I Have a Research Support System

Back at school, the school girl returned to a normal state from a clingy state.

However, Xu Qiu obviously felt that their relationship was much closer.

The two went to the cafeteria to finish their dinner first, and then returned to the laboratory.

At this time, it was close to eight o'clock in the evening, and everyone else in the research team was there, but there was only Chen Wanqing at the desk.

We're back. Xu Qiuchao greeted senior sister.

How's the test going? Chen Wanqing raised her head and asked, she noticed the evolution of the literature content in the field of organic photovoltaics, and she may also use it in the future for more theoretical tests like TRPL.

The data has been obtained, and it feels good, but it has not been analyzed yet, Xu Qiu added: Hou Kaihua is responsible for the testing and data processing, and we just went to make soy sauce.

Okay, Chen Wanqing nodded, and handed over a USB flash drive: The DFT data you asked me to measure before, I have already measured it for you.

Thank you, senior. Xu Qiu took the USB flash drive and put it on the desk. Then he opened his schoolbag and took out two dolls. The previous junior's schoolbag couldn't fit, so he put them in his bag.

On the way back, the school girl said, This time I caught too many dolls. She can't use so many by herself. Besides, she has to bring something back for others when she goes out. Why don't these six dolls be distributed? For the small partners in the research group, there are exactly six people, one for each. Xu Qiu naturally had no objection and nodded in agreement.

So, Han Jiaying took out the other four from her bag, and said, This is a gift we brought back from Sucheng.

Wow, it's so fluffy and cute. Chen Wanqing grabbed the yellow skin, Can I have this?

Of course. Han Jiaying smiled. What she left for herself was the blue Jingle cat she caught for the first time. This is also the first crystallization of her and her senior brother, which is very commemorative.

The movement at the desk naturally spread to the laboratory.

Wu Feifei was doing experiments in the glove box, but she couldn't help but cast her eyes here. Tian Qing even took off her lab coat and hurried to the sink for washing her hands.

Duan Yun raised his head and took a look, hummed a few words, then lowered his head and continued with the experiment.

Tian Qing ran over and chose Winnie the Pooh among the remaining four dolls. She asked curiously, Are you going to do an experiment or grab a doll?

When I was having lunch, I passed by a video game store, so I played for a while. Xu Qiu didn't elaborate, it's good to know such things as traveling at public expense.

Is that so. Tian Qing didn't ask much. After playing with the bear doll for a while, she seemed to remember that she ran over in the middle of the experiment, so she put the bear on her seat and returned to the laboratory.

Not long after, Xu Qiu heard Wu Feifei's voice from the direction of the laboratory: Keep the one of SpongeBob SquarePants for me.

‘In this case, there are two left, one is the big gray wolf, and the other is the pink Jenny turtle. '

Xu Qiu stared at the remaining two dolls, and decisively left the long-lived species to Duan Yun.

After playing around for a while, he took Han Jiaying to work and continued to revise the article.

Most of the relatively easy-to-change and easy-to-answer questions were completed yesterday outside the experiment, and the rest are two difficult bones-the data analysis of the dark J-V curve and TRPL.

This is the first time I have written the description of these two parts, and I still need to think about it slowly, and I need to refer to many papers published by other researchers.

On the one hand, although Xu Qiu copied Sun Wenyan's fifth-level proficiency, it is not his own ability after all, and the specific mechanisms of perovskite and organic photovoltaic materials are likely to be different.

In addition, this kind of theoretical analysis is different from experimental operations. It cannot be improved quickly by looking at the system image. Just like reading the literature at the beginning, it is slowly improved over time.

On the other hand, the journal for which the article is submitted is AEM, which has a high grade, which also means that the chance of being seen by peers is also high.

Once an academic paper is officially published, there is usually no opportunity to revise it. If you make any low-level mistakes, you will be laughed at by thousands of academic colleagues.

This is also the reason why the risk of falsification of papers is very high. The articles are placed there. If it is falsified, someone with a heart can check it out. Even in the past ten or twenty years, it can be found out.

The task of searching for relevant papers is naturally handed over to the school girl. It is not difficult to operate, just open the PDF one by one, check whether there are dark J-V curves and TRPL curves, and if so, copy the files to a file Hold in the folder for use.

That is, there are a little more literature, with hundreds of articles.

Xu Qiu is responsible for drawing pictures of the processed experimental data, and conducting preliminary analysis and sorting.

27 sets of data is not a small workload.

...

In the next few days, Xu Qiu's job was to look through the relevant literature, sort out the experimental data used in the article from a pile of data, and write the descriptions of the two supplementary experiments, assisted by Han Jiaying.

For TRPL data, the original data is a scatter diagram, which needs to be fitted before analysis. Generally, exponential fitting is used, which is divided into single exponential fitting, double exponential fitting, and multi-exponential fitting.

Using several exponential fittings is to assume that after the organic photovoltaic material is excited, there are several charge dynamic processes in the process of fluorescence generation to disappearance.

Sun Wenyan has already completed this part of the work. He is more responsible. The data of each sample is fitted with single, double and triple exponentials, and the results are summarized to Xu Qiu.

He made some trade-offs and uniformly adopted the data of double exponential fitting.

The main basis for judgment is the result of the CHISQ independence test, which is usually greater than 1, and the closer to 1, the higher the reliability of the fitting result.

As a result of single exponential fitting, CHISQ is distributed between 1.5-2.5, and the reliability of fitting data is poor.

The CHISQ values ​​of double-exponential fitting and triple-exponential fitting were distributed between 1.0-1.6.

Among them, in the three-exponential fitting, the proportion of the corresponding process under the third index is very small, only a few percentage points, which can be ignored, thus simplifying it to double-exponential fitting.

For theoretical research, in most cases, it can be simplified as much as possible.

Moreover, such results are also in line with the practice in the field of organic photovoltaics.

Through the literature research during this period, Xu Qiu learned that the charge dynamics process in the TRPL test corresponds to the charge recombination process after the excitons are generated. The so-called recombination is the process in which positive and negative charges meet and cancel each other out.

In the field of organic photovoltaics, there are mainly two processes: unimolecular recombination and bimolecular recombination. The former means that the positive and negative charges participating in the recombination come from the same molecule, while the latter comes from two different molecules.

After confirming the data using double exponential fitting, Xu Qiu tabulated the experimental data of each sample, including five main parameters, two time constants, or fluorescence lifetimes, and their contribution to the entire charge dynamics process. The percentage of , and the average fluorescence lifetime.

He then began to write his own descriptive section, drawing on data analysis from other literature.

This time, it is true that most of the elements are borrowed from other people's views. After all, the theoretical aspect is his shortcoming.

In this part, he intends to select a few literature citations of industry leaders.

Although this will disrupt the citation order of the references and increase the workload of revising the article, it is worthwhile as long as the article can be published smoothly.

Of course, what is used for reference is only other people's viewpoints, and those viewpoints must be integrated into one's own system to draw one's own conclusions.

In the process of writing, Xu Qiu held several small meetings with senior sisters and junior girls to discuss.

It was a discussion, but in fact it was mainly him who was talking, and the other two were listening, and the content was the knowledge of mechanisms he had summed up during this period.

In the end, after a difficult process of data analysis, Xu Qiu came to two main conclusions:

First, comparing the P4T molecules under different side chains, the fluorescence lifetime ratio of PCE11 alone and the blend system is the highest, indicating that it has the highest charge splitting efficiency, which can be attributed to its excellent blend film morphology.

Second, comparing the absolute values ​​of the fluorescence lifetimes of individual component films under the four systems, the PCE11 system is the longest, indicating that its charge recombination degree is the lowest.

After revising in this way, Xu Qiu felt that the grade of his article had increased a bit.

Sure enough, friendly academic exchanges in the scientific research circle are still very important.

At the same time, he also realized his own shortcomings again. The knowledge of these theories still needs to be strengthened. Compared with those industry leaders who have been immersed in the field of organic photovoltaics for more than ten years, there is still a big gap between him and him.

In the future, both theory and practice must be grasped and hardened!

...

On Thursday morning, Teacher Wei came to 216 to ask Xu Qiu, How is the article changed?

I'm still working on the description part. Because it involves theoretical analysis, I need to consult a lot of literature, which is time-consuming. Now the TRPL part is basically completed, and it should be all done before this Sunday. Xu Qiu replied.

It's okay, there's no rush. ​​Wei Xingsi smiled, and casually mentioned:

In the article Tian Qing submitted last time, one of the reviewers was dedicated to CELIV research, Ronald, and their group has been studying this method for more than ten years, and has developed several improved CELIV test methods. interested in cooperating with us and promoting these methods to us.

Xu Qiu nodded, knowing clearly that the domestic mainstream in the field of organic photovoltaics and perovskites is to use SCLC, and there are not many people who can test CELIV. A researcher like Ronald who specializes in an experimental technology prefers to expand his experimental methods. In various fields, this may be the reason why the other party took the initiative to come to the door.

Thinking of this, Xu Qiu had an idea and said, Teacher Wei, I think we also need to further broaden the testing channels, including the theoretical analysis methods of transient fluorescence spectrum TRPL and transient optical absorption spectrum TAS measured a few days ago. After a pause, he continued:

I think that if you want to do very good work in the future, theoretical support is essential.

Well, Wei Xingsi pondered for a moment, and said, To buy a TRPL instrument, it is estimated to be around 200,000. Do you think it is necessary for us to buy it?

I think it is necessary. Xu Qiu replied seriously. 'It seems that Mr. Wei has already had some ideas in his heart, otherwise it would be impossible to directly propose to buy the instrument, and he also has a rough quotation. '

Okay, I'll think about it again. TAS is fine. That's too expensive. I'll find a way to find out if there is any opportunity for cooperation. I think we need to go abroad. Before leaving, Wei Xingsi added:

Anyway, if you encounter any difficulties during the experiment, please let me know in time. You can do the experiment with peace of mind and realize your own ideas. I will help you remove other obstacles.

...

Next, Xu Qiu continued to work.

He logarithmized the dark state J-V data corresponding to the optimal devices of the four major systems:

First zero the data at the zero point of the horizontal axis, then take the absolute value of the data on the left side of the horizontal axis of the coordinate axis, because the current density here is a negative number, and finally take the logarithm of other data outside the origin.

The obtained curve looks like a curved V-shaped curve as a whole. Usually, the part on the left side of the horizontal axis is considered, and it is mainly divided into three stages. The shape of the curve is dominated by leakage current, recombination current, and series resistance.

Then came the data analysis. Originally, Xu Qiu had already planned for a protracted war, but after reading the relevant literature, he found that the difficulty was not high, at least it was much easier to analyze than TRPL.

You only need to draw the picture, put the picture in the text, describe it truthfully, and add a sentence the dark J-V curve is normal at the end.

The cited documents still need to be cited. Anyway, when I wrote TRPL before, the order of the documents has been messed up. I don’t mind inserting a few more articles.

Journals generally do not limit the number of references cited in articles, but there are also unspoken rules.

For example, an average article in the field of organic photovoltaics cites about 50 articles. Most of the citations are in the introduction part, which will account for 30-40 articles. It is necessary to mark the source.

Of course, there will be differences in different fields. For example, Duan Yun’s thermoelectric field has about 25 articles, and Wu Feifei’s perovskite field has about 30 articles.

After completing the part of the dark J-V curve, Xu Qiu also understood the important role of the dark J-V——

It is used to assist in proving the reliability of bright state J-V data.

If the performance of the device is very good, and the photoelectric conversion efficiency exceeds 11% like PCE11, its corresponding dark-state J-V curve must be normal.

If the shape of the curve is not very normal, then others will naturally doubt the authenticity of the bright J-V curve data.

The higher the grade of the journal, the stricter the review, the higher the completeness of the data, and the higher the difficulty of fraud.

...

On Sunday, Xu Qiu handed over the revised draft to Mr. Wei, and the two revised several versions together before sending the final version back to the editor.

After a week, the major revision of AEM articles finally came to an end. This is also the longest and most difficult time for Xu Qiu to revise his articles.

'I hope the article can be received smoothly. ’ Xu Qiu thought about it, came back from the winter vacation, encountered many things, and the previously planned experiment rhythm was completely disrupted.

'I hope I don't encounter any moths next week. '

Thank you for rewarding 100 starting coins for not reading novels for a day.