a while (lab reports do not count), and you feel you have lost your stamina. How does the writing process work? How can you fit your writing into a daily schedule packed with experiments? What section should you start with? What distinguishes a good research paper from a bad one? How should you revise your paper? These and many other questions buzz in your head and keep you stressed. As a result, you procrastinate. In this paper, I will discuss the issues related to the writing process of a scientific paper. Specifically, I will focus on the best approaches to start a scientific paper, tips for writing each section, and the best revision strategies.

1. Schedule your writing time in Outlook

Whether you have written 100 papers or you are struggling with your first, starting the process is the most difficult part unless you have a rigid writing schedule. Writing is hard. It is a very difficult process of intense concentration and brain work. As stated in Hayes’ framework for the study of writing: “It is a generative activity requiring motivation, and it is an intellectual activity requiring cognitive processes and memory” [ 1 ]. In his book How to Write a Lot: A Practical Guide to Productive Academic Writing , Paul Silvia says that for some, “it’s easier to embalm the dead than to write an article about it” [ 2 ]. Just as with any type of hard work, you will not succeed unless you practice regularly. If you have not done physical exercises for a year, only regular workouts can get you into good shape again. The same kind of regular exercises, or I call them “writing sessions,” are required to be a productive author. Choose from 1- to 2-hour blocks in your daily work schedule and consider them as non-cancellable appointments. When figuring out which blocks of time will be set for writing, you should select the time that works best for this type of work. For many people, mornings are more productive. One Yale University graduate student spent a semester writing from 8 a.m. to 9 a.m. when her lab was empty. At the end of the semester, she was amazed at how much she accomplished without even interrupting her regular lab hours. In addition, doing the hardest task first thing in the morning contributes to the sense of accomplishment during the rest of the day. This positive feeling spills over into our work and life and has a very positive effect on our overall attitude.

Rule 1: Create regular time blocks for writing as appointments in your calendar and keep these appointments.

2. start with an outline.

Now that you have scheduled time, you need to decide how to start writing. The best strategy is to start with an outline. This will not be an outline that you are used to, with Roman numerals for each section and neat parallel listing of topic sentences and supporting points. This outline will be similar to a template for your paper. Initially, the outline will form a structure for your paper; it will help generate ideas and formulate hypotheses. Following the advice of George M. Whitesides, “. . . start with a blank piece of paper, and write down, in any order, all important ideas that occur to you concerning the paper” [ 3 ]. Use Table 1 as a starting point for your outline. Include your visuals (figures, tables, formulas, equations, and algorithms), and list your findings. These will constitute the first level of your outline, which will eventually expand as you elaborate.

The next stage is to add context and structure. Here you will group all your ideas into sections: Introduction, Methods, Results, and Discussion/Conclusion ( Table 2 ). This step will help add coherence to your work and sift your ideas.

Now that you have expanded your outline, you are ready for the next step: discussing the ideas for your paper with your colleagues and mentor. Many universities have a writing center where graduate students can schedule individual consultations and receive assistance with their paper drafts. Getting feedback during early stages of your draft can save a lot of time. Talking through ideas allows people to conceptualize and organize thoughts to find their direction without wasting time on unnecessary writing. Outlining is the most effective way of communicating your ideas and exchanging thoughts. Moreover, it is also the best stage to decide to which publication you will submit the paper. Many people come up with three choices and discuss them with their mentors and colleagues. Having a list of journal priorities can help you quickly resubmit your paper if your paper is rejected.

Rule 2: Create a detailed outline and discuss it with your mentor and peers.

3. continue with drafts.

After you get enough feedback and decide on the journal you will submit to, the process of real writing begins. Copy your outline into a separate file and expand on each of the points, adding data and elaborating on the details. When you create the first draft, do not succumb to the temptation of editing. Do not slow down to choose a better word or better phrase; do not halt to improve your sentence structure. Pour your ideas into the paper and leave revision and editing for later. As Paul Silvia explains, “Revising while you generate text is like drinking decaffeinated coffee in the early morning: noble idea, wrong time” [ 2 ].

Many students complain that they are not productive writers because they experience writer’s block. Staring at an empty screen is frustrating, but your screen is not really empty: You have a template of your article, and all you need to do is fill in the blanks. Indeed, writer’s block is a logical fallacy for a scientist ― it is just an excuse to procrastinate. When scientists start writing a research paper, they already have their files with data, lab notes with materials and experimental designs, some visuals, and tables with results. All they need to do is scrutinize these pieces and put them together into a comprehensive paper.

3.1. Starting with Materials and Methods

If you still struggle with starting a paper, then write the Materials and Methods section first. Since you have all your notes, it should not be problematic for you to describe the experimental design and procedures. Your most important goal in this section is to be as explicit as possible by providing enough detail and references. In the end, the purpose of this section is to allow other researchers to evaluate and repeat your work. So do not run into the same problems as the writers of the sentences in (1):

1a. Bacteria were pelleted by centrifugation. 1b. To isolate T cells, lymph nodes were collected.

As you can see, crucial pieces of information are missing: the speed of centrifuging your bacteria, the time, and the temperature in (1a); the source of lymph nodes for collection in (b). The sentences can be improved when information is added, as in (2a) and (2b), respectfully:

2a. Bacteria were pelleted by centrifugation at 3000g for 15 min at 25°C. 2b. To isolate T cells, mediastinal and mesenteric lymph nodes from Balb/c mice were collected at day 7 after immunization with ovabumin.

If your method has previously been published and is well-known, then you should provide only the literature reference, as in (3a). If your method is unpublished, then you need to make sure you provide all essential details, as in (3b).

3a. Stem cells were isolated, according to Johnson [23]. 3b. Stem cells were isolated using biotinylated carbon nanotubes coated with anti-CD34 antibodies.

Furthermore, cohesion and fluency are crucial in this section. One of the malpractices resulting in disrupted fluency is switching from passive voice to active and vice versa within the same paragraph, as shown in (4). This switching misleads and distracts the reader.

4. Behavioral computer-based experiments of Study 1 were programmed by using E-Prime. We took ratings of enjoyment, mood, and arousal as the patients listened to preferred pleasant music and unpreferred music by using Visual Analogue Scales (SI Methods). The preferred and unpreferred status of the music was operationalized along a continuum of pleasantness [ 4 ].

The problem with (4) is that the reader has to switch from the point of view of the experiment (passive voice) to the point of view of the experimenter (active voice). This switch causes confusion about the performer of the actions in the first and the third sentences. To improve the coherence and fluency of the paragraph above, you should be consistent in choosing the point of view: first person “we” or passive voice [ 5 ]. Let’s consider two revised examples in (5).

5a. We programmed behavioral computer-based experiments of Study 1 by using E-Prime. We took ratings of enjoyment, mood, and arousal by using Visual Analogue Scales (SI Methods) as the patients listened to preferred pleasant music and unpreferred music. We operationalized the preferred and unpreferred status of the music along a continuum of pleasantness. 5b. Behavioral computer-based experiments of Study 1 were programmed by using E-Prime. Ratings of enjoyment, mood, and arousal were taken as the patients listened to preferred pleasant music and unpreferred music by using Visual Analogue Scales (SI Methods). The preferred and unpreferred status of the music was operationalized along a continuum of pleasantness.

If you choose the point of view of the experimenter, then you may end up with repetitive “we did this” sentences. For many readers, paragraphs with sentences all beginning with “we” may also sound disruptive. So if you choose active sentences, you need to keep the number of “we” subjects to a minimum and vary the beginnings of the sentences [ 6 ].

Interestingly, recent studies have reported that the Materials and Methods section is the only section in research papers in which passive voice predominantly overrides the use of the active voice [ 5 , 7 , 8 , 9 ]. For example, Martínez shows a significant drop in active voice use in the Methods sections based on the corpus of 1 million words of experimental full text research articles in the biological sciences [ 7 ]. According to the author, the active voice patterned with “we” is used only as a tool to reveal personal responsibility for the procedural decisions in designing and performing experimental work. This means that while all other sections of the research paper use active voice, passive voice is still the most predominant in Materials and Methods sections.

Writing Materials and Methods sections is a meticulous and time consuming task requiring extreme accuracy and clarity. This is why when you complete your draft, you should ask for as much feedback from your colleagues as possible. Numerous readers of this section will help you identify the missing links and improve the technical style of this section.

Rule 3: Be meticulous and accurate in describing the Materials and Methods. Do not change the point of view within one paragraph.

3.2. writing results section.

For many authors, writing the Results section is more intimidating than writing the Materials and Methods section . If people are interested in your paper, they are interested in your results. That is why it is vital to use all your writing skills to objectively present your key findings in an orderly and logical sequence using illustrative materials and text.

Your Results should be organized into different segments or subsections where each one presents the purpose of the experiment, your experimental approach, data including text and visuals (tables, figures, schematics, algorithms, and formulas), and data commentary. For most journals, your data commentary will include a meaningful summary of the data presented in the visuals and an explanation of the most significant findings. This data presentation should not repeat the data in the visuals, but rather highlight the most important points. In the “standard” research paper approach, your Results section should exclude data interpretation, leaving it for the Discussion section. However, interpretations gradually and secretly creep into research papers: “Reducing the data, generalizing from the data, and highlighting scientific cases are all highly interpretive processes. It should be clear by now that we do not let the data speak for themselves in research reports; in summarizing our results, we interpret them for the reader” [ 10 ]. As a result, many journals including the Journal of Experimental Medicine and the Journal of Clinical Investigation use joint Results/Discussion sections, where results are immediately followed by interpretations.

Another important aspect of this section is to create a comprehensive and supported argument or a well-researched case. This means that you should be selective in presenting data and choose only those experimental details that are essential for your reader to understand your findings. You might have conducted an experiment 20 times and collected numerous records, but this does not mean that you should present all those records in your paper. You need to distinguish your results from your data and be able to discard excessive experimental details that could distract and confuse the reader. However, creating a picture or an argument should not be confused with data manipulation or falsification, which is a willful distortion of data and results. If some of your findings contradict your ideas, you have to mention this and find a plausible explanation for the contradiction.

In addition, your text should not include irrelevant and peripheral information, including overview sentences, as in (6).

6. To show our results, we first introduce all components of experimental system and then describe the outcome of infections.

Indeed, wordiness convolutes your sentences and conceals your ideas from readers. One common source of wordiness is unnecessary intensifiers. Adverbial intensifiers such as “clearly,” “essential,” “quite,” “basically,” “rather,” “fairly,” “really,” and “virtually” not only add verbosity to your sentences, but also lower your results’ credibility. They appeal to the reader’s emotions but lower objectivity, as in the common examples in (7):

7a. Table 3 clearly shows that … 7b. It is obvious from figure 4 that …

Another source of wordiness is nominalizations, i.e., nouns derived from verbs and adjectives paired with weak verbs including “be,” “have,” “do,” “make,” “cause,” “provide,” and “get” and constructions such as “there is/are.”

8a. We tested the hypothesis that there is a disruption of membrane asymmetry. 8b. In this paper we provide an argument that stem cells repopulate injured organs.

In the sentences above, the abstract nominalizations “disruption” and “argument” do not contribute to the clarity of the sentences, but rather clutter them with useless vocabulary that distracts from the meaning. To improve your sentences, avoid unnecessary nominalizations and change passive verbs and constructions into active and direct sentences.

9a. We tested the hypothesis that the membrane asymmetry is disrupted. 9b. In this paper we argue that stem cells repopulate injured organs.

Your Results section is the heart of your paper, representing a year or more of your daily research. So lead your reader through your story by writing direct, concise, and clear sentences.

Rule 4: Be clear, concise, and objective in describing your Results.

3.3. now it is time for your introduction.

Now that you are almost half through drafting your research paper, it is time to update your outline. While describing your Methods and Results, many of you diverged from the original outline and re-focused your ideas. So before you move on to create your Introduction, re-read your Methods and Results sections and change your outline to match your research focus. The updated outline will help you review the general picture of your paper, the topic, the main idea, and the purpose, which are all important for writing your introduction.

The best way to structure your introduction is to follow the three-move approach shown in Table 3 .

Adapted from Swales and Feak [ 11 ].

The moves and information from your outline can help to create your Introduction efficiently and without missing steps. These moves are traffic signs that lead the reader through the road of your ideas. Each move plays an important role in your paper and should be presented with deep thought and care. When you establish the territory, you place your research in context and highlight the importance of your research topic. By finding the niche, you outline the scope of your research problem and enter the scientific dialogue. The final move, “occupying the niche,” is where you explain your research in a nutshell and highlight your paper’s significance. The three moves allow your readers to evaluate their interest in your paper and play a significant role in the paper review process, determining your paper reviewers.

Some academic writers assume that the reader “should follow the paper” to find the answers about your methodology and your findings. As a result, many novice writers do not present their experimental approach and the major findings, wrongly believing that the reader will locate the necessary information later while reading the subsequent sections [ 5 ]. However, this “suspense” approach is not appropriate for scientific writing. To interest the reader, scientific authors should be direct and straightforward and present informative one-sentence summaries of the results and the approach.

Another problem is that writers understate the significance of the Introduction. Many new researchers mistakenly think that all their readers understand the importance of the research question and omit this part. However, this assumption is faulty because the purpose of the section is not to evaluate the importance of the research question in general. The goal is to present the importance of your research contribution and your findings. Therefore, you should be explicit and clear in describing the benefit of the paper.

The Introduction should not be long. Indeed, for most journals, this is a very brief section of about 250 to 600 words, but it might be the most difficult section due to its importance.

Rule 5: Interest your reader in the Introduction section by signalling all its elements and stating the novelty of the work.

3.4. discussion of the results.

For many scientists, writing a Discussion section is as scary as starting a paper. Most of the fear comes from the variation in the section. Since every paper has its unique results and findings, the Discussion section differs in its length, shape, and structure. However, some general principles of writing this section still exist. Knowing these rules, or “moves,” can change your attitude about this section and help you create a comprehensive interpretation of your results.

The purpose of the Discussion section is to place your findings in the research context and “to explain the meaning of the findings and why they are important, without appearing arrogant, condescending, or patronizing” [ 11 ]. The structure of the first two moves is almost a mirror reflection of the one in the Introduction. In the Introduction, you zoom in from general to specific and from the background to your research question; in the Discussion section, you zoom out from the summary of your findings to the research context, as shown in Table 4 .

Adapted from Swales and Feak and Hess [ 11 , 12 ].

The biggest challenge for many writers is the opening paragraph of the Discussion section. Following the moves in Table 1 , the best choice is to start with the study’s major findings that provide the answer to the research question in your Introduction. The most common starting phrases are “Our findings demonstrate . . .,” or “In this study, we have shown that . . .,” or “Our results suggest . . .” In some cases, however, reminding the reader about the research question or even providing a brief context and then stating the answer would make more sense. This is important in those cases where the researcher presents a number of findings or where more than one research question was presented. Your summary of the study’s major findings should be followed by your presentation of the importance of these findings. One of the most frequent mistakes of the novice writer is to assume the importance of his findings. Even if the importance is clear to you, it may not be obvious to your reader. Digesting the findings and their importance to your reader is as crucial as stating your research question.

Another useful strategy is to be proactive in the first move by predicting and commenting on the alternative explanations of the results. Addressing potential doubts will save you from painful comments about the wrong interpretation of your results and will present you as a thoughtful and considerate researcher. Moreover, the evaluation of the alternative explanations might help you create a logical step to the next move of the discussion section: the research context.

The goal of the research context move is to show how your findings fit into the general picture of the current research and how you contribute to the existing knowledge on the topic. This is also the place to discuss any discrepancies and unexpected findings that may otherwise distort the general picture of your paper. Moreover, outlining the scope of your research by showing the limitations, weaknesses, and assumptions is essential and adds modesty to your image as a scientist. However, make sure that you do not end your paper with the problems that override your findings. Try to suggest feasible explanations and solutions.

If your submission does not require a separate Conclusion section, then adding another paragraph about the “take-home message” is a must. This should be a general statement reiterating your answer to the research question and adding its scientific implications, practical application, or advice.

Just as in all other sections of your paper, the clear and precise language and concise comprehensive sentences are vital. However, in addition to that, your writing should convey confidence and authority. The easiest way to illustrate your tone is to use the active voice and the first person pronouns. Accompanied by clarity and succinctness, these tools are the best to convince your readers of your point and your ideas.

Rule 6: Present the principles, relationships, and generalizations in a concise and convincing tone.

4. choosing the best working revision strategies.

Now that you have created the first draft, your attitude toward your writing should have improved. Moreover, you should feel more confident that you are able to accomplish your project and submit your paper within a reasonable timeframe. You also have worked out your writing schedule and followed it precisely. Do not stop ― you are only at the midpoint from your destination. Just as the best and most precious diamond is no more than an unattractive stone recognized only by trained professionals, your ideas and your results may go unnoticed if they are not polished and brushed. Despite your attempts to present your ideas in a logical and comprehensive way, first drafts are frequently a mess. Use the advice of Paul Silvia: “Your first drafts should sound like they were hastily translated from Icelandic by a non-native speaker” [ 2 ]. The degree of your success will depend on how you are able to revise and edit your paper.

The revision can be done at the macrostructure and the microstructure levels [ 13 ]. The macrostructure revision includes the revision of the organization, content, and flow. The microstructure level includes individual words, sentence structure, grammar, punctuation, and spelling.

The best way to approach the macrostructure revision is through the outline of the ideas in your paper. The last time you updated your outline was before writing the Introduction and the Discussion. Now that you have the beginning and the conclusion, you can take a bird’s-eye view of the whole paper. The outline will allow you to see if the ideas of your paper are coherently structured, if your results are logically built, and if the discussion is linked to the research question in the Introduction. You will be able to see if something is missing in any of the sections or if you need to rearrange your information to make your point.

The next step is to revise each of the sections starting from the beginning. Ideally, you should limit yourself to working on small sections of about five pages at a time [ 14 ]. After these short sections, your eyes get used to your writing and your efficiency in spotting problems decreases. When reading for content and organization, you should control your urge to edit your paper for sentence structure and grammar and focus only on the flow of your ideas and logic of your presentation. Experienced researchers tend to make almost three times the number of changes to meaning than novice writers [ 15 , 16 ]. Revising is a difficult but useful skill, which academic writers obtain with years of practice.

In contrast to the macrostructure revision, which is a linear process and is done usually through a detailed outline and by sections, microstructure revision is a non-linear process. While the goal of the macrostructure revision is to analyze your ideas and their logic, the goal of the microstructure editing is to scrutinize the form of your ideas: your paragraphs, sentences, and words. You do not need and are not recommended to follow the order of the paper to perform this type of revision. You can start from the end or from different sections. You can even revise by reading sentences backward, sentence by sentence and word by word.

One of the microstructure revision strategies frequently used during writing center consultations is to read the paper aloud [ 17 ]. You may read aloud to yourself, to a tape recorder, or to a colleague or friend. When reading and listening to your paper, you are more likely to notice the places where the fluency is disrupted and where you stumble because of a very long and unclear sentence or a wrong connector.

Another revision strategy is to learn your common errors and to do a targeted search for them [ 13 ]. All writers have a set of problems that are specific to them, i.e., their writing idiosyncrasies. Remembering these problems is as important for an academic writer as remembering your friends’ birthdays. Create a list of these idiosyncrasies and run a search for these problems using your word processor. If your problem is demonstrative pronouns without summary words, then search for “this/these/those” in your text and check if you used the word appropriately. If you have a problem with intensifiers, then search for “really” or “very” and delete them from the text. The same targeted search can be done to eliminate wordiness. Searching for “there is/are” or “and” can help you avoid the bulky sentences.

The final strategy is working with a hard copy and a pencil. Print a double space copy with font size 14 and re-read your paper in several steps. Try reading your paper line by line with the rest of the text covered with a piece of paper. When you are forced to see only a small portion of your writing, you are less likely to get distracted and are more likely to notice problems. You will end up spotting more unnecessary words, wrongly worded phrases, or unparallel constructions.

After you apply all these strategies, you are ready to share your writing with your friends, colleagues, and a writing advisor in the writing center. Get as much feedback as you can, especially from non-specialists in your field. Patiently listen to what others say to you ― you are not expected to defend your writing or explain what you wanted to say. You may decide what you want to change and how after you receive the feedback and sort it in your head. Even though some researchers make the revision an endless process and can hardly stop after a 14th draft; having from five to seven drafts of your paper is a norm in the sciences. If you can’t stop revising, then set a deadline for yourself and stick to it. Deadlines always help.

Rule 7: Revise your paper at the macrostructure and the microstructure level using different strategies and techniques. Receive feedback and revise again.

5. it is time to submit.

It is late at night again. You are still in your lab finishing revisions and getting ready to submit your paper. You feel happy ― you have finally finished a year’s worth of work. You will submit your paper tomorrow, and regardless of the outcome, you know that you can do it. If one journal does not take your paper, you will take advantage of the feedback and resubmit again. You will have a publication, and this is the most important achievement.

What is even more important is that you have your scheduled writing time that you are going to keep for your future publications, for reading and taking notes, for writing grants, and for reviewing papers. You are not going to lose stamina this time, and you will become a productive scientist. But for now, let’s celebrate the end of the paper.

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Research Paper Writing: 5. Methods / Materials

• 1. Getting Started
• 2. Abstract
• 3. Introduction
• 4. Literature Review
• 5. Methods / Materials
• 6. Results / Analysis
• 7. Discussion
• 8. Conclusion
• 9. Reference

Methods / Materials Overview

These sections of the research paper should be concise. The audience reading the paper will always want to know what materials or methods that were used. The methods and materials may be under subheadings in the section or incorporated together. The main objective for these sections is to provide specialized materials, general procedures, and methods to judge the scientific value of the paper.

What to include in the sections

• Described separately
• Include the chemicals, biological, and any equipment
• Do not include common supplies, such as test tubes, pipette tips, beakers, etc. or standard lab equipment
• Single out sources like a specific type of equipment, enzyme, or a culture
• These should be mentioned in a separate paragraph with its own heading or highlighted in the procedure section if there is one
• Refer to solutions by name and describe
• Describes in detail how the analysis was conducted
• Be brief when presenting methods under the title devoted to a specific technique or groups of procedures
• Simplify and report what the procedure was
• Report the method by name
• Use third person passive voice, and avoid using first person
• Use normal text in these sections
• Avoid informal lists
• Use complete sentences

Example of a Methods Section

Publication Manual of the American Psychological Association Sixth Ed. 2010

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Materials and Methods Examples and Writing Tips

Abstract | Introduction | Literature Review | Research question | Materials & Methods | Results | Discussion | Conclusion

In this blog, we look at how to write the materials and methods section of a research paper. In most research papers, the materials and methods section follows the literature review section. This is generally the easiest section to write because you are simply reproducing what you did in your experiments. It is always a good idea to start writing your research paper with the materials and methods section.

1. What is the purpose of the materials and methods section?

Materials and methods should describe how you did your research and detail the experimental procedure. One of the most important things to bear in mind while writing the materials and methods section is that it should have enough detail so that other researchers in your field can replicate your experiments and reproduce your results.  You should provide all the steps in a logical order so that your readers can follow your description easily.

2. Materials and Methods Examples

The structure of the methods section will very much depend on your discipline. If you are not sure about the structure, then the best place to start will be to go through the methods section of some previously published papers from your chosen journal. We will look at some examples of materials and methods structure in different disciplines. 

2.1. Materials & methods example #1 (Engineering paper)

If you are writing an engineering sciences research paper in which you are introducing a new method, your materials and methods section would typically include the following information.

You can start with the top-level summary of the method. You can try to answer these questions. Are you proposing a new method? Or,  Are you using a standard method from the literature?  Or, Are you extending a previously published method? If so, is it your previous work? or work published by a different author?

Then you can talk about the reasons for choosing this method. You can quote previous papers that have used this method successfully to support your arguments. Then, you can talk about the actual implementation details of the methods.

Then you can talk about how the methods were validated to confirm that they are suitable for your research. You can also include information about any pilot or preliminary studies you conducted before the full study. Then you can explain how you propose to test and evaluate the methods to prove that they are better than the existing methods. Here, you can talk about metrics and statistical tests you will be using to evaluate your method.

2.2. Materials & methods example #2 (Measurement paper)

If you are writing a paper that deals with measurements, you would typically include the following information in your materials and methods section.

You can start by talking about the experimental setup. You can try to answer these questions. What equipment was used to perform the measurements? What was the make and the model of the equipment?  How many technicians took the measurements?  How experienced were the technicians?

Then you can talk about the parameters that were measured during the experiment. Then you can talk about the actual measurement procedure. How were the samples prepared for the measurements?  How many measurements were taken? Were the measurements repeated for consistency? Was there a time interval between successive measurements?

Then you can talk about measurement conditions and constraints. Were the measurements performed at room temperature or under special conditions? Were there any practical difficulties while performing the measurements, if so, how did you overcome them?

Most importantly, you must list all the calculations in the form of detailed equations and formulas so that readers know exactly how the data was produced.

2.3. Materials & methods example #3 (Survey questionnaire paper)

If you are writing a survey questionnaire paper , you would typically include the following information in your materials and methods section.

You can start by talking about your participants. Who is your target population? What are their demographics? How did you recruit them?  How did participants provide consent for your study? What sampling method did you use to select the participants?

Then you can talk about the survey type. Was it a phone interview? Was it a personal interview? Was it an online survey? Or, Was it a written survey?

Then you can talk about the questionnaire design. How did you choose the questions? How many questions were there? What type of questions were they? Were they open ended questions, or close ended questions, or rating scale questions, or a mixture of different types of questions?

Then you can talk about how the questionnaire was administered. If it is an online survey, how did you get the questionnaire to the participants? Did you email them? Or did you post the survey forms?

If you are doing a personal interview. How did you conduct the interviews? Was it one to one interview, or was it done in batches, or did you use focus groups? How did the participants behave during the interview?

Then you can talk about questionnaire testing. Did you test your questionnaire before the main study? Did you have to make any changes after initial testing?  Did you have to translate the questionnaire into multiple languages? Then finally you can talk about different types of statistical tests you used to analyze the survey responses.

2.4. Materials & methods example #4 (Medical clinical trial paper)

If you are writing a medical research paper , your materials and methods section would typically include the following information.

You can start by providing information about the study design. Was it a randomized trial, or an observational trial? Was it a prospective study, or a retrospective study? Was the study double-blinded, or single-blinded?

Then, you can talk about how the ethical approval was obtained for the study and clarify if the clinical trial was registered. if so, then provide the registration number.

Then, you can talk about how the participants were recruited for the study, and explain the inclusion and exclusion criteria. Then, you can talk about how the participants were grouped into control and placebo groups, and explain how the medication was administered.

Then, you can talk about what outcomes were measured. What was the primary outcome? What was the secondary outcome? What was the follow up period? You can try to answer these questions. Then you can finish off with some information about the statistical tests you used to analyze the data.

3. Frequently Asked Questions

One of the common mistakes people make is using vague language in materials and methods. Reviewers won’t like it, and they will reject the paper on the basis that the section is not elaborate enough for other researchers to reproduce your experiments.

Make sure you write the materials and methods section in past tense, since you are reporting something that has already happened.

Acronyms & Abbrevations: Try to use acronyms and abbreviations for long method names. Abbreviations and acronyms are a great way to make your writing concise and save time. Define the acronyms and abbreviations during their first occurrence then use the short form in the rest of the text. The common practice is to put the acronym and abbreviations in parentheses after the full term.

Use different layouts: Another problem you are likely to face is that your methods section can sound like manual if you have too much text in it. In particular, if you are dealing with a very complex procedure, the readers might find it dry and tedious. So try to provide some variety to the layout. Try to use bullet points and numberings instead of long paragraphs to make it easy for the readers to understand the procedure. You can use flow diagrams to illustrate the process rather than describing it.

When you are using a standard method that is well described in literature, the standard practice is to reference the paper rather than repeating the entire procedure. You can also provide a brief summary of the procedure in your own words.

For example, you can say something like this, “The details of the procedure have been reported previously in…”, and reference the previous paper. And then, you can follow it up with a brief summary of the method from the previous paper.

If you are extending a previous method, then you can do something like this. You can say that, “Some minor modifications were made to the method described in…” and reference the previous paper.  And then, you can follow it up with the list of refinements you made to the previous method in order to adapt it to your work.

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How to Write an APA Research Paper

Psychology/neuroscience 201, v iew in pdf format.

An APA-style paper includes the following sections: title page, abstract, introduction, method, results, discussion, and references. Your paper may also include one or more tables and/or figures. Different types of information about your study are addressed in each of the sections, as described below.

General formatting rules are as follows:

Do not put page breaks in between the introduction, method, results, and discussion sections.

The title page, abstract, references, table(s), and figure(s) should be on their own pages. The entire paper should be written in the past tense, in a 12-point font, double-spaced, and with one-inch margins all around.

(see sample on p. 41 of APA manual)

• Title should be between 10-12 words and should reflect content of paper (e.g., IV and DV).
• Title, your name, and Hamilton College are all double-spaced (no extra spaces)
• Create a page header using the “View header” function in MS Word. On the title page, the header should include the following: Flush left: Running head: THE RUNNING HEAD SHOULD BE IN ALL CAPITAL LETTERS. The running head is a short title that appears at the top of pages of published articles. It should not exceed 50 characters, including punctuation and spacing. (Note: on the title page, you actually write the words “Running head,” but these words do not appear on subsequent pages; just the actual running head does. If you make a section break between the title page and the rest of the paper you can make the header different for those two parts of the manuscript). Flush right, on same line: page number. Use the toolbox to insert a page number, so it will automatically number each page.

Abstract (labeled, centered, not bold)

No more than 120 words, one paragraph, block format (i.e., don’t indent), double-spaced.

• State topic, preferably in one sentence. Provide overview of method, results, and discussion.

Introduction

(Do not label as “Introduction.” Title of paper goes at the top of the page—not bold)

The introduction of an APA-style paper is the most difficult to write. A good introduction will summarize, integrate, and critically evaluate the empirical knowledge in the relevant area(s) in a way that sets the stage for your study and why you conducted it. The introduction starts out broad (but not too broad!) and gets more focused toward the end. Here are some guidelines for constructing a good introduction:

• Don’t put your readers to sleep by beginning your paper with the time-worn sentence, “Past research has shown (blah blah blah)” They’ll be snoring within a paragraph!  Try to draw your reader in by saying something interesting or thought-provoking right off the bat.  Take a look at articles you’ve read. Which ones captured your attention right away? How did the authors accomplish this task? Which ones didn’t?  Why not?  See if you can use articles you liked as a model. One way to begin (but not the only way) is to provide an example or anecdote illustrative of your topic area.
• Although you won’t go into the details of your study and hypotheses until the end of the intro, you should foreshadow your study a bit at the end of the first paragraph by stating your purpose briefly, to give your reader a schema for all the information you will present next.
• Your intro should be a logical flow of ideas that leads up to your hypothesis. Try to organize it in terms of the ideas rather than who did what when. In other words, your intro shouldn’t read like a story of “Schmirdley did such-and-such in 1991. Then Gurglehoff did something-or-other in 1993.  Then....(etc.)” First, brainstorm all of the ideas you think are necessary to include in your paper. Next, decide which ideas make sense to present first, second, third, and so forth, and think about how you want to transition between ideas. When an idea is complex, don’t be afraid to use a real-life example to clarify it for your reader. The introduction will end with a brief overview of your study and, finally, your specific hypotheses. The hypotheses should flow logically out of everything that’s been presented, so that the reader has the sense of, “Of course. This hypothesis makes complete sense, given all the other research that was presented.”
• When incorporating references into your intro, you do not necessarily need to describe every single study in complete detail, particularly if different studies use similar methodologies. Certainly you want to summarize briefly key articles, though, and point out differences in methods or findings of relevant studies when necessary. Don’t make one mistake typical of a novice APA-paper writer by stating overtly why you’re including a particular article (e.g., “This article is relevant to my study because…”). It should be obvious to the reader why you’re including a reference without your explicitly saying so.  DO NOT quote from the articles, instead paraphrase by putting the information in your own words.
• Be careful about citing your sources (see APA manual). Make sure there is a one-to-one correspondence between the articles you’ve cited in your intro and the articles listed in your reference section.
• Remember that your audience is the broader scientific community, not the other students in your class or your professor.  Therefore, you should assume they have a basic understanding of psychology, but you need to provide them with the complete information necessary for them to understand the research you are presenting.

Method (labeled, centered, bold)

The Method section of an APA-style paper is the most straightforward to write, but requires precision. Your goal is to describe the details of your study in such a way that another researcher could duplicate your methods exactly.

The Method section typically includes Participants, Materials and/or Apparatus, and Procedure sections. If the design is particularly complicated (multiple IVs in a factorial experiment, for example), you might also include a separate Design subsection or have a “Design and Procedure” section.

Note that in some studies (e.g., questionnaire studies in which there are many measures to describe but the procedure is brief), it may be more useful to present the Procedure section prior to the Materials section rather than after it.

Participants (labeled, flush left, bold)

Total number of participants (# women, # men), age range, mean and SD for age, racial/ethnic composition (if applicable), population type (e.g., college students). Remember to write numbers out when they begin a sentence.

• How were the participants recruited? (Don’t say “randomly” if it wasn’t random!) Were they compensated for their time in any way? (e.g., money, extra credit points)
• Write for a broad audience. Thus, do not write, “Students in Psych. 280...” Rather, write (for instance), “Students in a psychological statistics and research methods course at a small liberal arts college….”
• Try to avoid short, choppy sentences. Combine information into a longer sentence when possible.

Materials (labeled, flush left, bold)

Carefully describe any stimuli, questionnaires, and so forth. It is unnecessary to mention things such as the paper and pencil used to record the responses, the data recording sheet, the computer that ran the data analysis, the color of the computer, and so forth.

• If you included a questionnaire, you should describe it in detail. For instance, note how many items were on the questionnaire, what the response format was (e.g., a 5-point Likert-type scale ranging from 1 (strongly disagree) to 5 (strongly agree)), how many items were reverse-scored, whether the measure had subscales, and so forth. Provide a sample item or two for your reader.
• If you have created a new instrument, you should attach it as an Appendix.
• If you presented participants with various word lists to remember or stimuli to judge, you should describe those in detail here. Use subheadings to separate different types of stimuli if needed.  If you are only describing questionnaires, you may call this section “Measures.”

Apparatus (labeled, flush left, bold)

Include an apparatus section if you used specialized equipment for your study (e.g., the eye tracking machine) and need to describe it in detail.

Procedure (labeled, flush left, bold)

What did participants do, and in what order? When you list a control variable (e.g., “Participants all sat two feet from the experimenter.”), explain WHY you did what you did.  In other words, what nuisance variable were you controlling for? Your procedure should be as brief and concise as possible. Read through it. Did you repeat yourself anywhere? If so, how can you rearrange things to avoid redundancy? You may either write the instructions to the participants verbatim or paraphrase, whichever you deem more appropriate. Don’t forget to include brief statements about informed consent and debriefing.

Results (labeled, centered, bold)

In this section, describe how you analyzed the data and what you found. If your data analyses were complex, feel free to break this section down into labeled subsections, perhaps one section for each hypothesis.

• Include a section for descriptive statistics
• List what type of analysis or test you conducted to test each hypothesis.
• Refer to your Statistics textbook for the proper way to report results in APA style. A t-test, for example, is reported in the following format: t (18) = 3.57, p < .001, where 18 is the number of degrees of freedom (N – 2 for an independent-groups t test). For a correlation: r (32) = -.52, p < .001, where 32 is the number of degrees of freedom (N – 2 for a correlation). For a one-way ANOVA: F (2, 18) = 7.00, p < .001, where 2 represents the between and 18 represents df within Remember that if a finding has a p value greater than .05, it is “nonsignificant,” not “insignificant.” For nonsignificant findings, still provide the exact p values. For correlations, be sure to report the r 2 value as an assessment of the strength of the finding, to show what proportion of variability is shared by the two variables you’re correlating. For t- tests and ANOVAs, report eta 2 .
• Report exact p values to two or three decimal places (e.g., p = .042; see p. 114 of APA manual).  However, for p-values less than .001, simply put p < .001.
• Following the presentation of all the statistics and numbers, be sure to state the nature of your finding(s) in words and whether or not they support your hypothesis (e.g., “As predicted …”). This information can typically be presented in a sentence or two following the numbers (within the same paragraph). Also, be sure to include the relevant means and SDs.
• It may be useful to include a table or figure to represent your results visually. Be sure to refer to these in your paper (e.g., “As illustrated in Figure 1…”). Remember that you may present a set of findings either as a table or as a figure, but not as both. Make sure that your text is not redundant with your tables/figures. For instance, if you present a table of means and standard deviations, you do not need to also report these in the text. However, if you use a figure to represent your results, you may wish to report means and standard deviations in the text, as these may not always be precisely ascertained by examining the figure. Do describe the trends shown in the figure.
• Do not spend any time interpreting or explaining the results; save that for the Discussion section.

Discussion (labeled, centered, bold)

The goal of the discussion section is to interpret your findings and place them in the broader context of the literature in the area. A discussion section is like the reverse of the introduction, in that you begin with the specifics and work toward the more general (funnel out). Some points to consider:

• Begin with a brief restatement of your main findings (using words, not numbers). Did they support the hypothesis or not? If not, why not, do you think? Were there any surprising or interesting findings? How do your findings tie into the existing literature on the topic, or extend previous research? What do the results say about the broader behavior under investigation? Bring back some of the literature you discussed in the Introduction, and show how your results fit in (or don’t fit in, as the case may be). If you have surprising findings, you might discuss other theories that can help to explain the findings. Begin with the assumption that your results are valid, and explain why they might differ from others in the literature.
• What are the limitations of the study? If your findings differ from those of other researchers, or if you did not get statistically significant results, don’t spend pages and pages detailing what might have gone wrong with your study, but do provide one or two suggestions. Perhaps these could be incorporated into the future research section, below.
• What additional questions were generated from this study? What further research should be conducted on the topic? What gaps are there in the current body of research? Whenever you present an idea for a future research study, be sure to explain why you think that particular study should be conducted. What new knowledge would be gained from it?  Don’t just say, “I think it would be interesting to re-run the study on a different college campus” or “It would be better to run the study again with more participants.” Really put some thought into what extensions of the research might be interesting/informative, and why.
• What are the theoretical and/or practical implications of your findings? How do these results relate to larger issues of human thoughts, feelings, and behavior? Give your readers “the big picture.” Try to answer the question, “So what?

Final paragraph: Be sure to sum up your paper with a final concluding statement. Don’t just trail off with an idea for a future study. End on a positive note by reminding your reader why your study was important and what it added to the literature.

References (labeled, centered, not bold)

Provide an alphabetical listing of the references (alphabetize by last name of first author). Double-space all, with no extra spaces between references. The second line of each reference should be indented (this is called a hanging indent and is easily accomplished using the ruler in Microsoft Word). See the APA manual for how to format references correctly.

Examples of references to journal articles start on p. 198 of the manual, and examples of references to books and book chapters start on pp. 202. Digital object identifiers (DOIs) are now included for electronic sources (see pp. 187-192 of APA manual to learn more).

Journal article example: [Note that only the first letter of the first word of the article title is capitalized; the journal name and volume are italicized. If the journal name had multiple words, each of the major words would be capitalized.] 

Ebner-Priemer, U. W., & Trull, T. J. (2009). Ecological momentary assessment of mood disorders and mood dysregulation. Psychological Assessment, 21, 463-475. doi:10.1037/a0017075

Book chapter example: [Note that only the first letter of the first word of both the chapter title and book title are capitalized.]

Stephan, W. G. (1985). Intergroup relations. In G. Lindzey & E. Aronson (Eds.), The handbook of social psychology (3 rd ed., Vol. 2, pp. 599-658). New York: Random House.

Book example: Gray, P. (2010). Psychology (6 th ed.). New York: Worth

Table There are various formats for tables, depending upon the information you wish to include. See the APA manual. Be sure to provide a table number and table title (the latter is italicized). Tables can be single or double-spaced.

Figure If you have more than one figure, each one gets its own page. Use a sans serif font, such as Helvetica, for any text within your figure. Be sure to label your x- and y-axes clearly, and make sure you’ve noted the units of measurement of the DV. Underneath the figure provide a label and brief caption (e.g., “Figure 1. Mean evaluation of job applicant qualifications as a function of applicant attractiveness level”). The figure caption typically includes the IVs/predictor variables and the DV. Include error bars in your bar graphs, and note what the bars represent in the figure caption: Error bars represent one standard error above and below the mean.

In-Text Citations: (see pp. 174-179 of APA manual) When citing sources in your paper, you need to include the authors’ names and publication date.

You should use the following formats:

• When including the citation as part of the sentence, use AND: “According to Jones and Smith (2003), the…”
• When the citation appears in parentheses, use “&”: “Studies have shown that priming can affect actual motor behavior (Jones & Smith, 2003; Klein, Bailey, & Hammer, 1999).” The studies appearing in parentheses should be ordered alphabetically by the first author’s last name, and should be separated by semicolons.
• If you are quoting directly (which you should avoid), you also need to include the page number.
• For sources with three or more authors, once you have listed all the authors’ names, you may write “et al.” on subsequent mentions. For example: “Klein et al. (1999) found that….” For sources with two authors, both authors must be included every time the source is cited. When a source has six or more authors, the first author’s last name and “et al.” are used every time the source is cited (including the first time). 

Secondary Sources

“Secondary source” is the term used to describe material that is cited in another source. If in his article entitled “Behavioral Study of Obedience” (1963), Stanley Milgram makes reference to the ideas of Snow (presented above), Snow (1961) is the primary source, and Milgram (1963) is the secondary source.

Try to avoid using secondary sources in your papers; in other words, try to find the primary source and read it before citing it in your own work. If you must use a secondary source, however, you should cite it in the following way:

Snow (as cited in Milgram, 1963) argued that, historically, the cause of most criminal acts... The reference for the Milgram article (but not the Snow reference) should then appear in the reference list at the end of your paper.

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How to Write a Methods Section for a Psychology Paper

Tips and Examples of an APA Methods Section

Kendra Cherry, MS, is a psychosocial rehabilitation specialist, psychology educator, and author of the "Everything Psychology Book."

Emily is a board-certified science editor who has worked with top digital publishing brands like Voices for Biodiversity, Study.com, GoodTherapy, Vox, and Verywell.

Verywell / Brianna Gilmartin 

The methods section of an APA format psychology paper provides the methods and procedures used in a research study or experiment . This part of an APA paper is critical because it allows other researchers to see exactly how you conducted your research.

Method refers to the procedure that was used in a research study. It included a precise description of how the experiments were performed and why particular procedures were selected. While the APA technically refers to this section as the 'method section,' it is also often known as a 'methods section.'

The methods section ensures the experiment's reproducibility and the assessment of alternative methods that might produce different results. It also allows researchers to replicate the experiment and judge the study's validity.

This article discusses how to write a methods section for a psychology paper, including important elements to include and tips that can help.

What to Include in a Method Section

So what exactly do you need to include when writing your method section? You should provide detailed information on the following:

• Research design
• Participants
• Participant behavior

The method section should provide enough information to allow other researchers to replicate your experiment or study.

Components of a Method Section

The method section should utilize subheadings to divide up different subsections. These subsections typically include participants, materials, design, and procedure.

Participants 

In this part of the method section, you should describe the participants in your experiment, including who they were (and any unique features that set them apart from the general population), how many there were, and how they were selected. If you utilized random selection to choose your participants, it should be noted here.

For example: "We randomly selected 100 children from elementary schools near the University of Arizona."

At the very minimum, this part of your method section must convey:

• Basic demographic characteristics of your participants (such as sex, age, ethnicity, or religion)
• The population from which your participants were drawn
• Any restrictions on your pool of participants
• How many participants were assigned to each condition and how they were assigned to each group (i.e., randomly assignment , another selection method, etc.)
• Why participants took part in your research (i.e., the study was advertised at a college or hospital, they received some type of incentive, etc.)

Information about participants helps other researchers understand how your study was performed, how generalizable the result might be, and allows other researchers to replicate the experiment with other populations to see if they might obtain the same results.

In this part of the method section, you should describe the materials, measures, equipment, or stimuli used in the experiment. This may include:

• Testing instruments
• Technical equipment
• Any psychological assessments that were used
• Any special equipment that was used

For example: "Two stories from Sullivan et al.'s (1994) second-order false belief attribution tasks were used to assess children's understanding of second-order beliefs."

For standard equipment such as computers, televisions, and videos, you can simply name the device and not provide further explanation.

Specialized equipment should be given greater detail, especially if it is complex or created for a niche purpose. In some instances, such as if you created a special material or apparatus for your study, you might need to include an illustration of the item in the appendix of your paper.

In this part of your method section, describe the type of design used in the experiment. Specify the variables as well as the levels of these variables. Identify:

• The independent variables
• Dependent variables
• Control variables
• Any extraneous variables that might influence your results.

Also, explain whether your experiment uses a  within-groups  or between-groups design.

For example: "The experiment used a 3x2 between-subjects design. The independent variables were age and understanding of second-order beliefs."

The next part of your method section should detail the procedures used in your experiment. Your procedures should explain:

• What the participants did
• How data was collected
• The order in which steps occurred

For example: "An examiner interviewed children individually at their school in one session that lasted 20 minutes on average. The examiner explained to each child that he or she would be told two short stories and that some questions would be asked after each story. All sessions were videotaped so the data could later be coded."

Keep this subsection concise yet detailed. Explain what you did and how you did it, but do not overwhelm your readers with too much information.

Tips for How to Write a Methods Section

In addition to following the basic structure of an APA method section, there are also certain things you should remember when writing this section of your paper. Consider the following tips when writing this section:

• Use the past tense : Always write the method section in the past tense.
• Be descriptive : Provide enough detail that another researcher could replicate your experiment, but focus on brevity. Avoid unnecessary detail that is not relevant to the outcome of the experiment.
• Use an academic tone : Use formal language and avoid slang or colloquial expressions. Word choice is also important. Refer to the people in your experiment or study as "participants" rather than "subjects."
• Use APA format : Keep a style guide on hand as you write your method section. The Publication Manual of the American Psychological Association is the official source for APA style.
• Make connections : Read through each section of your paper for agreement with other sections. If you mention procedures in the method section, these elements should be discussed in the results and discussion sections.
• Proofread : Check your paper for grammar, spelling, and punctuation errors.. typos, grammar problems, and spelling errors. Although a spell checker is a handy tool, there are some errors only you can catch.

After writing a draft of your method section, be sure to get a second opinion. You can often become too close to your work to see errors or lack of clarity. Take a rough draft of your method section to your university's writing lab for additional assistance.

A Word From Verywell

The method section is one of the most important components of your APA format paper. The goal of your paper should be to clearly detail what you did in your experiment. Provide enough detail that another researcher could replicate your study if they wanted.

Finally, if you are writing your paper for a class or for a specific publication, be sure to keep in mind any specific instructions provided by your instructor or by the journal editor. Your instructor may have certain requirements that you need to follow while writing your method section.

Frequently Asked Questions

While the subsections can vary, the three components that should be included are sections on the participants, the materials, and the procedures.

• Describe who the participants were in the study and how they were selected.
• Define and describe the materials that were used including any equipment, tests, or assessments
• Describe how the data was collected

To write your methods section in APA format, describe your participants, materials, study design, and procedures. Keep this section succinct, and always write in the past tense. The main heading of this section should be labeled "Method" and it should be centered, bolded, and capitalized. Each subheading within this section should be bolded, left-aligned and in title case.

The purpose of the methods section is to describe what you did in your experiment. It should be brief, but include enough detail that someone could replicate your experiment based on this information. Your methods section should detail what you did to answer your research question. Describe how the study was conducted, the study design that was used and why it was chosen, and how you collected the data and analyzed the results.

Erdemir F. How to write a materials and methods section of a scientific article ? Turk J Urol . 2013;39(Suppl 1):10-5. doi:10.5152/tud.2013.047

Kallet RH. How to write the methods section of a research paper . Respir Care . 2004;49(10):1229-32. PMID: 15447808.

American Psychological Association.  Publication Manual of the American Psychological Association  (7th ed.). Washington DC: The American Psychological Association; 2019.

American Psychological Association. APA Style Journal Article Reporting Standards . Published 2020.

By Kendra Cherry, MSEd Kendra Cherry, MS, is a psychosocial rehabilitation specialist, psychology educator, and author of the "Everything Psychology Book."

How to Write a Research Paper

Use the links below to jump directly to any section of this guide:

Research Paper Fundamentals

How to choose a topic or question, how to create a working hypothesis or thesis, common research paper methodologies, how to gather and organize evidence , how to write an outline for your research paper, how to write a rough draft, how to revise your draft, how to produce a final draft, resources for teachers .

It is not fair to say that no one writes anymore. Just about everyone writes text messages, brief emails, or social media posts every single day. Yet, most people don't have a lot of practice with the formal, organized writing required for a good academic research paper. This guide contains links to a variety of resources that can help demystify the process. Some of these resources are intended for teachers; they contain exercises, activities, and teaching strategies. Other resources are intended for direct use by students who are struggling to write papers, or are looking for tips to make the process go more smoothly.

The resources in this section are designed to help students understand the different types of research papers, the general research process, and how to manage their time. Below, you'll find links from university writing centers, the trusted Purdue Online Writing Lab, and more.

What is an Academic Research Paper?

"Genre and the Research Paper" (Purdue OWL)

There are different types of research papers. Different types of scholarly questions will lend themselves to one format or another. This is a brief introduction to the two main genres of research paper: analytic and argumentative. 

"7 Most Popular Types of Research Papers" (Personal-writer.com)

This resource discusses formats that high school students commonly encounter, such as the compare and contrast essay and the definitional essay. Please note that the inclusion of this link is not an endorsement of this company's paid service.

How to Prepare and Plan Out Writing a Research Paper

Teachers can give their students a step-by-step guide like these to help them understand the different steps of the research paper process. These guides can be combined with the time management tools in the next subsection to help students come up with customized calendars for completing their papers.

"Ten Steps for Writing Research Papers" (American University)  

This resource from American University is a comprehensive guide to the research paper writing process, and includes examples of proper research questions and thesis topics.

"Steps in Writing a Research Paper" (SUNY Empire State College)

This guide breaks the research paper process into 11 steps. Each "step" links to a separate page, which describes the work entailed in completing it.

How to Manage Time Effectively

The links below will help students determine how much time is necessary to complete a paper. If your sources are not available online or at your local library, you'll need to leave extra time for the Interlibrary Loan process. Remember that, even if you do not need to consult secondary sources, you'll still need to leave yourself ample time to organize your thoughts.

"Research Paper Planner: Timeline" (Baylor University)

This interactive resource from Baylor University creates a suggested writing schedule based on how much time a student has to work on the assignment.

"Research Paper Planner" (UCLA)

UCLA's library offers this step-by-step guide to the research paper writing process, which also includes a suggested planning calendar.

There's a reason teachers spend a long time talking about choosing a good topic. Without a good topic and a well-formulated research question, it is almost impossible to write a clear and organized paper. The resources below will help you generate ideas and formulate precise questions.

"How to Select a Research Topic" (Univ. of Michigan-Flint)

This resource is designed for college students who are struggling to come up with an appropriate topic. A student who uses this resource and still feels unsure about his or her topic should consult the course instructor for further personalized assistance.

"25 Interesting Research Paper Topics to Get You Started" (Kibin)

This resource, which is probably most appropriate for high school students, provides a list of specific topics to help get students started. It is broken into subsections, such as "paper topics on local issues."

"Writing a Good Research Question" (Grand Canyon University)

This introduction to research questions includes some embedded videos, as well as links to scholarly articles on research questions. This resource would be most appropriate for teachers who are planning lessons on research paper fundamentals.

"How to Write a Research Question the Right Way" (Kibin)

This student-focused resource provides more detail on writing research questions. The language is accessible, and there are embedded videos and examples of good and bad questions.

It is important to have a rough hypothesis or thesis in mind at the beginning of the research process. People who have a sense of what they want to say will have an easier time sorting through scholarly sources and other information. The key, of course, is not to become too wedded to the draft hypothesis or thesis. Just about every working thesis gets changed during the research process.

CrashCourse Video: "Sociology Research Methods" (YouTube)

Although this video is tailored to sociology students, it is applicable to students in a variety of social science disciplines. This video does a good job demonstrating the connection between the brainstorming that goes into selecting a research question and the formulation of a working hypothesis.

"How to Write a Thesis Statement for an Analytical Essay" (YouTube)

Students writing analytical essays will not develop the same type of working hypothesis as students who are writing research papers in other disciplines. For these students, developing the working thesis may happen as a part of the rough draft (see the relevant section below). 

"Research Hypothesis" (Oakland Univ.)

This resource provides some examples of hypotheses in social science disciplines like Political Science and Criminal Justice. These sample hypotheses may also be useful for students in other soft social sciences and humanities disciplines like History.

When grading a research paper, instructors look for a consistent methodology. This section will help you understand different methodological approaches used in research papers. Students will get the most out of these resources if they use them to help prepare for conversations with teachers or discussions in class.

"Types of Research Designs" (USC)

A "research design," used for complex papers, is related to the paper's method. This resource contains introductions to a variety of popular research designs in the social sciences. Although it is not the most intuitive site to read, the information here is very valuable. 

"Major Research Methods" (YouTube)

Although this video is a bit on the dry side, it provides a comprehensive overview of the major research methodologies in a format that might be more accessible to students who have struggled with textbooks or other written resources.

"Humanities Research Strategies" (USC)

This is a portal where students can learn about four methodological approaches for humanities papers: Historical Methodologies, Textual Criticism, Conceptual Analysis, and the Synoptic method.

"Selected Major Social Science Research Methods: Overview" (National Academies Press)

This appendix from the book  Using Science as Evidence in Public Policy , printed by National Academies Press, introduces some methods used in social science papers.

"Organizing Your Social Sciences Research Paper: 6. The Methodology" (USC)

This resource from the University of Southern California's library contains tips for writing a methodology section in a research paper.

How to Determine the Best Methodology for You

Anyone who is new to writing research papers should be sure to select a method in consultation with their instructor. These resources can be used to help prepare for that discussion. They may also be used on their own by more advanced students.

"Choosing Appropriate Research Methodologies" (Palgrave Study Skills)

This friendly and approachable resource from Palgrave Macmillan can be used by students who are just starting to think about appropriate methodologies.

"How to Choose Your Research Methods" (NFER (UK))

This is another approachable resource students can use to help narrow down the most appropriate methods for their research projects.

The resources in this section introduce the process of gathering scholarly sources and collecting evidence. You'll find a range of material here, from introductory guides to advanced explications best suited to college students. Please consult the LitCharts  How to Do Academic Research guide for a more comprehensive list of resources devoted to finding scholarly literature.

Google Scholar

Students who have access to library websites with detailed research guides should start there, but people who do not have access to those resources can begin their search for secondary literature here.

"Gathering Appropriate Information" (Texas Gateway)

This resource from the Texas Gateway for online resources introduces students to the research process, and contains interactive exercises. The level of complexity is suitable for middle school, high school, and introductory college classrooms.

"An Overview of Quantitative and Qualitative Data Collection Methods" (NSF)

This PDF from the National Science Foundation goes into detail about best practices and pitfalls in data collection across multiple types of methodologies.

"Social Science Methods for Data Collection and Analysis" (Swiss FIT)

This resource is appropriate for advanced undergraduates or teachers looking to create lessons on research design and data collection. It covers techniques for gathering data via interviews, observations, and other methods.

"Collecting Data by In-depth Interviewing" (Leeds Univ.)

This resource contains enough information about conducting interviews to make it useful for teachers who want to create a lesson plan, but is also accessible enough for college juniors or seniors to make use of it on their own.

There is no "one size fits all" outlining technique. Some students might devote all their energy and attention to the outline in order to avoid the paper. Other students may benefit from being made to sit down and organize their thoughts into a lengthy sentence outline. The resources in this section include strategies and templates for multiple types of outlines. 

"Topic vs. Sentence Outlines" (UC Berkeley)

This resource introduces two basic approaches to outlining: the shorter topic-based approach, and the longer, more detailed sentence-based approach. This resource also contains videos on how to develop paper paragraphs from the sentence-based outline.

"Types of Outlines and Samples" (Purdue OWL)

The Purdue Online Writing Lab's guide is a slightly less detailed discussion of different types of outlines. It contains several sample outlines.

"Writing An Outline" (Austin C.C.)

This resource from a community college contains sample outlines from an American history class that students can use as models.

"How to Structure an Outline for a College Paper" (YouTube)

This brief (sub-2 minute) video from the ExpertVillage YouTube channel provides a model of outline writing for students who are struggling with the idea.

"Outlining" (Harvard)

This is a good resource to consult after completing a draft outline. It offers suggestions for making sure your outline avoids things like unnecessary repetition.

As with outlines, rough drafts can take on many different forms. These resources introduce teachers and students to the various approaches to writing a rough draft. This section also includes resources that will help you cite your sources appropriately according to the MLA, Chicago, and APA style manuals.

"Creating a Rough Draft for a Research Paper" (Univ. of Minnesota)

This resource is useful for teachers in particular, as it provides some suggested exercises to help students with writing a basic rough draft. 

Rough Draft Assignment (Duke of Definition)

This sample assignment, with a brief list of tips, was developed by a high school teacher who runs a very successful and well-reviewed page of educational resources.

"Creating the First Draft of Your Research Paper" (Concordia Univ.)

This resource will be helpful for perfectionists or procrastinators, as it opens by discussing the problem of avoiding writing. It also provides a short list of suggestions meant to get students writing.

Using Proper Citations

There is no such thing as a rough draft of a scholarly citation. These links to the three major citation guides will ensure that your citations follow the correct format. Please consult the LitCharts How to Cite Your Sources guide for more resources.

Chicago Manual of Style Citation Guide

Some call  The Chicago Manual of Style , which was first published in 1906, "the editors' Bible." The manual is now in its 17th edition, and is popular in the social sciences, historical journals, and some other fields in the humanities.

APA Citation Guide

According to the American Psychological Association, this guide was developed to aid reading comprehension, clarity of communication, and to reduce bias in language in the social and behavioral sciences. Its first full edition was published in 1952, and it is now in its sixth edition.

MLA Citation Guide

The Modern Language Association style is used most commonly within the liberal arts and humanities. The  MLA Style Manual and Guide to Scholarly Publishing  was first published in 1985 and (as of 2008) is in its third edition.

Any professional scholar will tell you that the best research papers are made in the revision stage. No matter how strong your research question or working thesis, it is not possible to write a truly outstanding paper without devoting energy to revision. These resources provide examples of revision exercises for the classroom, as well as tips for students working independently.

"The Art of Revision" (Univ. of Arizona)

This resource provides a wealth of information and suggestions for both students and teachers. There is a list of suggested exercises that teachers might use in class, along with a revision checklist that is useful for teachers and students alike.

"Script for Workshop on Revision" (Vanderbilt University)

Vanderbilt's guide for leading a 50-minute revision workshop can serve as a model for teachers who wish to guide students through the revision process during classtime. 

"Revising Your Paper" (Univ. of Washington)

This detailed handout was designed for students who are beginning the revision process. It discusses different approaches and methods for revision, and also includes a detailed list of things students should look for while they revise.

"Revising Drafts" (UNC Writing Center)

This resource is designed for students and suggests things to look for during the revision process. It provides steps for the process and has a FAQ for students who have questions about why it is important to revise.

Conferencing with Writing Tutors and Instructors

No writer is so good that he or she can't benefit from meeting with instructors or peer tutors. These resources from university writing, learning, and communication centers provide suggestions for how to get the most out of these one-on-one meetings.

"Getting Feedback" (UNC Writing Center)

This very helpful resource talks about how to ask for feedback during the entire writing process. It contains possible questions that students might ask when developing an outline, during the revision process, and after the final draft has been graded.

"Prepare for Your Tutoring Session" (Otis College of Art and Design)

This guide from a university's student learning center contains a lot of helpful tips for getting the most out of working with a writing tutor.

"The Importance of Asking Your Professor" (Univ. of Waterloo)

This article from the university's Writing and Communication Centre's blog contains some suggestions for how and when to get help from professors and Teaching Assistants.

Once you've revised your first draft, you're well on your way to handing in a polished paper. These resources—each of them produced by writing professionals at colleges and universities—outline the steps required in order to produce a final draft. You'll find proofreading tips and checklists in text and video form.

"Developing a Final Draft of a Research Paper" (Univ. of Minnesota)

While this resource contains suggestions for revision, it also features a couple of helpful checklists for the last stages of completing a final draft.

Basic Final Draft Tips and Checklist (Univ. of Maryland-University College)

This short and accessible resource, part of UMUC's very thorough online guide to writing and research, contains a very basic checklist for students who are getting ready to turn in their final drafts.

Final Draft Checklist (Everett C.C.)

This is another accessible final draft checklist, appropriate for both high school and college students. It suggests reading your essay aloud at least once.

"How to Proofread Your Final Draft" (YouTube)

This video (approximately 5 minutes), produced by Eastern Washington University, gives students tips on proofreading final drafts.

"Proofreading Tips" (Georgia Southern-Armstrong)

This guide will help students learn how to spot common errors in their papers. It suggests focusing on content and editing for grammar and mechanics.

This final set of resources is intended specifically for high school and college instructors. It provides links to unit plans and classroom exercises that can help improve students' research and writing skills. You'll find resources that give an overview of the process, along with activities that focus on how to begin and how to carry out research. 

"Research Paper Complete Resources Pack" (Teachers Pay Teachers)

This packet of assignments, rubrics, and other resources is designed for high school students. The resources in this packet are aligned to Common Core standards.

"Research Paper—Complete Unit" (Teachers Pay Teachers)

This packet of assignments, notes, PowerPoints, and other resources has a 4/4 rating with over 700 ratings. It is designed for high school teachers, but might also be useful to college instructors who work with freshmen.

"Teaching Students to Write Good Papers" (Yale)

This resource from Yale's Center for Teaching and Learning is designed for college instructors, and it includes links to appropriate activities and exercises.

"Research Paper Writing: An Overview" (CUNY Brooklyn)

CUNY Brooklyn offers this complete lesson plan for introducing students to research papers. It includes an accompanying set of PowerPoint slides.

"Lesson Plan: How to Begin Writing a Research Paper" (San Jose State Univ.)

This lesson plan is designed for students in the health sciences, so teachers will have to modify it for their own needs. It includes a breakdown of the brainstorming, topic selection, and research question process. 

"Quantitative Techniques for Social Science Research" (Univ. of Pittsburgh)

This is a set of PowerPoint slides that can be used to introduce students to a variety of quantitative methods used in the social sciences.

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The Research Paper

There will come a time in most students' careers when they are assigned a research paper. Such an assignment often creates a great deal of unneeded anxiety in the student, which may result in procrastination and a feeling of confusion and inadequacy. This anxiety frequently stems from the fact that many students are unfamiliar and inexperienced with this genre of writing. Never fear—inexperience and unfamiliarity are situations you can change through practice! Writing a research paper is an essential aspect of academics and should not be avoided on account of one's anxiety. In fact, the process of writing a research paper can be one of the more rewarding experiences one may encounter in academics. What is more, many students will continue to do research throughout their careers, which is one of the reasons this topic is so important.

Becoming an experienced researcher and writer in any field or discipline takes a great deal of practice. There are few individuals for whom this process comes naturally. Remember, even the most seasoned academic veterans have had to learn how to write a research paper at some point in their career. Therefore, with diligence, organization, practice, a willingness to learn (and to make mistakes!), and, perhaps most important of all, patience, students will find that they can achieve great things through their research and writing.

The pages in this section cover the following topic areas related to the process of writing a research paper:

• Genre - This section will provide an overview for understanding the difference between an analytical and argumentative research paper.
• Choosing a Topic - This section will guide the student through the process of choosing topics, whether the topic be one that is assigned or one that the student chooses themselves.
• Identifying an Audience - This section will help the student understand the often times confusing topic of audience by offering some basic guidelines for the process.
• Where Do I Begin - This section concludes the handout by offering several links to resources at Purdue, and also provides an overview of the final stages of writing a research paper.

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Research Paper – Structure, Examples and Writing Guide

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Research Paper

Definition:

Research Paper is a written document that presents the author’s original research, analysis, and interpretation of a specific topic or issue.

It is typically based on Empirical Evidence, and may involve qualitative or quantitative research methods, or a combination of both. The purpose of a research paper is to contribute new knowledge or insights to a particular field of study, and to demonstrate the author’s understanding of the existing literature and theories related to the topic.

Structure of Research Paper

The structure of a research paper typically follows a standard format, consisting of several sections that convey specific information about the research study. The following is a detailed explanation of the structure of a research paper:

The title page contains the title of the paper, the name(s) of the author(s), and the affiliation(s) of the author(s). It also includes the date of submission and possibly, the name of the journal or conference where the paper is to be published.

The abstract is a brief summary of the research paper, typically ranging from 100 to 250 words. It should include the research question, the methods used, the key findings, and the implications of the results. The abstract should be written in a concise and clear manner to allow readers to quickly grasp the essence of the research.

Introduction

The introduction section of a research paper provides background information about the research problem, the research question, and the research objectives. It also outlines the significance of the research, the research gap that it aims to fill, and the approach taken to address the research question. Finally, the introduction section ends with a clear statement of the research hypothesis or research question.

Literature Review

The literature review section of a research paper provides an overview of the existing literature on the topic of study. It includes a critical analysis and synthesis of the literature, highlighting the key concepts, themes, and debates. The literature review should also demonstrate the research gap and how the current study seeks to address it.

The methods section of a research paper describes the research design, the sample selection, the data collection and analysis procedures, and the statistical methods used to analyze the data. This section should provide sufficient detail for other researchers to replicate the study.

The results section presents the findings of the research, using tables, graphs, and figures to illustrate the data. The findings should be presented in a clear and concise manner, with reference to the research question and hypothesis.

The discussion section of a research paper interprets the findings and discusses their implications for the research question, the literature review, and the field of study. It should also address the limitations of the study and suggest future research directions.

The conclusion section summarizes the main findings of the study, restates the research question and hypothesis, and provides a final reflection on the significance of the research.

The references section provides a list of all the sources cited in the paper, following a specific citation style such as APA, MLA or Chicago.

How to Write Research Paper

You can write Research Paper by the following guide:

• Choose a Topic: The first step is to select a topic that interests you and is relevant to your field of study. Brainstorm ideas and narrow down to a research question that is specific and researchable.
• Conduct a Literature Review: The literature review helps you identify the gap in the existing research and provides a basis for your research question. It also helps you to develop a theoretical framework and research hypothesis.
• Develop a Thesis Statement : The thesis statement is the main argument of your research paper. It should be clear, concise and specific to your research question.
• Plan your Research: Develop a research plan that outlines the methods, data sources, and data analysis procedures. This will help you to collect and analyze data effectively.
• Collect and Analyze Data: Collect data using various methods such as surveys, interviews, observations, or experiments. Analyze data using statistical tools or other qualitative methods.
• Organize your Paper : Organize your paper into sections such as Introduction, Literature Review, Methods, Results, Discussion, and Conclusion. Ensure that each section is coherent and follows a logical flow.
• Write your Paper : Start by writing the introduction, followed by the literature review, methods, results, discussion, and conclusion. Ensure that your writing is clear, concise, and follows the required formatting and citation styles.
• Edit and Proofread your Paper: Review your paper for grammar and spelling errors, and ensure that it is well-structured and easy to read. Ask someone else to review your paper to get feedback and suggestions for improvement.
• Cite your Sources: Ensure that you properly cite all sources used in your research paper. This is essential for giving credit to the original authors and avoiding plagiarism.

Research Paper Example

Note : The below example research paper is for illustrative purposes only and is not an actual research paper. Actual research papers may have different structures, contents, and formats depending on the field of study, research question, data collection and analysis methods, and other factors. Students should always consult with their professors or supervisors for specific guidelines and expectations for their research papers.

Research Paper Example sample for Students:

Title: The Impact of Social Media on Mental Health among Young Adults

Abstract: This study aims to investigate the impact of social media use on the mental health of young adults. A literature review was conducted to examine the existing research on the topic. A survey was then administered to 200 university students to collect data on their social media use, mental health status, and perceived impact of social media on their mental health. The results showed that social media use is positively associated with depression, anxiety, and stress. The study also found that social comparison, cyberbullying, and FOMO (Fear of Missing Out) are significant predictors of mental health problems among young adults.

Introduction: Social media has become an integral part of modern life, particularly among young adults. While social media has many benefits, including increased communication and social connectivity, it has also been associated with negative outcomes, such as addiction, cyberbullying, and mental health problems. This study aims to investigate the impact of social media use on the mental health of young adults.

Literature Review: The literature review highlights the existing research on the impact of social media use on mental health. The review shows that social media use is associated with depression, anxiety, stress, and other mental health problems. The review also identifies the factors that contribute to the negative impact of social media, including social comparison, cyberbullying, and FOMO.

Methods : A survey was administered to 200 university students to collect data on their social media use, mental health status, and perceived impact of social media on their mental health. The survey included questions on social media use, mental health status (measured using the DASS-21), and perceived impact of social media on their mental health. Data were analyzed using descriptive statistics and regression analysis.

Results : The results showed that social media use is positively associated with depression, anxiety, and stress. The study also found that social comparison, cyberbullying, and FOMO are significant predictors of mental health problems among young adults.

Discussion : The study’s findings suggest that social media use has a negative impact on the mental health of young adults. The study highlights the need for interventions that address the factors contributing to the negative impact of social media, such as social comparison, cyberbullying, and FOMO.

Conclusion : In conclusion, social media use has a significant impact on the mental health of young adults. The study’s findings underscore the need for interventions that promote healthy social media use and address the negative outcomes associated with social media use. Future research can explore the effectiveness of interventions aimed at reducing the negative impact of social media on mental health. Additionally, longitudinal studies can investigate the long-term effects of social media use on mental health.

Limitations : The study has some limitations, including the use of self-report measures and a cross-sectional design. The use of self-report measures may result in biased responses, and a cross-sectional design limits the ability to establish causality.

Implications: The study’s findings have implications for mental health professionals, educators, and policymakers. Mental health professionals can use the findings to develop interventions that address the negative impact of social media use on mental health. Educators can incorporate social media literacy into their curriculum to promote healthy social media use among young adults. Policymakers can use the findings to develop policies that protect young adults from the negative outcomes associated with social media use.

References :

• Twenge, J. M., & Campbell, W. K. (2019). Associations between screen time and lower psychological well-being among children and adolescents: Evidence from a population-based study. Preventive medicine reports, 15, 100918.
• Primack, B. A., Shensa, A., Escobar-Viera, C. G., Barrett, E. L., Sidani, J. E., Colditz, J. B., … & James, A. E. (2017). Use of multiple social media platforms and symptoms of depression and anxiety: A nationally-representative study among US young adults. Computers in Human Behavior, 69, 1-9.
• Van der Meer, T. G., & Verhoeven, J. W. (2017). Social media and its impact on academic performance of students. Journal of Information Technology Education: Research, 16, 383-398.

Appendix : The survey used in this study is provided below.

Social Media and Mental Health Survey

• How often do you use social media per day?
• Less than 30 minutes
• 30 minutes to 1 hour
• 1 to 2 hours
• 2 to 4 hours
• More than 4 hours
• Which social media platforms do you use?
• Others (Please specify)
• How often do you experience the following on social media?
• Social comparison (comparing yourself to others)
• Cyberbullying
• Fear of Missing Out (FOMO)
• Have you ever experienced any of the following mental health problems in the past month?
• Do you think social media use has a positive or negative impact on your mental health?
• Very positive
• Somewhat positive
• Somewhat negative
• Very negative
• In your opinion, which factors contribute to the negative impact of social media on mental health?
• Social comparison
• In your opinion, what interventions could be effective in reducing the negative impact of social media on mental health?
• Education on healthy social media use
• Counseling for mental health problems caused by social media
• Social media detox programs
• Regulation of social media use

Thank you for your participation!

Applications of Research Paper

Research papers have several applications in various fields, including:

• Advancing knowledge: Research papers contribute to the advancement of knowledge by generating new insights, theories, and findings that can inform future research and practice. They help to answer important questions, clarify existing knowledge, and identify areas that require further investigation.
• Informing policy: Research papers can inform policy decisions by providing evidence-based recommendations for policymakers. They can help to identify gaps in current policies, evaluate the effectiveness of interventions, and inform the development of new policies and regulations.
• Improving practice: Research papers can improve practice by providing evidence-based guidance for professionals in various fields, including medicine, education, business, and psychology. They can inform the development of best practices, guidelines, and standards of care that can improve outcomes for individuals and organizations.
• Educating students : Research papers are often used as teaching tools in universities and colleges to educate students about research methods, data analysis, and academic writing. They help students to develop critical thinking skills, research skills, and communication skills that are essential for success in many careers.
• Fostering collaboration: Research papers can foster collaboration among researchers, practitioners, and policymakers by providing a platform for sharing knowledge and ideas. They can facilitate interdisciplinary collaborations and partnerships that can lead to innovative solutions to complex problems.

When to Write Research Paper

Research papers are typically written when a person has completed a research project or when they have conducted a study and have obtained data or findings that they want to share with the academic or professional community. Research papers are usually written in academic settings, such as universities, but they can also be written in professional settings, such as research organizations, government agencies, or private companies.

Here are some common situations where a person might need to write a research paper:

• For academic purposes: Students in universities and colleges are often required to write research papers as part of their coursework, particularly in the social sciences, natural sciences, and humanities. Writing research papers helps students to develop research skills, critical thinking skills, and academic writing skills.
• For publication: Researchers often write research papers to publish their findings in academic journals or to present their work at academic conferences. Publishing research papers is an important way to disseminate research findings to the academic community and to establish oneself as an expert in a particular field.
• To inform policy or practice : Researchers may write research papers to inform policy decisions or to improve practice in various fields. Research findings can be used to inform the development of policies, guidelines, and best practices that can improve outcomes for individuals and organizations.
• To share new insights or ideas: Researchers may write research papers to share new insights or ideas with the academic or professional community. They may present new theories, propose new research methods, or challenge existing paradigms in their field.

Purpose of Research Paper

The purpose of a research paper is to present the results of a study or investigation in a clear, concise, and structured manner. Research papers are written to communicate new knowledge, ideas, or findings to a specific audience, such as researchers, scholars, practitioners, or policymakers. The primary purposes of a research paper are:

• To contribute to the body of knowledge : Research papers aim to add new knowledge or insights to a particular field or discipline. They do this by reporting the results of empirical studies, reviewing and synthesizing existing literature, proposing new theories, or providing new perspectives on a topic.
• To inform or persuade: Research papers are written to inform or persuade the reader about a particular issue, topic, or phenomenon. They present evidence and arguments to support their claims and seek to persuade the reader of the validity of their findings or recommendations.
• To advance the field: Research papers seek to advance the field or discipline by identifying gaps in knowledge, proposing new research questions or approaches, or challenging existing assumptions or paradigms. They aim to contribute to ongoing debates and discussions within a field and to stimulate further research and inquiry.
• To demonstrate research skills: Research papers demonstrate the author’s research skills, including their ability to design and conduct a study, collect and analyze data, and interpret and communicate findings. They also demonstrate the author’s ability to critically evaluate existing literature, synthesize information from multiple sources, and write in a clear and structured manner.

Characteristics of Research Paper

Research papers have several characteristics that distinguish them from other forms of academic or professional writing. Here are some common characteristics of research papers:

• Evidence-based: Research papers are based on empirical evidence, which is collected through rigorous research methods such as experiments, surveys, observations, or interviews. They rely on objective data and facts to support their claims and conclusions.
• Structured and organized: Research papers have a clear and logical structure, with sections such as introduction, literature review, methods, results, discussion, and conclusion. They are organized in a way that helps the reader to follow the argument and understand the findings.
• Formal and objective: Research papers are written in a formal and objective tone, with an emphasis on clarity, precision, and accuracy. They avoid subjective language or personal opinions and instead rely on objective data and analysis to support their arguments.
• Citations and references: Research papers include citations and references to acknowledge the sources of information and ideas used in the paper. They use a specific citation style, such as APA, MLA, or Chicago, to ensure consistency and accuracy.
• Peer-reviewed: Research papers are often peer-reviewed, which means they are evaluated by other experts in the field before they are published. Peer-review ensures that the research is of high quality, meets ethical standards, and contributes to the advancement of knowledge in the field.
• Objective and unbiased: Research papers strive to be objective and unbiased in their presentation of the findings. They avoid personal biases or preconceptions and instead rely on the data and analysis to draw conclusions.

Advantages of Research Paper

Research papers have many advantages, both for the individual researcher and for the broader academic and professional community. Here are some advantages of research papers:

• Contribution to knowledge: Research papers contribute to the body of knowledge in a particular field or discipline. They add new information, insights, and perspectives to existing literature and help advance the understanding of a particular phenomenon or issue.
• Opportunity for intellectual growth: Research papers provide an opportunity for intellectual growth for the researcher. They require critical thinking, problem-solving, and creativity, which can help develop the researcher’s skills and knowledge.
• Career advancement: Research papers can help advance the researcher’s career by demonstrating their expertise and contributions to the field. They can also lead to new research opportunities, collaborations, and funding.
• Academic recognition: Research papers can lead to academic recognition in the form of awards, grants, or invitations to speak at conferences or events. They can also contribute to the researcher’s reputation and standing in the field.
• Impact on policy and practice: Research papers can have a significant impact on policy and practice. They can inform policy decisions, guide practice, and lead to changes in laws, regulations, or procedures.
• Advancement of society: Research papers can contribute to the advancement of society by addressing important issues, identifying solutions to problems, and promoting social justice and equality.

Limitations of Research Paper

Research papers also have some limitations that should be considered when interpreting their findings or implications. Here are some common limitations of research papers:

• Limited generalizability: Research findings may not be generalizable to other populations, settings, or contexts. Studies often use specific samples or conditions that may not reflect the broader population or real-world situations.
• Potential for bias : Research papers may be biased due to factors such as sample selection, measurement errors, or researcher biases. It is important to evaluate the quality of the research design and methods used to ensure that the findings are valid and reliable.
• Ethical concerns: Research papers may raise ethical concerns, such as the use of vulnerable populations or invasive procedures. Researchers must adhere to ethical guidelines and obtain informed consent from participants to ensure that the research is conducted in a responsible and respectful manner.
• Limitations of methodology: Research papers may be limited by the methodology used to collect and analyze data. For example, certain research methods may not capture the complexity or nuance of a particular phenomenon, or may not be appropriate for certain research questions.
• Publication bias: Research papers may be subject to publication bias, where positive or significant findings are more likely to be published than negative or non-significant findings. This can skew the overall findings of a particular area of research.
• Time and resource constraints: Research papers may be limited by time and resource constraints, which can affect the quality and scope of the research. Researchers may not have access to certain data or resources, or may be unable to conduct long-term studies due to practical limitations.

About the author

Muhammad Hassan

Researcher, Academic Writer, Web developer

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Research Paper Format: Your Ultimate Guide

In this article, our research proposal writing service experts will empower you to understand the critical role of formatting in academic writing. You'll explore various types of research papers and tailor your format to the specific demands of your project. Learn how to format a research paper in APA, MLA, ASA, and Chicago styles, and demystify the art of citation in each. Gain insights into crafting a well-structured, impactful paper, and join us as we unlock your research paper's true potential and elevate your academic writing skills to new heights!

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The Basics of Research Paper Formats

Before diving into the intricacies of different paper writing formats, it's essential to establish a clear understanding of what exactly a research paper format entails. In essence, it is a structured set of guidelines and rules that govern the layout, organization, and overall presentation of your scholarly work. It encompasses elements such as font styles, margins, headings, citations, and reference lists.

Why is adhering to a specific research article format so crucial? The answer lies in the very essence of academic writing. Research papers are the means through which scholars and students communicate their ideas, findings, and insights to the academic community and the world at large. Consistency in formatting is paramount because it ensures that your work is presented in a standardized, professional manner. Adhering to a specific format serves multiple purposes:

• Clarity and Professionalism: A consistent format enhances the clarity of your paper and presents it in a professional light. It allows readers to focus on the content rather than being distracted by inconsistent styling.
• Communication: Standardized formatting conventions enable scholars from various disciplines and institutions to understand your research more easily. It's a universal language that transcends academic boundaries.
• Credibility: Conforming to a recognized format demonstrates your commitment to the academic standards of your field. It establishes credibility and trust among your readers.

Formatting research papers effectively isn't just about aesthetics; it plays a pivotal role in making your research paper more readable and comprehensible. Here's how:

• Logical Flow: A well-structured format with clear headings and subheadings helps your readers navigate through your paper with ease, following the logical flow of your argument or analysis.
• Citations and References: Proper citation and referencing, integral parts of formatting, giving due credit to the sources you've used, and lending authority to your research.
• Consistency: Consistent formatting, from margins to font size and citation style, fosters a sense of order and coherence, making it simpler for your audience to focus on the content.
• Accessibility: An appropriate format ensures that your research paper is accessible to individuals with diverse reading preferences and needs. It accommodates those who skim, scan, or read in detail.

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How the Choice of Format May Vary Based on the Type of Research Paper?

The type of paper you're working on plays a significant role in determining the most suitable college research paper format. For instance:

• Argumentative Papers: These often follow formats that highlight the thesis statement, counterarguments, and supporting evidence. In APA or MLA formats, clear citations and references are key.
• Analytical Papers: These may employ a variety of formats depending on the discipline, but clarity and logical flow are always crucial. APA or MLA can work well, depending on the subject.
• Empirical Papers: APA format is commonly used for empirical research papers due to its focus on methodology, results, and statistics.
• Literature Reviews: A literature review might follow APA, MLA, or Chicago styles, depending on the subject area. Consistent citation and referencing are essential.
• Survey Research Papers: APA or ASA (American Sociological Association) formats are often used for survey research, emphasizing methodology and results.

How to Format a Research Paper in Different Citation Styles?

The art of crafting a research paper layout extends beyond structure and organization; it also encompasses the intricate details of citation styles. Each academic discipline has its preferred citation style, and mastering the nuances of these styles is essential for academic success. In this section, we'll provide you with the knowledge and tools to navigate the intricacies of APA, MLA, ASA, and Chicago formats. Whether you're working on research paper topics in psychology, literature, sociology, or history, understanding how to format your paper is the key to presenting your findings with precision and authority.

APA Research Paper Format

When it comes to academic writing, the American Psychological Association (APA) style is a formidable presence. Widely used in the fields of psychology, education, and the social sciences, mastering the APA research paper format is essential for researchers, scholars, and students. In this section, we'll delve into the core elements of APA formatting, offering insights into everything from title pages to reference lists. Whether you're embarking on a psychology research paper or exploring the intricacies of the social sciences, understanding the APA format is your key to presenting research with clarity and precision. And, should you ever need assistance in crafting a well-structured paper, you can always rely on our expertise and request, ' write my research paper for me'!

How to Cite a Research Paper in APA?

Citing sources in an APA research paper format is essential for acknowledging the work of others and maintaining the credibility of your own research. Let's explore the key aspects of APA citation with concise examples:

In-Text Citations

In APA, in-text citations include the author's last name and the publication year. They can be integrated into your sentence or enclosed in parentheses.

Author's Name in the Sentence:

• Smith (2018) argued that...
• According to Smith (2018),...

Author's Name in Parentheses:

• This theory has been widely accepted (Smith, 2018).
• The results were inconclusive (Jones & Lee, 2019).
• When no author is available, use the first few words of the reference list entry and the year: ('Title of Article,' 2020).

Reference List

The reference list, located at the end of your paper, lists all the sources cited. Entries follow a specific format:

• Author(s): Last name and initials or organization name.
• Publication Year: Enclosed in parentheses.
• Title of Work: Italicized with sentence case.
• Source: Journal, book, or website.
• DOI or URL: For online sources.
• Smith, J. R. (2017). The Art of Research. American Psychological Association.

Journal Article:

• Brown, M., & Davis, S. (2020). Experimental Findings in Neuroscience. Journal of Advanced Research, 32(5), 123-135.

Online Source:

• Johnson, L. (2019). The Digital Age: A Comprehensive Overview. Retrieved from https://www.examplewebsite.com/digital-age

ASA Research Paper Format

The American Sociological Association (ASA) format serves as the standard in sociology and related disciplines, providing a structured framework for presenting research findings. Whether you're exploring social issues, demographics, or cultural phenomena, understanding the ASA research paper format is pivotal. In this section, we'll introduce you to the key elements of ASA formatting and guide you through the process of citing sources effectively.

How to Cite a Research Paper in ASA?

Citing sources in ASA format follows a specific set of guidelines designed to maintain consistency and clarity in sociological research. Let's delve into ASA citation with clear examples to ensure your research papers align with this discipline's requirements.

ASA in-text citations typically include the author's last name and the publication year, with variations based on whether the author is named in the text or included in parentheses.

• Johnson (2019) argued that...
• According to Johnson (2019),...
• This theory has been widely accepted (Johnson 2019).
• The results were inconclusive (Smith and Lee 2018).

The ASA reference list, located at the end of your paper, lists all the sources cited. Entries should include:

• Author(s): Last name, first name.
• Title of Work: Italicized in title case.
• Smith, John. 2017. The Art of Research. American Sociological Association.
• Brown, Mary, and Davis, Susan. 2020. 'Experimental Findings in Sociology.' Journal of Advanced Research 32(5): 123-135.
• Johnson, Laura. 2019. 'The Digital Age: A Comprehensive Overview.' Retrieved from https://www.examplewebsite.com/digital-age

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MLA Format Research Paper

The Modern Language Association (MLA) style is widely used in the humanities, including literature, language studies, and the arts. Navigating the research paper format MLA is essential for scholars and students in these fields. In this section, we'll provide an overview of the key elements of MLA formatting, guiding you through the process of citing sources accurately.

How to Cite a Research Paper in MLA?

Learning how to write a research paper in MLA format adheres to specific rules to ensure the clarity and consistency of your research papers. Let's delve into MLA citation with illustrative examples:

MLA in-text citations typically include the author's last name and the page number in parentheses. The format can vary based on whether the author's name is included in the sentence or enclosed in parentheses.

• Smith argued that 'the sky is blue' (25).
• According to Smith, 'the sky is blue' (25).
• This theory has been widely accepted (Johnson 42).
• The results were inconclusive (Smith and Lee 56).

Works Cited Page

The Works Cited page, located at the end of your paper, provides a comprehensive list of all the sources cited. Entries follow a specific format:

• Title of Work: Italicized with title case.
• Page Numbers: For print sources.
• URL: For online sources.
• Smith, John. The Art of Research. American Literary Press, 2017.
• Brown, Mary, and Susan Davis. 'Experimental Findings in Literature.' Journal of Advanced Research , vol. 32, no. 5, 2020, pp. 123-135.
• Johnson, Laura. 'The Digital Age: A Comprehensive Overview.' www.examplewebsite.com/digital-age.

Chicago Style of Citing Research Paper

The Chicago Manual of Style (CMS) is a versatile and widely recognized style guide used across various disciplines, including history, social sciences, and fine arts. Mastery of the Chicago research paper format is a valuable skill for researchers and students in these fields. In this section, we will explore the core elements of Chicago formatting and guide you through the process of accurately citing sources.

How to Cite a Research Paper in Chicago Style?

Chicago citation style offers flexibility, accommodating both notes and bibliography (NB) and author-date (AD) systems. Let's delve into Chicago citation with examples to ensure your research papers adhere to the requirements of your discipline.

In Chicago NB (Notes and Bibliography) format, in-text citations often appear as footnotes or endnotes, while Chicago AD (Author-Date) format employs parenthetical citations. The format can vary based on whether the author's name is included in the sentence or enclosed in parentheses.

Chicago NB Format:

• Smith argued that 'the sky is blue.' ¹
• According to Smith, 'the sky is blue.' ²

Chicago AD Format:

• (Smith 2017, 25)
• (Smith and Lee 2018, 56)

Bibliography (Chicago NB) or Reference List (Chicago AD)

The Bibliography (for NB) or Reference List (for AD) is located at the end of your paper and lists all the sources cited. Entries follow specific formats:

Book (Chicago NB):

Journal Article (Chicago AD):

• Brown, Mary, and Susan Davis. 2020. 'Experimental Findings in History.' Journal of Advanced Research 32, no. 5: 123-135.

Online Source (Chicago NB):

In the world of academia, mastering different types of research paper formatting and the art of citation is your passport to success. Whether it's APA, MLA, ASA, or Chicago, each format has its nuances, and understanding them is crucial. With a well-structured outline, clarity in in-text citations, and a meticulously organized reference list, you're poised to navigate the complexities of research paper writing. As you embark on your academic journey, remember that precise formatting and citing not only uphold the integrity of your work work but also enhance your scholarly impact.

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Organizing Your Social Sciences Research Paper

Glossary of research terms.

• Purpose of Guide
• Design Flaws to Avoid
• Independent and Dependent Variables
• Reading Research Effectively
• Narrowing a Topic Idea
• Broadening a Topic Idea
• Extending the Timeliness of a Topic Idea
• Academic Writing Style
• Applying Critical Thinking
• Choosing a Title
• Making an Outline
• Paragraph Development
• Research Process Video Series
• Executive Summary
• The C.A.R.S. Model
• Background Information
• The Research Problem/Question
• Theoretical Framework
• Citation Tracking
• Content Alert Services
• Evaluating Sources
• Primary Sources
• Secondary Sources
• Tiertiary Sources
• Scholarly vs. Popular Publications
• Qualitative Methods
• Quantitative Methods
• Insiderness
• Using Non-Textual Elements
• Limitations of the Study
• Common Grammar Mistakes
• Writing Concisely
• Avoiding Plagiarism
• Footnotes or Endnotes?
• Further Readings
• Generative AI and Writing
• USC Libraries Tutorials and Other Guides
• Bibliography

This glossary is intended to assist you in understanding commonly used terms and concepts when reading, interpreting, and evaluating scholarly research. Also included are common words and phrases defined within the context of how they apply to research in the social and behavioral sciences.

• Acculturation -- refers to the process of adapting to another culture, particularly in reference to blending in with the majority population [e.g., an immigrant adopting American customs]. However, acculturation also implies that both cultures add something to one another, but still remain distinct groups unto themselves.
• Accuracy -- a term used in survey research to refer to the match between the target population and the sample.
• Affective Measures -- procedures or devices used to obtain quantified descriptions of an individual's feelings, emotional states, or dispositions.
• Aggregate -- a total created from smaller units. For instance, the population of a county is an aggregate of the populations of the cities, rural areas, etc. that comprise the county. As a verb, it refers to total data from smaller units into a large unit.
• Anonymity -- a research condition in which no one, including the researcher, knows the identities of research participants.
• Baseline -- a control measurement carried out before an experimental treatment.
• Behaviorism -- school of psychological thought concerned with the observable, tangible, objective facts of behavior, rather than with subjective phenomena such as thoughts, emotions, or impulses. Contemporary behaviorism also emphasizes the study of mental states such as feelings and fantasies to the extent that they can be directly observed and measured.
• Beliefs -- ideas, doctrines, tenets, etc. that are accepted as true on grounds which are not immediately susceptible to rigorous proof.
• Benchmarking -- systematically measuring and comparing the operations and outcomes of organizations, systems, processes, etc., against agreed upon "best-in-class" frames of reference.
• Bias -- a loss of balance and accuracy in the use of research methods. It can appear in research via the sampling frame, random sampling, or non-response. It can also occur at other stages in research, such as while interviewing, in the design of questions, or in the way data are analyzed and presented. Bias means that the research findings will not be representative of, or generalizable to, a wider population.
• Case Study -- the collection and presentation of detailed information about a particular participant or small group, frequently including data derived from the subjects themselves.
• Causal Hypothesis -- a statement hypothesizing that the independent variable affects the dependent variable in some way.
• Causal Relationship -- the relationship established that shows that an independent variable, and nothing else, causes a change in a dependent variable. It also establishes how much of a change is shown in the dependent variable.
• Causality -- the relation between cause and effect.
• Central Tendency -- any way of describing or characterizing typical, average, or common values in some distribution.
• Chi-square Analysis -- a common non-parametric statistical test which compares an expected proportion or ratio to an actual proportion or ratio.
• Claim -- a statement, similar to a hypothesis, which is made in response to the research question and that is affirmed with evidence based on research.
• Classification -- ordering of related phenomena into categories, groups, or systems according to characteristics or attributes.
• Cluster Analysis -- a method of statistical analysis where data that share a common trait are grouped together. The data is collected in a way that allows the data collector to group data according to certain characteristics.
• Cohort Analysis -- group by group analytic treatment of individuals having a statistical factor in common to each group. Group members share a particular characteristic [e.g., born in a given year] or a common experience [e.g., entering a college at a given time].
• Confidentiality -- a research condition in which no one except the researcher(s) knows the identities of the participants in a study. It refers to the treatment of information that a participant has disclosed to the researcher in a relationship of trust and with the expectation that it will not be revealed to others in ways that violate the original consent agreement, unless permission is granted by the participant.
• Confirmability Objectivity -- the findings of the study could be confirmed by another person conducting the same study.
• Construct -- refers to any of the following: something that exists theoretically but is not directly observable; a concept developed [constructed] for describing relations among phenomena or for other research purposes; or, a theoretical definition in which concepts are defined in terms of other concepts. For example, intelligence cannot be directly observed or measured; it is a construct.
• Construct Validity -- seeks an agreement between a theoretical concept and a specific measuring device, such as observation.
• Constructivism -- the idea that reality is socially constructed. It is the view that reality cannot be understood outside of the way humans interact and that the idea that knowledge is constructed, not discovered. Constructivists believe that learning is more active and self-directed than either behaviorism or cognitive theory would postulate.
• Content Analysis -- the systematic, objective, and quantitative description of the manifest or latent content of print or nonprint communications.
• Context Sensitivity -- awareness by a qualitative researcher of factors such as values and beliefs that influence cultural behaviors.
• Control Group -- the group in an experimental design that receives either no treatment or a different treatment from the experimental group. This group can thus be compared to the experimental group.
• Controlled Experiment -- an experimental design with two or more randomly selected groups [an experimental group and control group] in which the researcher controls or introduces the independent variable and measures the dependent variable at least two times [pre- and post-test measurements].
• Correlation -- a common statistical analysis, usually abbreviated as r, that measures the degree of relationship between pairs of interval variables in a sample. The range of correlation is from -1.00 to zero to +1.00. Also, a non-cause and effect relationship between two variables.
• Covariate -- a product of the correlation of two related variables times their standard deviations. Used in true experiments to measure the difference of treatment between them.
• Credibility -- a researcher's ability to demonstrate that the object of a study is accurately identified and described based on the way in which the study was conducted.
• Critical Theory -- an evaluative approach to social science research, associated with Germany's neo-Marxist “Frankfurt School,” that aims to criticize as well as analyze society, opposing the political orthodoxy of modern communism. Its goal is to promote human emancipatory forces and to expose ideas and systems that impede them.
• Data -- factual information [as measurements or statistics] used as a basis for reasoning, discussion, or calculation.
• Data Mining -- the process of analyzing data from different perspectives and summarizing it into useful information, often to discover patterns and/or systematic relationships among variables.
• Data Quality -- this is the degree to which the collected data [results of measurement or observation] meet the standards of quality to be considered valid [trustworthy] and  reliable [dependable].
• Deductive -- a form of reasoning in which conclusions are formulated about particulars from general or universal premises.
• Dependability -- being able to account for changes in the design of the study and the changing conditions surrounding what was studied.
• Dependent Variable -- a variable that varies due, at least in part, to the impact of the independent variable. In other words, its value “depends” on the value of the independent variable. For example, in the variables “gender” and “academic major,” academic major is the dependent variable, meaning that your major cannot determine whether you are male or female, but your gender might indirectly lead you to favor one major over another.
• Deviation -- the distance between the mean and a particular data point in a given distribution.
• Discourse Community -- a community of scholars and researchers in a given field who respond to and communicate to each other through published articles in the community's journals and presentations at conventions. All members of the discourse community adhere to certain conventions for the presentation of their theories and research.
• Discrete Variable -- a variable that is measured solely in whole units, such as, gender and number of siblings.
• Distribution -- the range of values of a particular variable.
• Effect Size -- the amount of change in a dependent variable that can be attributed to manipulations of the independent variable. A large effect size exists when the value of the dependent variable is strongly influenced by the independent variable. It is the mean difference on a variable between experimental and control groups divided by the standard deviation on that variable of the pooled groups or of the control group alone.
• Emancipatory Research -- research is conducted on and with people from marginalized groups or communities. It is led by a researcher or research team who is either an indigenous or external insider; is interpreted within intellectual frameworks of that group; and, is conducted largely for the purpose of empowering members of that community and improving services for them. It also engages members of the community as co-constructors or validators of knowledge.
• Empirical Research -- the process of developing systematized knowledge gained from observations that are formulated to support insights and generalizations about the phenomena being researched.
• Epistemology -- concerns knowledge construction; asks what constitutes knowledge and how knowledge is validated.
• Ethnography -- method to study groups and/or cultures over a period of time. The goal of this type of research is to comprehend the particular group/culture through immersion into the culture or group. Research is completed through various methods but, since the researcher is immersed within the group for an extended period of time, more detailed information is usually collected during the research.
• Expectancy Effect -- any unconscious or conscious cues that convey to the participant in a study how the researcher wants them to respond. Expecting someone to behave in a particular way has been shown to promote the expected behavior. Expectancy effects can be minimized by using standardized interactions with subjects, automated data-gathering methods, and double blind protocols.
• External Validity -- the extent to which the results of a study are generalizable or transferable.
• Factor Analysis -- a statistical test that explores relationships among data. The test explores which variables in a data set are most related to each other. In a carefully constructed survey, for example, factor analysis can yield information on patterns of responses, not simply data on a single response. Larger tendencies may then be interpreted, indicating behavior trends rather than simply responses to specific questions.
• Field Studies -- academic or other investigative studies undertaken in a natural setting, rather than in laboratories, classrooms, or other structured environments.
• Focus Groups -- small, roundtable discussion groups charged with examining specific topics or problems, including possible options or solutions. Focus groups usually consist of 4-12 participants, guided by moderators to keep the discussion flowing and to collect and report the results.
• Framework -- the structure and support that may be used as both the launching point and the on-going guidelines for investigating a research problem.
• Generalizability -- the extent to which research findings and conclusions conducted on a specific study to groups or situations can be applied to the population at large.
• Grey Literature -- research produced by organizations outside of commercial and academic publishing that publish materials, such as, working papers, research reports, and briefing papers.
• Grounded Theory -- practice of developing other theories that emerge from observing a group. Theories are grounded in the group's observable experiences, but researchers add their own insight into why those experiences exist.
• Group Behavior -- behaviors of a group as a whole, as well as the behavior of an individual as influenced by his or her membership in a group.
• Hypothesis -- a tentative explanation based on theory to predict a causal relationship between variables.
• Independent Variable -- the conditions of an experiment that are systematically manipulated by the researcher. A variable that is not impacted by the dependent variable, and that itself impacts the dependent variable. In the earlier example of "gender" and "academic major," (see Dependent Variable) gender is the independent variable.
• Individualism -- a theory or policy having primary regard for the liberty, rights, or independent actions of individuals.
• Inductive -- a form of reasoning in which a generalized conclusion is formulated from particular instances.
• Inductive Analysis -- a form of analysis based on inductive reasoning; a researcher using inductive analysis starts with answers, but formulates questions throughout the research process.
• Insiderness -- a concept in qualitative research that refers to the degree to which a researcher has access to and an understanding of persons, places, or things within a group or community based on being a member of that group or community.
• Internal Consistency -- the extent to which all questions or items assess the same characteristic, skill, or quality.
• Internal Validity -- the rigor with which the study was conducted [e.g., the study's design, the care taken to conduct measurements, and decisions concerning what was and was not measured]. It is also the extent to which the designers of a study have taken into account alternative explanations for any causal relationships they explore. In studies that do not explore causal relationships, only the first of these definitions should be considered when assessing internal validity.
• Life History -- a record of an event/events in a respondent's life told [written down, but increasingly audio or video recorded] by the respondent from his/her own perspective in his/her own words. A life history is different from a "research story" in that it covers a longer time span, perhaps a complete life, or a significant period in a life.
• Margin of Error -- the permittable or acceptable deviation from the target or a specific value. The allowance for slight error or miscalculation or changing circumstances in a study.
• Measurement -- process of obtaining a numerical description of the extent to which persons, organizations, or things possess specified characteristics.
• Meta-Analysis -- an analysis combining the results of several studies that address a set of related hypotheses.
• Methodology -- a theory or analysis of how research does and should proceed.
• Methods -- systematic approaches to the conduct of an operation or process. It includes steps of procedure, application of techniques, systems of reasoning or analysis, and the modes of inquiry employed by a discipline.
• Mixed-Methods -- a research approach that uses two or more methods from both the quantitative and qualitative research categories. It is also referred to as blended methods, combined methods, or methodological triangulation.
• Modeling -- the creation of a physical or computer analogy to understand a particular phenomenon. Modeling helps in estimating the relative magnitude of various factors involved in a phenomenon. A successful model can be shown to account for unexpected behavior that has been observed, to predict certain behaviors, which can then be tested experimentally, and to demonstrate that a given theory cannot account for certain phenomenon.
• Models -- representations of objects, principles, processes, or ideas often used for imitation or emulation.
• Naturalistic Observation -- observation of behaviors and events in natural settings without experimental manipulation or other forms of interference.
• Norm -- the norm in statistics is the average or usual performance. For example, students usually complete their high school graduation requirements when they are 18 years old. Even though some students graduate when they are younger or older, the norm is that any given student will graduate when he or she is 18 years old.
• Null Hypothesis -- the proposition, to be tested statistically, that the experimental intervention has "no effect," meaning that the treatment and control groups will not differ as a result of the intervention. Investigators usually hope that the data will demonstrate some effect from the intervention, thus allowing the investigator to reject the null hypothesis.
• Ontology -- a discipline of philosophy that explores the science of what is, the kinds and structures of objects, properties, events, processes, and relations in every area of reality.
• Panel Study -- a longitudinal study in which a group of individuals is interviewed at intervals over a period of time.
• Participant -- individuals whose physiological and/or behavioral characteristics and responses are the object of study in a research project.
• Peer-Review -- the process in which the author of a book, article, or other type of publication submits his or her work to experts in the field for critical evaluation, usually prior to publication. This is standard procedure in publishing scholarly research.
• Phenomenology -- a qualitative research approach concerned with understanding certain group behaviors from that group's point of view.
• Philosophy -- critical examination of the grounds for fundamental beliefs and analysis of the basic concepts, doctrines, or practices that express such beliefs.
• Phonology -- the study of the ways in which speech sounds form systems and patterns in language.
• Policy -- governing principles that serve as guidelines or rules for decision making and action in a given area.
• Policy Analysis -- systematic study of the nature, rationale, cost, impact, effectiveness, implications, etc., of existing or alternative policies, using the theories and methodologies of relevant social science disciplines.
• Population -- the target group under investigation. The population is the entire set under consideration. Samples are drawn from populations.
• Position Papers -- statements of official or organizational viewpoints, often recommending a particular course of action or response to a situation.
• Positivism -- a doctrine in the philosophy of science, positivism argues that science can only deal with observable entities known directly to experience. The positivist aims to construct general laws, or theories, which express relationships between phenomena. Observation and experiment is used to show whether the phenomena fit the theory.
• Predictive Measurement -- use of tests, inventories, or other measures to determine or estimate future events, conditions, outcomes, or trends.
• Principal Investigator -- the scientist or scholar with primary responsibility for the design and conduct of a research project.
• Probability -- the chance that a phenomenon will occur randomly. As a statistical measure, it is shown as p [the "p" factor].
• Questionnaire -- structured sets of questions on specified subjects that are used to gather information, attitudes, or opinions.
• Random Sampling -- a process used in research to draw a sample of a population strictly by chance, yielding no discernible pattern beyond chance. Random sampling can be accomplished by first numbering the population, then selecting the sample according to a table of random numbers or using a random-number computer generator. The sample is said to be random because there is no regular or discernible pattern or order. Random sample selection is used under the assumption that sufficiently large samples assigned randomly will exhibit a distribution comparable to that of the population from which the sample is drawn. The random assignment of participants increases the probability that differences observed between participant groups are the result of the experimental intervention.
• Reliability -- the degree to which a measure yields consistent results. If the measuring instrument [e.g., survey] is reliable, then administering it to similar groups would yield similar results. Reliability is a prerequisite for validity. An unreliable indicator cannot produce trustworthy results.
• Representative Sample -- sample in which the participants closely match the characteristics of the population, and thus, all segments of the population are represented in the sample. A representative sample allows results to be generalized from the sample to the population.
• Rigor -- degree to which research methods are scrupulously and meticulously carried out in order to recognize important influences occurring in an experimental study.
• Sample -- the population researched in a particular study. Usually, attempts are made to select a "sample population" that is considered representative of groups of people to whom results will be generalized or transferred. In studies that use inferential statistics to analyze results or which are designed to be generalizable, sample size is critical, generally the larger the number in the sample, the higher the likelihood of a representative distribution of the population.
• Sampling Error -- the degree to which the results from the sample deviate from those that would be obtained from the entire population, because of random error in the selection of respondent and the corresponding reduction in reliability.
• Saturation -- a situation in which data analysis begins to reveal repetition and redundancy and when new data tend to confirm existing findings rather than expand upon them.
• Semantics -- the relationship between symbols and meaning in a linguistic system. Also, the cuing system that connects what is written in the text to what is stored in the reader's prior knowledge.
• Social Theories -- theories about the structure, organization, and functioning of human societies.
• Sociolinguistics -- the study of language in society and, more specifically, the study of language varieties, their functions, and their speakers.
• Standard Deviation -- a measure of variation that indicates the typical distance between the scores of a distribution and the mean; it is determined by taking the square root of the average of the squared deviations in a given distribution. It can be used to indicate the proportion of data within certain ranges of scale values when the distribution conforms closely to the normal curve.
• Statistical Analysis -- application of statistical processes and theory to the compilation, presentation, discussion, and interpretation of numerical data.
• Statistical Bias -- characteristics of an experimental or sampling design, or the mathematical treatment of data, that systematically affects the results of a study so as to produce incorrect, unjustified, or inappropriate inferences or conclusions.
• Statistical Significance -- the probability that the difference between the outcomes of the control and experimental group are great enough that it is unlikely due solely to chance. The probability that the null hypothesis can be rejected at a predetermined significance level [0.05 or 0.01].
• Statistical Tests -- researchers use statistical tests to make quantitative decisions about whether a study's data indicate a significant effect from the intervention and allow the researcher to reject the null hypothesis. That is, statistical tests show whether the differences between the outcomes of the control and experimental groups are great enough to be statistically significant. If differences are found to be statistically significant, it means that the probability [likelihood] that these differences occurred solely due to chance is relatively low. Most researchers agree that a significance value of .05 or less [i.e., there is a 95% probability that the differences are real] sufficiently determines significance.
• Subcultures -- ethnic, regional, economic, or social groups exhibiting characteristic patterns of behavior sufficient to distinguish them from the larger society to which they belong.
• Testing -- the act of gathering and processing information about individuals' ability, skill, understanding, or knowledge under controlled conditions.
• Theory -- a general explanation about a specific behavior or set of events that is based on known principles and serves to organize related events in a meaningful way. A theory is not as specific as a hypothesis.
• Treatment -- the stimulus given to a dependent variable.
• Trend Samples -- method of sampling different groups of people at different points in time from the same population.
• Triangulation -- a multi-method or pluralistic approach, using different methods in order to focus on the research topic from different viewpoints and to produce a multi-faceted set of data. Also used to check the validity of findings from any one method.
• Unit of Analysis -- the basic observable entity or phenomenon being analyzed by a study and for which data are collected in the form of variables.
• Validity -- the degree to which a study accurately reflects or assesses the specific concept that the researcher is attempting to measure. A method can be reliable, consistently measuring the same thing, but not valid.
• Variable -- any characteristic or trait that can vary from one person to another [race, gender, academic major] or for one person over time [age, political beliefs].
• Weighted Scores -- scores in which the components are modified by different multipliers to reflect their relative importance.
• White Paper -- an authoritative report that often states the position or philosophy about a social, political, or other subject, or a general explanation of an architecture, framework, or product technology written by a group of researchers. A white paper seeks to contain unbiased information and analysis regarding a business or policy problem that the researchers may be facing.

Elliot, Mark, Fairweather, Ian, Olsen, Wendy Kay, and Pampaka, Maria. A Dictionary of Social Research Methods. Oxford, UK: Oxford University Press, 2016; Free Social Science Dictionary. Socialsciencedictionary.com [2008]. Glossary. Institutional Review Board. Colorado College; Glossary of Key Terms. Writing@CSU. Colorado State University; Glossary A-Z. Education.com; Glossary of Research Terms. Research Mindedness Virtual Learning Resource. Centre for Human Servive Technology. University of Southampton; Miller, Robert L. and Brewer, John D. The A-Z of Social Research: A Dictionary of Key Social Science Research Concepts London: SAGE, 2003; Jupp, Victor. The SAGE Dictionary of Social and Cultural Research Methods . London: Sage, 2006.

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Research Paper Structure: The Complete Guide

A professional writer with ten years of experience and a Ph.D. in Modern History, Catharine Tawil writes engaging and insightful papers for academic exchange. With deep insight into the impact of historical events on the present, she provides a unique perspective in giving students a feel for the past. Her writing educates and stimulates critical thinking, making her a treasure to those wading through the complexities of history.

A research paper is an academic work depicting the design and results of a study. It can be an academic assignment in undergraduate and postgraduate programs. Moreover, it is an integral requirement in doctoral programs, where postgrads’ research papers are published in reputable journals to add credibility to their research findings. 

Ordering different parts of a research paper is critical for fulfilling academic standards, streamlining your writing, and avoiding distractions and sidetracks. Although outlining may seem like a waste of time, it is the most efficient use of your time at the pre-writing stage, as it will help you order your thoughts and ideas and develop a plan of action to follow throughout the study. 

In this post, we’ll cover the basics of the research paper formatting, provide a basic template of a research paper structure, and provide a detailed description of each section, including the title page and abstract, introduction and literature review, methodology, results, discussion, and conclusion. You can skip to a specific section if you have questions or concerns about it or check out the full article for an in-depth understanding of the full structure. 

Essential Components of a Research Paper

Unlike other types of academic assignments, research papers have a structure more complex than a simple trio of introduction, body, and conclusion. You are expected to follow the established academic norms and include specific information for your paper to have any scientific value. The basic research paper structure example comprises the following parts:

Introduction

• Literature review

Methodology

• Acknowledgments

Please note that some sections of a research paper outlined above are optional. For example, you only need to include appendices if you wish to share a large volume of data that would make the paper unwieldy. You can also adjust this research paper setup to fit your study and word count requirements better. For instance, you can combine the results and discussion sections or the introduction and literature review.

Formatting Requirements

Although the research paper structure is basically the same for all fields of study and topics, the papers can look drastically different when following research paper formatting guidelines of various formatting styles, be it Chicago, MLA, or APA. You must learn the appropriate style at the onset of the writing process, so remember to ask your academic advisor about it if there’s no mention of the formatting style within general requirements.

Once you know which research paper formatting style to use, get your hands on the relevant formatting guidebook. You can find most of the requirements online or sign out a book from a college library. Considering most formatting guidebooks are huge, focus on the main aspects that can make or break your paper, such as:

• Margins, font, and spacing. Most research paper format guidelines require 1-inch margins on all sides, a legible font of at least 12 pt, and double-spaced lines. 
• Page numbering. Requirements vary, but typically, you’ll need to include page numbers in the upper right-hand corner, half an inch from the corner.
• Headings and subheadings. Refer to MLA or APA handbooks to learn specific research paper headings requirements or ask your professor, as the guidelines differ greatly. 
• In-text citations and reference list. In most cases, research paper in-text citations require the name of the main author along with the page number or the publication year. Reference list formatting varies across different styles, but you can use automatic citation generators to speed up the formatting process.

With formatting requirements out of the way, let’s now focus on individual components of a research paper to help you understand what each section should contain to be well received.

Title Page and Abstract

The research paper title page format depends on the required formatting style:

• MLA does not require a separate title page (unless specifically requested). Instead, in the upper left-hand corner of the first page, type your name, your instructor’s name, course name, and date (each on a new line, double-spaced). After that, center the title of the page and include its text.
• APA requires a separate title page, which should include the title of the paper, your name and affiliation, as well as the course name and number, your instructor’s name, and the assignment’s due date. 

A research paper abstract is brief summary of the main points of the research paper. Depending on the formatting style, it can be from 100 to 250 words long, highlighting the research objective, key methodology, and results highlights. An abstract should help readers decide if your work is worth reading at a glance. 

An APA research paper organization requires an abstract on a separate page, with the “Abstract” heading and the paper’s summary (without indent). Below the abstract, type “Keywords:” (in italics) and list the keywords researchers would use to find your paper in the library or online. 

The opening section of the research paper outline gives students pause because they never know what the introduction should entail. If you’re stuck with writer’s block and don’t know how to start the paper, answer these four questions, and you’ll have all the major pieces necessary for the introduction:

• What’s the context of the problem? Open with a general view of the issue and its current state without going into too much detail (that’s what the literature review is for). The background information should fit within one or two paragraphs and lead directly to the next point. 
• What is the issue? The problem statement or question is the core of this part of the research paper structure. Think of it as a thesis statement for an essay. Everything you write in other sections of a research paper should always tie to your problem statement.
• How do you plan to solve the problem? You can formulate research objectives or hypotheses that your study will try to achieve or prove. Short papers typically have one hypothesis, while longer works usually have two or more related objectives.
• How will your study improve the issue? The answer can circle back to the background you laid out at the beginning of the research paper introduction and highlight the benefits (and potential drawbacks and limitations) of your research. It’s the major “selling point” of the study, which should explain why anyone should care about it. 

You can always leave the introduction for last and tackle it once the rest of the paper is done. That’s especially helpful if you use writer’s block as an excuse to procrastinate and put off writing other parts of a research paper.

Literature Review

The primary objective of a research paper literature review is to provide context and prove the relevance of your topic, as specified in the introduction. To that end, you need to find credible, objective, and relevant sources and synthesize any data pertaining to your research. It’s important to avoid simple paraphrasing or summarization of reference data and instead provide its analysis and synthesize your own hypothesis.

Aside from the similarities found in references, this part of the research paper structure should also focus on discrepancies, contradictions, and knowledge gaps. These will prove your study has merit and can resolve the existing issues. Moreover, the knowledge gaps will help lead up to your main research question, which you may repeat near the end of the literature review.

Depending on the topic of your study, you can organize the literature review:

• Chronologically. You can go from the oldest sources published to the latest or from the latest events to situations long past. This approach is often the easiest, but it doesn’t fit all topics and fields of study.
• Thematically. If you wish to cover two or more aspects of the issue, you can dedicate a subsection to each and analyze them together in the final subsection of the literature review. This is the most popular approach, as it can work for most topics.
• Methodologically. If you want to focus on the differences and similarities in research methodology, you can split the literature review into several subsections, devoting each one to a single methodology. This approach works for select subjects and can make the most of systemic studies. 

If you’re working on an empirical study, you can stop there, but if your work is mostly theoretical, this stage of the research paper writing process could also involve developing a theoretical framework. It will help put your findings and results into perspective.

Although it may seem simple at first glance, a literature review takes a long time, most of which you’ll spend looking for reliable sources. Luckily, you can easily outsource this task. All you need to do is say, “Write my paper for me”, and our experts will take over ASAP. 

The research paper methodology section is an integral part of the piece, as it helps ensure the reproducibility of your results and increases your credibility. This part should answer two main questions:

• What? What did your study involve? What resources, software, materials, or samples did you use? What were the ethical considerations of your research?
• How? How much time did your study take? How did you choose participants? How did you collect data and analyze it?

Keep these questions in mind when working out a research design, picking data collection procedures and analysis techniques. If you rely on standard methods, a quick description with a citation would be enough for the methodology part of the research paper structure. But if you employ a unique approach, make sure to describe it in minute detail to ensure anyone can repeat the process and achieve the same results. 

For obvious reasons, the methodology section will differ greatly depending on your field of study and topic. For example, qualitative and quantitative research methods are vastly different. At the same time, quantitative analysis of sociology or linguistics research will be nothing like analyzing blood tests for nursing students or analyzing the success of a marketing campaign for a business and management class. While the tools (i.e., programming language or table processing software) may be similar, the application will be different, and you should highlight these distinctions in your methodology section. 

Although you can put off working on this section of the structure of a research paper, it can be helpful to put your methodology on paper before embarking on the study. A clear idea of the protocols you plan to employ should keep your study on track and minimize methodological errors. 

The research paper results present the study findings as the ultimate product of your research. Instead of the raw data, you can present analysis results and visual aids in the form of tables, figures, and graphs, provide statistical analysis results, and refer interested readers to appendices containing raw data.

Remember to follow the formatting style requirements for tables and figures, which differ for APA and MLA. The same applies to lists and other visual aids. You should also ensure these materials do not destroy your paper’s readability. For example, a three-page table is much more difficult to grasp than a couple of charts highlighting the same data. Moreover, if you plan to present your findings on a poster or a PowerPoint presentation, it pays to work out the best way to present your insights that will fit all formats, including print and projection.

It’s important to draw the line between the results and discussion parts of the research paper structure. The first presents analysis, while the latter relies on interpretations (or implications) of that analysis. Understanding the distinction can be quite challenging, especially if you’re working out the structure of a research paper for the first time.

Discussion and Conclusion

The research paper discussion connects the introduction and research question with the study results. Instead of merely analyzing data, this section should explain whether your initial hypothesis was correct or not. Moreover, the final section, along with the research paper conclusion, should cover the implications of the findings and their potential practical and theoretical applications. This part can also include the limitations of the study and the need for further research if you feel that it could be useful.

It may seem counterproductive, but you shouldn’t shy away from shortcomings, mistakes, and negative results achieved in your study. Instead of waiting for uncomfortable questions from your instructor, present the bad along with the good and hypothesize potential ways of correcting errors or minimizing the negative influences. In some cases, negative results can be just as valuable (if not more so) than positive findings.

Remember to include the research paper references and appendices after the conclusion to wrap up your work and make it better with careful editing, proofreading, and formatting.

What is the purpose of a research paper?

The main objective is to present and share research insights and discoveries, which you should account for when structuring a research paper. Adding literature review and methodology sections is critical for highlighting the study’s relevance and ensuring its reproducibility.

How do I structure the different sections of a research paper?

Structuring a research paper means adding an introduction, literature review, methodology, results, discussion, and conclusion. You can organize each of these sections thematically or chronologically or use a funnel structure, going from the broad context strokes to a narrow view of the problem.

What are the key formatting guidelines for a research paper?

Specific requirements for the structure of a research paper outline and its contents depend on the preferred formatting style. However, at its core, each formatting style focuses on readability. That’s where 12 pt to 14 pt font size and double line spacing come from. Refer to the relevant formatting style handbook for specific recommendations. 

How do I effectively write the introduction and literature review?

The introduction is a critical part of the research paper structure that should include your primary research objective (or question), hypotheses, and the study’s relevance. A literature review is designed to support the claims you make within the introduction by generously using reference data. 

What is the difference between the results and discussion sections?

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13 Examples of Supplementary Materials for Academic Journal Papers

13 Examples of Supplementary Materials for Academic Journal Papers Academics and scientists include many different kinds of supplementary materials when they submit research papers for publication in scholarly journals, and they do so now more than they ever have in the past. Today’s electronic journals offer online space for storing supplementary materials of virtually every kind and making them readily accessible for readers, and the increasing number of submissions received by many journals means that shortening papers by relegating supportive but unessential material to a supplementary position is extremely appealing. It is therefore fashionable to include supplementary materials with a research manuscript submitted to a journal for consideration. It can also be beneficial, but only if an author sends the sort of materials that the journal encourages and allows, and scholarly journals differ in this regard. Consulting the author instructions or guidelines of the target journal is therefore as essential before preparing your supplementary files for submission as it is before preparing the paper itself. Fairly common among journals is the conception of supplementary materials as informative resources that are directly related to the main paper and supportive of the arguments and conclusions presented there, yet not absolutely essential to an understanding of those arguments and conclusions. Definitions do vary, however, so make sure that you understand exactly what the journal considers valid supplementary materials. Terminology varies as well, so what I am referring to as supplementary materials may be called supplemental material, auxiliary information, supporting documents, online resources, archival content, extra data or something similar. Most journals will also specify the file formats preferred or required, with some wanting a separate file for every bit of information and others asking authors to arrange all supplementary materials in a single file, for which a template may even be supplied. The general concern across journals tends to be effective and lasting accessibility for readers, so the use of common file types of a reasonable size is a particularly frequent request in journal guidelines. Finally, some journals will have supplementary materials peer reviewed and copyedited, whereas others will leave it to authors to ensure the quality of their supportive documents. PhD Thesis Editing Services Although there is considerable overlap in the types of supplementary materials scholarly journals accept, each one tends to prioritise certain kinds of information and forms of presentation. The discipline or specialisation of the journal, its publishing aims and scope, and its capacity to share supplementary materials with its readers all play a part in its preferences. Generally speaking, however, the examples of supplementary materials described in the following list will be appropriate for many journals, but certainly not all of these materials will be appropriate for every journal or indeed every paper, and the list is not exhaustive, so a journal’s instructions for supplementary materials should always be consulted and prioritised.

Examples of Supplementary Materials

• Detailed descriptions of methodology or materials and methods. The basics about methodology should usually still be presented in the main paper to ensure that readers understand the research, but the details necessary for other researchers to replicate the work can be supplementary. • Raw data, data sets and databases used, created or contributed to in the research for an article. These may be uploaded to a journal’s supplementary materials section, but if they are very large, a description along with links to the information instead of the information itself may be preferred. • Tables of data to support the research findings reported in the paper. The main trends of a researcher’s results may be discussed using graphs and charts in the paper, but the detailed data on which they are based can be supplementary resources. Be sure to provide table headings and number each table as supplementary (using an ‘S’) to distinguish it from tables in the main paper (e.g., Table S1, Table S2 etc.). • Figures such as charts, graphs and images that exceed the number allowed or are too large or cumbersome for the paper itself. Whereas space is usually limited in journal issues and volumes and colour printing can be enormously expensive, large and colourful figures and photos can usually be accommodated with ease as supplementary online materials. Be sure to provide a caption or legend for each figure or image and use an ‘S’ when numbering supplementary figures to distinguish them from figures in the main paper (e.g., Figure S1, Figure S2 etc). • Video clips, movie files or animations that show research procedures, conditions, responses, projections and reconstructions in ways words alone cannot. Some journals will allow links to clips and animations available elsewhere online, while others will want to have the files uploaded to the journal site for readers to view them. • Audio or sound files that provide information or evidence directly related to the main paper that cannot be presented effectively in text. A linguistic study, for instance, might have supplementary recordings of dialects or pronunciation patterns that enhance the textual descriptions and discussions in the paper. • Software applications and code for data-analysis software or computer simulation of models. These are beneficial for other researchers who wish to apply the methods to their own data or replicate the analysis and simulations, but their size may necessitate linking to another repository rather than including them among the supplementary files. • Case studies and other examples of the practices, behaviours and events observed and studied in the main paper. Placing thorough information about specific examples in supplementary materials and mentioning only the most revealing or persuasive examples in the paper can leave more room for discussion. • Questionnaires, surveys, forms, quizzes and other information-gathering instruments used in the research for the paper. Allowing your readers to see an instrument exactly as your research participants did can deepen their understanding and also enable you as the author to focus on the most important responses in the paper itself. • Translations of passages of foreign languages that are discussed in the paper or passages of the original languages that are translated in the paper. The knowledge and expertise of the anticipated audience should determine whether a translation or the original language is used in the paper itself and therefore in the supplementary materials. • Any text that presents more detail, description or information about the background, processes, experiments, trials, conditions, controls, interventions, participants, sites, observations, findings, arguments and conclusions of the research presented in the article. Some journals are far stricter than others about the kind of supplementary text allowed, so extra discussion and argumentation may not be possible. • Anything that might be included in a traditional appendix if there were space for one in the main paper. Text, tables, photos, sketches, graphs, charts, maps and more can be included, and they might even be arranged in one or more appendices for readers. PhD Thesis Editing Services • A list of all the supplementary materials and files included with a manuscript submission. This is usually required in some form by scholarly journals, though it can appear in a variety of places such as above or below the paper’s reference list or along with the paper title in the journal’s table of contents. It is also usually a good idea if not a requirement to describe or list any supplementary materials in your cover letter along with an explanation of why they have been included with the paper.

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Our scientific proofreading services for the authors of a wide variety of scientific journal papers are especially popular, but we also offer manuscript proofreading services and have the experience and expertise to proofread and edit manuscripts in all scholarly disciplines, as well as beyond them. We have team members who specialise in medical proofreading services , and some of our experts dedicate their time exclusively to PhD proofreading and master’s proofreading , offering research students the opportunity to improve their use of formatting and language through the most exacting PhD thesis editing and dissertation proofreading practices. Whether you are preparing a conference paper for presentation, polishing a progress report to share with colleagues, or facing the daunting task of editing and perfecting any kind of scholarly document for publication, a qualified member of our professional team can provide invaluable assistance and give you greater confidence in your written work.

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How to Introduce Evidence: 41 Effective Phrases & Examples

Research requires us to scrutinize information and assess its credibility. Accordingly, when we think about various phenomena, we examine empirical data and craft detailed explanations justifying our interpretations. An essential component of constructing our research narratives is thus providing supporting evidence and examples.

The type of proof we provide can either bolster our claims or leave readers confused or skeptical of our analysis. Therefore, it’s crucial that we use appropriate, logical phrases that guide readers clearly from one idea to the next. In this article, we explain how evidence and examples should be introduced according to different contexts in academic writing and catalog effective language you can use to support your arguments, examples included.

When to Introduce Evidence and Examples in a Paper

Evidence and examples create the foundation upon which your claims can stand firm. Without proof, your arguments lack credibility and teeth. However, laundry listing evidence is as bad as failing to provide any materials or information that can substantiate your conclusions. Therefore, when you introduce examples, make sure to judiciously provide evidence when needed and use phrases that will appropriately and clearly explain how the proof supports your argument.

There are different types of claims and different types of evidence in writing. You should introduce and link your arguments to evidence when you

• state information that is not “common knowledge”;
• draw conclusions, make inferences, or suggest implications based on specific data;
• need to clarify a prior statement, and it would be more effectively done with an illustration;
• need to identify representative examples of a category;
• desire to distinguish concepts; and
• emphasize a point by highlighting a specific situation.

Introductory Phrases to Use and Their Contexts

To assist you with effectively supporting your statements, we have organized the introductory phrases below according to their function. This list is not exhaustive but will provide you with ideas of the types of phrases you can use.

Although any research author can make use of these helpful phrases and bolster their academic writing by entering them into their work, before submitting to a journal, it is a good idea to let a professional English editing service take a look to ensure that all terms and phrases make sense in the given research context. Wordvice offers paper editing , thesis editing , and dissertation editing services that help elevate your academic language and make your writing more compelling to journal authors and researchers alike.

For more examples of strong verbs for research writing , effective transition words for academic papers , or commonly confused words , head over to the Wordvice Academic Resources website.

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• Published: 26 May 2024

Simulation and optimization of 30.17% high performance N-type TCO-free inverted perovskite solar cell using inorganic transport materials

• Emmanuel A. Nyiekaa 1 , 4 ,
• Timothy A. Aika 1 ,
• Eli Danladi 2 ,
• Christopher E. Akhabue 3 &
• Patience E. Orukpe 1  

Scientific Reports volume  14 , Article number:  12024 ( 2024 ) Cite this article

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• Materials science
• Nanoscience and technology

Perovskite solar cells (PSCs) have gained much attention in recent years because of their improved energy conversion efficiency, simple fabrication process, low processing temperature, flexibility, light weight, and low cost of constituent materials when compared with their counterpart silicon based solar cells. Besides, stability and toxicity of PSCs and low power conversion efficiency have been an obstacle towards commercialization of PSCs which has attracted intense research attention. In this research paper, a Glass/Cu 2 O/CH 3 NH 3 SnI 3 /ZnO/Al inverted device structure which is made of cheap inorganic materials, n-type transparent conducting oxide (TCO)-free, stable, photoexcited toxic-free perovskite have been carefully designed, simulated and optimized using a one-dimensional solar cell capacitance simulator (SCAPS-1D) software. The effects of layers’ thickness, perovskite’s doping concentration and back contact electrodes have been investigated, and the optimized structure produced an open circuit voltage (V oc ) of 1.0867 V, short circuit current density (J SC ) of 33.4942 mA/cm 2 , fill factor (FF) of 82.88% and power conversion efficiency (PCE) of 30.17%. This paper presents a model that is first of its kind where the highest PCE performance and eco-friendly n-type TCO-free inverted CH 3 NH 3 SnI 3 based perovskite solar cell is achieved using all-inorganic transport materials.

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Device simulation of highly efficient eco-friendly CH3NH3SnI3 perovskite solar cell

Introduction.

Due to the enormous energy demand brought on by the growing world population, energy consumption is increasing at fast rate every day. Fossil fuels provide about 80% of the world’s energy requirements 1 , which have negative environmental effects and have forced the development of renewable energy sources 2 . Because of its abundant, clean, and limitless nature, solar energy is regarded as the most major and significant source of renewable energy 3 , making it the most promising contender because of its affordability and sustainability 4 . The generations of solar cells is recently categorized into four; the crystalline silicon (c-Si) and gallium arsenide (GaAs) constitute the first generation, while the thin films such as copper indium gallium selenide (CIGS), amorphous silicon (a-Si) and cadmium telluride (CdTe), formed the second generation. The evolving class of solar cells such as dye-sensitized solar cells (DSSC), copper zinc tin sulfide (CZTS) and quantum dot (QD) belongs to the third generation while the novel solar cells recognized as “inorganics-in-organics” such as hybrid perovskites represents one of the candidates of fourth-generation solar cells 5 . The monocrystalline and polycrystalline silicon-based are the known two kinds of solar cells 6 . Solar cells based on CdTe 7 , 8 , quantum dot sensitized-based solar cells 9 , CIGS 10 , 11 , organic photo cells 12 and perovskite-based solar cells 13 have also been explored by researchers.

The metal halide perovskites are represented by ABX 3 , where A refers to an organic cation, B refers to a metal cation, and X refers to a halogen anion. The cation embraces individual or mixed compositions of methylammonium (MA), cesium (Cs), and formamidinium (FA), whereas the halogen anion embraces individual or mixed compositions of Cl, Br, and I 14 . Recent researches have focused on perovskite solar cells (PSCs), due to their increased efficiencies 15 , low processing temperatures, high absorption, long diffusion length, high charge mobility, low trap density, low exciton binding energy, tunable bandgap and low-cost of fabrication 14 , 15 . PSCs have been the subject of numerous studies, which have improved energy power conversion efficiencies (PCEs) from 3.8% in 2009 to about 25% after 13 years of development 16 , while 15 reported PCE of 25.6%, and 26.1% have recently been attained 17 . The impressive characteristics of perovskite materials include good charge carrier mobility, high coefficient of absorption, high diffusion charge carrier and low binding energy 18 , 19 . Because of their excellent photovoltaic performance, methyl ammonium lead halides, both pure and modified, have been the subject of several studies 20 , 21 . However, lead-based electronics posed hindrance to commercialization due to its harmful nature 14 , 22 , 23 , 24 . Recent reports revealed stern circumscribe of lead-based electronics devices by many countries, notably the European Union because of its toxic nature to human and environment irrespective of their high-power conversion efficiency 25 , 26 , 27 , 28 .

Some of the major challenges affecting the large-scale production of PSCs is the high cost of electron and hole transport materials, toxicity of the perovskite materials and degradability of the solar cells. Despite significant improvements made thus far, high temperature and humidity as well as the presence of moisture results to reduced lifespan of some perovskite materials such as Spiro-OMeTAD, the popular hole transport material. The difficulty in processing, and the expensive nature of Spiro-OMeTAD is a possible impediment to commercialization of PSCs going forward 29 , 30 , 31 , 32 . Additionally, the Spiro-OMeTAD layer aids polarisation of the electrode and plays a significant part in the current density–voltage (J–V) hysteresis phenomenon, which ultimately influence the device’s instability 33 . Conventional structures of PSCs using organic-based materials as hole transport medium and the metallic electrodes constitute the major reasons for the PSCs’ shorter life span 34 . Pin-holes in the HTM have been a challenge of interest in recent studies as it leads to poor PSC’s stability owing to penetration of oxygen and ambient moisture which deteriorates the perovskite absorbent layer. Numerous attempts have been made to address the detrimental effects of pinholes in HTMs and perovskites. One of such efforts is the significant improvement of stability in perovskite solar cells through the use of doping engineering to create a hole transport layer free of pinholes 35 . Investigations by other scientists have concentrated on creating effective PSCs employing novel kinds of hole-transport materials as replacement to Spiro-OMeTAD 36 , 37 , or PSCs without HTL that are suitable for streamlining the device’s ideal process, and further reduce manufacturing cost and as well prevents perovskite’s degradation 38 , 39 , 40 . There is no doubt that the absence of pinholes in HTM layer considerably increases the PSC’s device stability under operating environments 41 .

Regardless of tremendous research progresses in PCSs, planar inverted PSCs have received lesser interest, hence limited research work is conducted in this area of study despites their easy fabrication, cost-effectiveness, and suppressed hysteresis characteristics 42 . Therefore, intense study is required in this field of study to improve and maximize their performances as compared to their conventional counterparts’ structures. Most of the available researches on inverted planar PSCs have focused on the use of gold as contact electrode, spiro-OMeTAD as HTM with a maximum achievable PCE of approximately 30% through simulations 43 , 44 , 45 , 46 , 47 .

This research sought to streamline production innovations in PSCs, lower production costs, and maximise performance. The use of eco-friendly perovskite material, cheap and suitable all-inorganic transport materials and the use of the appropriate back contact electrode will increase efficiency, stability, and significantly reduce the production costs. The possibility of attaining high efficiency by utilising the inverted planar technique without using silicon composites and organic HTMs can lead to a greater variety of benefits in the sector. This paper presents a simulation of an inverted planar and n-type transparent conducting oxide-free structure using inorganic transport materials. The selection of appropriate back contact electrode, variation of system’s parameters such as thickness of HTM, absorber material, ETM, absorber doping concentration and determination of optimal values of series and shunt resistances is carried out to achieve optimal performance of the device.

Materials and methods

Device structure and simulation.

There are different types of software used for simulation of solar cells such as PC1D, ASA, Amps-1D, WxAMPS, SCAPS-1D, SETFOS, Gpvdm, AFORS-het, Aspin-2D, PECSIM, Adept, TCAD, Atlas, Silvaco etc. However, SCAPS-1D software is used in this work to simulate an inverted tin-based perovskite solar cell with planar heterojunction because of its best accurate non-commercial tool that is straightforward in operation, with friendly dialog box and extremely quick in simulations at no additional expense and support for multi-junction solar cells 48 . Three related differential equations were solved to determine the energy bands, quantum efficiency of the device, current density–voltage (J–V) curve, and recombination rate curve. The Poisson Eq. ( 1 ), the electron continuity Eq. ( 2 ), and the hole Eq. ( 3 ) are built in the SCAPS-1D software. These curves are used to compute the solar cell device’s open circuit voltage (V oc ), short circuit current density (J SC ), fill factor (FF), and power conversion efficiency (PCE).

where \(G\) , \({\tau }_{n}\) , \({\tau }_{p},\) \(D\) , \(q\) , \(\varepsilon\)    \(\psi,\) \({\mu }_{n}\) , \({\mu }_{p}\) , \(n\left(x\right), p\left(x\right),\) \({n}_{t}(x)\) , \({p}_{t}\left(x\right),\) \({N}_{A}^{-}(x),\) \({N}_{D}^{+}\left(x\right)\) and \(E\) represent the rate of generation, life time of electron, life time of hole, diffusion coefficient, electron charge, permittivity, electrostatic potential, electron mobility, hole mobility, concentration of free electrons, concentration of free holes, concentration of trapped electrons, concentration of trapped holes, ionized acceptor concentrations, ionized donor concentrations, and electric field respectively. Meanwhile, x represents the direction along the thickness of the solar cell 49 .

The device’s structure is composed of Cu 2 O as HTM layer, CH 3 NH 3 SnI 3 as absorber layer and ZnO as ETM layer. The choice of Cu 2 O as HTM in this work over other HTMs is based on the fact that it is relatively cheap when compared to organic based HTMs, high absorption coefficient, high intrinsic hole mobility, and acceptable energy levels that are aligned with the absorber layer (MASnI 3 ), high photochemical and thermal stability as well as long-term stability in air 50 . Similarly, CH 3 NH 3 SnI 3 is also adopted as the absorber layer because of its eco-friendliness with potentials for commercialization 51 , 52 and superior optoelectronic properties with 1.3 eV direct band gap, which is an appropriate range for the absorber layer 21 , 49 , 53 , 54 . Meanwhile, ZnO is used as ETM because of its high absorption coefficient, higher electron mobility 2 , 51 and aligned energy bandgap with the chosen perovskite (MASnI 3 ) when compared to the SnO 2 36 .

Background and selection of device parameters

Light generates electron–hole pairs within the absorber layer. The junction field draws holes to the HTM layers and electrons to the ETM layers, respectively. The thickness, coefficient of absorption, and mobility of the active material all affect the device’s J SC . The photocurrent will increase as the absorption coefficient increases 49 , 54 , 55 . Another important consideration is the absorber’s thickness, which must be sufficient to absorb the maximum cutoff wavelength of the incident solar light 49 , 53 . Aside from that, mobility is essential to achieving the high J SC which is ideally equal to the current in the solar cell. For the sample of CH 3 NH 3 SnI 3 produced using the open tube approach, a very high mobility of electrons (2000 cm 2 /Vs) and holes (300 cm 2 /Vs) was discovered by Ma et al. and Stoumpos et al. 56 , 57 . Lazemi et al. reported a high value of J SC using similar values of carrier mobility 53 . Devi et al. 58 and Khattak et al. 59 have taken into account the equal and noticeably lesser values of the electron and hole mobility, which are 1.6 cm 2 /Vs and 0.16 cm 2 /Vs respectively. In line with experimental work done by 60 , the electron (2000 cm 2 /Vs) and hole (300 cm 2 /Vs) mobility values for CH 3 NH 3 SnI 3 is adopted for use in this study. It is important to note that diffusion length also has a proportionality relationship to the square root of mobility 58 .

The device simulation was conducted under the 1000 W/m 2 light illumination at 300 K temperature and 1.5G air mass. The proposed device’s series resistance was adjusted to 1 Ωcm 2 while the shunt resistance at 10 4 Ωcm 2 during simulation. The value of work function for front electrode (Cu 2 O) is 5.0 eV while the surface recombination velocity for electrons and holes as 10 5  cm/s and 10 7  cm/s respectively. Moreover, the work function for the back contact electrode ticked as flat band with surface recombination velocity for electrons and holes as 10 7  cm/s and 10 5  cm/s respectively at the beginning of the simulation until an optimized back contact electrode work function was determined as discussed in section " Effect of back contact electrode on the proposed inverted perovskite solar cell ". The characteristics of the device’s material parameters adopted were carefully selected from theories, experiments and research reviews is presented in Table 1 , while the interface parameters are presented in Table 2 . Scientifically, the neutral defect type adopted in the simulation means non-reactive, which can further be explained as a situation where there is no donor nor acceptor of charges within the films of a layer or interface. The bulk defect densities of the materials were chosen above ideal values to demonstrate ideal experimental conditions.

Various decisive parameters like electron mobility, hole mobility, carrier diffusion length, interfacial resistance, etc., have been considered constant and taken from the literature. These parameters are extremely dependent on experimental processes and can hugely alter practical performance of the device. The relative humidity, temperature, the type of instruments used, procedural and human expertise, control of crystallization and grain growth rates are some of the factors behind the real-life performance and their variations from theoretical values.

Results and discussions

In general, the electron and hole pairs are produced within the absorber layer after illumination. The junction field causes holes and electrons to travel in the directions of HTM and ETM layers, respectively. A voltage is created when these holes and electrons are collected at the anode and cathode, respectively. The simulation results of the proposed inverted device structure Cu 2 O/CH 3 NH 3 SnI 3 /ZnO using the available initial device parameters as contained in Tables 1 and 2 shows the J–V characteristics of the proposed device as shown in Fig.  1 produced a Voc of 0.9854 V, J SC of 30.4185 mA/cm 2 , an FF of 82.48% and PCE of 24.72%. The proposed device structure Cu 2 O/MASnI 3 /ZnO underwent further simulation and optimization so as to obtain optimized thickness of the constituent layers.

Effect of different back metal contact electrodes on parameters of the proposed IPSC. ( a ) Plot of V OC against metal work function, ( b ) Plot of J SC against metal work function, ( c ) Plot of FF against metal work function, ( d ) Plot of PCE against metal work function.

Effect of back contact electrode on the proposed inverted perovskite solar cell

Various metal back contact electrodes such as aluminium (4.26 eV), tin (4.42 eV) graphene (4.60 eV), silver (4.74 eV), iron (4.81 eV) and copper (5.00 eV) have been tested on the proposed inverted structure so as to determine the most appropriate one to be used for enhanced optimal performance. Figure  1 shows the work function of various metals used as back contact electrodes and their associated photovoltaic parameters on the proposed IPSC based device simulated using initial given parameters presented in Tables 1 and 2 . The results in Fig.  1 clearly show that the choice of aluminum (Al) for back electrode maintained the most optimal device performance, as the V oc , J SC , FF and PCE of 0.9854 V, 30.4185 mA/cm 2 , 82.48% and 24.72% respectively is produced. It is interesting to note in this model that the J SC (Fig.  1 b) remains constant as the work function of the back contact varies while the V OC , FF and PCE declines as the work function increases from 4.26 to 5.00 eV (Fig.  1 a,c,d). For p–n configuration, the current is negative because of the uphill diffusion of the minority charge carriers in terms of concentration gradient arising from reverse bias during solar illumination. The current growth from the negative quadrant towards the positive quadrant signifies power generation up to zero value of current where an open circuit voltage (V OC ) of 0.9854 V is achieved. The J–V characteristics of the device having used aluminum as the back contact electrode is shown as Fig.  2 .

J–V Characteristics of the proposed inverted perovskite solar cell with initial parameters using MASnI 3 as absorber material, Cu 2 O as HTM, ZnO as ETM and Al as back contact respectively.

Effect of n-type TCO-free on inverted perovskite solar cell architecture.

There is no experimental result for this exact structure (Cu 2 O/CH 3 NH 3 SnI 3 /ZnO/Al) known to us, which makes this research novel and interesting. There is no clear reasons why the lack of experimental works to support this study, but this could be due to lack of good conductivity of all-inorganic transport materials in nano electronics compared to organic transport materials and high processing temperature required. However, there are few simulation results of exact combination in n–i–p structure reported in 63 , 64 . The PCEs of 26.55% and 9.27% respectively were obtained in 63 and 64 , while our designed n-type TCO-free p-i-n device produced a superior PCE of 30.17% as shown in Fig.  8 .

The proposed inverted model will not simulate when the conventional n-type TCO (ITO/FTO) of donor concentration ND is used with the acceptor concentration NA being zero, except an organic p-type TCO is used which is outside the scope of this study. It’s worth noting that the top transparent glass used as presented in Fig.  16 is an n-type TCO-free substrate in order to avoid non-convergence of voltage between the front and back electrodes when a conventional n-type TCOs are used. The carefully chosen transparent glass substrate size of 50 nm is not included in the simulation model, hence it is undoped and may not have significant impact on the device in real experimental situation. In this work, it is difficult to drive an output from the device if a TCO of an n-type material (FTO/ITO) is used as front electrode in the inverted structure when the same n-type material of same polarity is used as back hole blocker (ZnO) because of non-voltage convergence arising from non-compatible work function between the layers. The non-voltage convergence experienced when ITO with metal function of 4.7 eV is used is as a result of non-ideal band gap between the adjacent semiconductors layers (ITO/Cu 2 O) which makes the proposed n-type TCO-free model feasible. However, a back contact electrode of low metal function lower than ZnO like aluminium (4.26 eV) is required for optimal performance.

The use of Cu 2 O as front contact electrode may suffer setback due its high sheet resistance and poor conductivity when compared to n-type TCOs. However, the sheet resistance of most metal oxides depends on the method of deposition, temperature, oxygen flow rate and thickness of the films. The control of power and oxygen flow rates during deposition of copper oxide thin films at a thickness of less than 100 nm prepared by reactive magnetron sputtering can reduce the sheet resistance and enhance performance of the device in practical sense 65 . The provision of a high density of low energy sputtered copper radicals/ions, and when combined with a controlled amount of oxygen, can produce good quality p-type transparent Cu 2 O films with electrical resistivity ranging from 10 2 to 10 4  Ω-cm 66 which makes Cu 2 O a potential transparent front conducting oxide for photovoltaic applications. Also, the doping of Cu 2 O with nickel can improve its p–type conductivity via extrinsic doping and post–growth processing 67 . Therefore, the Cu 2 O may not be as conductive as other n-type TCOs in experimental sense but runs conveniently in the simulation model without challenge which means the proposed n-type TCO–free model is novel and less complex, providing good direction in the design and modeling of simple inverted perovskite solar cells as shown in Figs. 13 and 16 . Cu 2 O can act as a front electrode efficiently provided its thickness is thin enough to ensure adequate clarity and transparency to enhance admittance of photons into the absorber (perovskite) layer.

Effect of thickness of the HTM (Cu 2 O), absorber (CH 3 NH 3 SnI 3 ) and ETM (ZnO) layers

In this study, the variation of HTM’s layer thickness from 10 to 100 nm results to a slight increase in FF (Fig.  3 c) while a decline in device parameters such as V OC , J SC and PCE is experienced as presented in Fig.  3 a,b,d respectively.

Effect of variation of thickness of the HTM layer (Cu 2 O) on solar cell parameters. ( a ) Plot of V OC against thickness, ( b ) Plot of J SC against thickness, ( c ) Plot of FF against thickness, ( d ) Plot of PCE against thickness.

The thickness of the absorber layer considerably affects the solar cell’s overall performance. The increase in absorber’s thickness decreases the V OC due to increase in series resistance. Meanwhile, the increase in absorber’s thickness increases the J SC, FF and PCE to the maximum after which it decreases with further increase in thickness. In this study, the thickness of CH 3 NH 3 SnI 3 has been adjusted in this simulation from 100 to 1500 nm. The fluctuation of photovoltaic characteristics with thickness of absorber layer is shown in Fig.  4 . The V OC declines as a result of faster recombination due to increased thickness (Fig.  4 a). A thicker absorber layer absorbs more photons, which increases short circuit current density (J CS ) and the fill factor (FF) and as seen in Fig. 4 b,c, respectively. The solar cell efficiency is increased as the thickness of absorber layer increases up to an ideal thickness for the solar cell after which efficiency declines (Fig.  4 d). However, as diffusion necessitates a longer charge travel distance, recombination is more common in larger absorber layers; hence, efficiency decreases after a certain thickness value. Our results concur with experimental findings in 62 , 68 . As shown in Fig.  4 d, the ideal absorber layer thickness for this inverted PSC is achieved between 1200 and 1300 nm.

Effect of variation of thickness of the absorber layer (MASnI 3 ) on solar cell parameters. ( a ) Plot of V OC against thickness, ( b ) Plot of J SC against thickness, ( c ) Plot of FF against thickness, ( d ) Plot of PCE against thickness.

Nevertheless, the increase in ETM’s thickness leads to a non-noticeable change in V OC , J SC , FF and PCE (Fig.  5 a–d) respectively. Therefore, it can be inferred that while device performance is mostly determined by absorber thickness, IPSC device performance is not influenced by the ETM layer’s thickness but rather varies slightly with the HTM’s thickness, which is designed to be small enough to guarantee optical transparency and ensure easy photon penetration to the absorber layer. The selection of optimal thickness is important to regulate series and shunt resistance and ensure improved device performance in terms of short circuit current, open circuit voltage, fill factor and power conversion efficiency.

Effect of variation of thickness of the ETM layer (ZnO) on solar cell parameters. ( a ) Plot of V OC against thickness, ( b ) Plot of J SC against thickness, ( c ) Plot of FF against thickness, ( d ) Plot of PCE against thickness.

Simulation and thickness optimization of the proposed device structure

Simulation and optimization of the proposed device shows that the HTM (Cu 2 O) layer, the absorber (MASnI 3 ) layer and ETM layer (ZnO) have been optimized to the thickness of 40 nm, 1200 nm and 200 nm respectively. The simulation of these optimized dimensions led to an improvement in the solar cell parameters as it produced a Voc of 0.9633 V, J SC of 33.8049 mA/cm 2 , FF of 82.84% and PCE of 26.97% as shown in the J–V characteristics curve (Fig.  6 ).

J–V characteristics of the optimized device’s thickness using MASnI 3 as absorber material, Cu 2 O as HTM, ZnO as ETM and Al as back contact respectively.

Effect of absorber’s doping concentration (NA)

The holes’ acceptor density of the absorber layer has a major impact on the photovoltaic cell’s device performance in addition to its thickness. As demonstrated in Fig.  7 , the Fermi energy level of the hole falls with increasing doping concentration of the acceptor, and as a result, V OC increases (Fig.  7 a). Also, an increase in the doping concentration of the acceptor leads to a built-in potential that increases charge separation, which in turn causes a rise in V OC . In this work, the acceptor concentration NA (1/cm 3 ) of the absorber layer is varied within a range of 3 × 10 14  cm −3 to 3 × 10 21  cm −3 to ascertain the most optimal value that can produce an optimal performance of the proposed device. Nevertheless, J SC maintains a steady decline marginally up to NA’s value of 3 × 10 19  cm −3 before falling off sharply. At the same NA’s value, the value of FF drops suddenly which might be caused by a rise in the rate at which charge carriers within the absorber layer recombine or an increase in series resistance 55 . The absorber layer’s doping concentration value of 3 × 10 19  cm −3 produced the best cell performance having V oc of 1.0867 V, J SC of 33.4942 mA/cm 2 , FF of 82.88% and PCE of 30.17% as shown in Fig.  7 a–d respectively, while its J–V characteristics is shown as Fig.  8 .

Effect of variation of doping concentration of the absorber (CH 3 NH 3 SnI 3 ) on solar cell parameters. ( a ) Plot of V OC against doping concentration (NA), ( b ) Plot of J SC against doping concentration (NA), ( c ) Plot of FF against doping concentration (NA), ( d ) Plot of PCE against doping concentration (NA).

J–V Characteristics of the final optimized inverted simulated solar cell device using MASnI 3 as absorber material, Cu 2 O as HTM, ZnO as ETM and Al as back contact respectively.

The complex nature of an organic molecule in the A site of the perovskite structure (ABX 3 ) may be the cause of degradation, as evidenced by the absorber’s bandgap of 1.3 eV and the measured Voc of 1.0867 V. Using varying ratios of the precursors causes an intrinsic fault when the perovskite structure is distorted. Higher degrees of crystallization and a slower rate of breakdown are the results of vacancies in the structure caused by the excess CH 3 NH 3 I (MAI). The crystalline lattice’s anomalies emphasize the role MAI plays in the deterioration process. Excess MAI may potentially release halide ions, depending on the concentration. Afterwards, these halide ions function as dopants, altering the perovskite semiconductors' bandgap 69 . When exposed to air, the Sn 2+ in CH 3 NH 3 SnI 3 is changed to Sn 4+ (a process known as self-doping), converting the device into a p-type semiconductor. Sadly, this procedure deteriorates the device performance, such as the output power and the power conversion efficiency 56 , 70 .

Effect of series resistance R series and shunt resistance R shunt

The resistance in series and shunt (R series and R shunt ) affects the J–V curve’s form and slope, which in turn affects the solar cell’s efficiency. The connections electrodes, electrical dissipation in the perovskite, and layers of hole and electron transport materials (HTM and ETM) are primarily linked to the cause of the R series . However, different recombination pathways, device design, and defects induced during the layer deposition process are linked to the cause of the R shunt . According to the literature, a high shunt resistance and a low series resistance are necessary for a solar cell to have a high efficiency. Electrons cannot flow freely across a circuit if the series resistance is large, and leakage current will occur if the shunt resistance is low, producing PSCs with low stability and efficiency. When there’s a low shunt resistance or a high series resistance, the PSC’s maximum output and FF would both drop 71 , 72 . The ideal diode model’s Eq. ( 4 ) was applied in order to comprehend the impact of R series and R shunt on the perovskite solar cell’s performance 73 .

When \(J\approx\) 0 mA/cm 2 for open circuit state, the variables V OC and R shunt relationship is presented in Eq. ( 5 )

where J is the current flowing via the external circuit, V is the output voltage, A is the ideality factor, k is the Boltzmann constant, T is the temperature, q is the electron charge, J O is the saturation current density and J L is the light-induced current density. As a result, low R shunt reduces photovoltaic voltage and may also have an impact on the photocurrent that is collected, whereas high R series values primarily influence the FF and Jsc values 72 .

While keeping the other simulation parameters same, R series and R shunt were changed from 0 to 100 Ωcm 2 and 10 3  Ωcm 2 to 10 10 Ωcm 2 respectively, to better understand their influence on the J–V curves. The responses of V OC , J SC FF and PCE as a function of R series are presented in Fig.  9 . V OC stays fairly constant, J SC falls from 33.51 to 10.77 mA/cm 2 , and FF drops from 85.63 to 24.88% while R series grows from 0 to 100 Ωcm 2 . As a result, as Fig.  9 d illustrates, PCE’s behavior is precisely proportional to J SC and FF, decreasing from 31.16 to 2.91% for the same range. Alternatively, as Fig.  10 illustrates, when R shunt rises from 10 3 to 10 10 Ωcm 2 , V OC rises from 1.0858 to 1.0868 V, J SC maintains a constant 33.49 mA/cm 2 from 10 4 Ωcm 2 , FF rises from 80.75 to 83.12%, and the PCE rises from 29.34 to 30.26% respectively (Fig.  10 a–d). For R series and R shunt , the optimal values are therefore 1 Ωcm 2 and 10 6 Ωcm 2 respectively, which is in conformity with literature.

Effect of series resistance variation on the optimized IPSC based device parameters. ( a ) Plot of V OC against series resistance. ( b ) Plot of J SC against series resistance. ( c ) Plot of FF against series resistance, ( d ) Plot of PCE against series resistance.

Effect of shunt resistance variation on parameters of the optimized IPSC device. ( a ) Plot of V OC against shunt resistance, ( b ) Plot of J SC against shunt resistance, ( c ) Plot of FF against shunt resistance, ( d ) Plot of PCE against shunt resistance.

Effect of the defect state of bulk and interface layers

The impact of the absorber’s defect density is an important factor that needs to be examined. In the absorber layer, defects are inevitable. Both at surfaces and in the bulk, they are present. Point defects in the perovskite absorber layer include lattice vacancies, interstitial, Schottky, and Frenkel defects. In addition, there may be higher order defects like grain boundaries and dislocations 74 . The self-doping process in the absorber layer creates the p-type semiconductor that results in an impurity defect 54 , 56 , 75 , 76 . These defects cause the energy bandgap to appear at shallow or deep levels 74 . Charge carriers have the ability to capture and promote nonradiative recombination of electron–hole as a result of these defects 53 , 55 . Noteworthy, the simulated interface defect density for both electron and hole recombination velocities was 1 × 10 -2  cm/s for both HTM/MASnI 3 and ETM/MASnI 3 interface. In the Sn-based perovskite absorber layer, the electron and hole diffusion lengths were 16 µm and 6.2 µm, respectively. The optimized device’s absorber defect density (Nt) of 2 × 10 15  cm −3 achieved a V OC of 1.0867 V, a J SC of 33.4942 mA/cm 2 , FF of 82.88%, and a PCE of 30.17%. Nevertheless, synthesizing a material with a low defect density value is a challenging task in an experiment 55 .

The Shockley–Read–Hall (SRH) recombination model has been applied to provide understanding regarding the impact of defect density in the absorber layer on device performance 49 , 53 , 77 . The effect of defect density on the recombination rate based on the SRH recombination model is essential to determining the critical influence of Nt on the device performance. The plot of recombination rate with depth from the optimized device’s surface is depicted in Fig.  11 .

Recombination rate of the optimized device with depth from the surface.

The proposed device produced quantum efficiency curve covering the entire visible spectrum (300–900 nm) achieving an optimum quantum efficiency (QE) of 99.38% at 580 nm wavelength, which is in agreement with other works 15 , 43 , 54 , 61 , 78 , 79 is presented as Fig.  12 . The simulated inverted structure, energy band diagram, energy band alignment and complete device structure of the optimized inverted planar perovskite solar cells are presented as Figs. 13 , 14 , 15 and 16 , respectively. It’s very clear that the photovoltaic performance of the proposed device as shown in Table 3 is superior to other related works reported in the literature.

Quantum efficiency of the proposed inverted perovskite solar cell.

The simulated inverted device structure.

Energy band diagram of the proposed inverted perovskite solar cell.

Energy band alignment profile of the proposed inverted perovskite solar cell.

The complete optimized structure of the proposed n-type TCO-free inverted perovskite solar cell.

The toxic-free CH 3 NH 3 SnI 3 as light harvesting material is explored in this study. A heterojunction planar perovskite solar cell with an inverted structure Glass/Cu 2 O/CH 3 NH 3 SnI 3 /ZnO/Al was simulated, optimized and analyzed in this paper. In relation to various photovoltaic parameters such as the work function of the back contact electrodes, thickness of the HTM layer, absorber and the ETM layers, and the absorber’s doping concentration were optimized. The thickness of the HTM, absorber layer and ETM were optimized to 40 nm, 1200 nm and 200 nm respectively. The optimized structure produced an enhanced Voc of 1.0867 V, J SC of 33.4942 mA/cm 2 , FF of 82.88% and PCE of 30.17% respectively. The results indicate that an increase in doping concentration of the absorber increased the Voc, FF and PCE but decreased the J SC of the solar cell. The interface between the ETM/back-electrode requires a cheap and low work function metal for enhanced performance. The n-type TCO-free inverted CH 3 NH 3 SnI 3 -based PSC provides a potential path to attaining simple, eco-friendly, cheap and highly efficient perovskite solar cell device using all-inorganic transport materials.

Data availability

The data that support the findings can be made available upon reasonable request from the corresponding author on [email protected].

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The authors are very grateful to Dr. Marc Burgelman of the University of Gent in Belgium for providing the SCAPS-1D simulation program.

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Nyiekaa, E.A., Aika, T.A., Danladi, E. et al. Simulation and optimization of 30.17% high performance N-type TCO-free inverted perovskite solar cell using inorganic transport materials. Sci Rep 14 , 12024 (2024). https://doi.org/10.1038/s41598-024-62882-7

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