Chapter 199: I'll help you remove other obstacles

"I have a scientific research support system ( to find the latest chapter!
Back at school, the school girl returned from a clinging state to normal.
However, Xu Qiu obviously felt that their relationship had become much closer.
The two went to the cafeteria to settle dinner first, and then returned to the laboratory.
It was close to eight o'clock in the evening, and the rest of the team were there, but Chen Wanqing was the only one at the desk.
"We are back." Senior Sister Xu Qiuchao greeted.
"How is the test?" Chen Wanqing asked, raising her head. She noticed the evolution of the literature in the field of organic photovoltaics. She may also need to use theoretical tests like TRPL in the future.
"The data has been obtained, and it feels good, but it hasn't been analyzed yet," Xu Qiu added: "Hou Kaihua is responsible for the testing and data processing. We just went to make soy sauce."
"Okay," Chen Wanqing nodded, and handed over a U disk: "You asked me to measure the DFT data before. I have already measured it for you."
"Thank you, senior sister." Xu Qiu took the USB flash drive and put it on the desk. Then he opened the school bag and took out two dolls. The school girl couldn't fit the school bag before, so he put it in his bag.
On the way back from the two, the school girl said,
I caught too many dolls this time, she can’t use so many by herself, and when she goes out, she has to bring back something for others. It’s better to divide these six dolls. For the small partners in the research group, there are exactly six people, and one can be one for each." Xu Qiu naturally had no opinion 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, the plush is so cute." Chen Wanqing grabbed the yellow leather god, "Can I want this?"
"Of course." Han Jiaying smiled. What she left for herself was the blue jingle cat that she caught for the first time. This is also the first crystallization of her and her brother, which is very memorable.
The movement on the desk was naturally transmitted to the laboratory.
Wu Feifei was experimenting in the glove box, but her eyes couldn't help but glance this way. Tian Qing even took off her lab coat and hurried to the sink for washing her hands.
Duan Yun raised his head and glanced, hummed an unknowing word, and then lowered his head to continue the experiment.
Tian Qing ran over and chose Big Bear Pooh among the remaining four dolls. She curiously asked, "Are you going to do an experiment or to catch a doll?"
"When I was eating at noon, I passed by a video game city and just played for a while." Xu Qiu didn't elaborate. It's good to know things like public travel.
"That's it." Tian Qing didn't ask much. After playing with the bear doll for a while, she seemed to remember that she was running over in the middle of the experiment, so she put the bear on her seat and returned to the laboratory.
It didn't take long for Xu Qiu to hear the direction of the laboratory, and Feifei Wu's voice came: "Leave me with the SpongeBob SquarePants."
‘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 change the article.
Most of the relatively easy-to-correct points and easy-to-answer questions were completed yesterday after the experiment, and the rest are two difficult bones-dark state J-V curve and TRPL data analysis.
The description of these two parts is written for the first time, and I still need to think about it slowly. You need to refer to the papers published by many 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 can't be improved quickly by looking at the system images. Just like the original literature reading, it is slowly raised over time.
On the other hand, the journal to which the article is submitted is AEM, which is of high grade, which means that the probability of being seen by peers is also high.
Once an academic paper is officially published, there is usually no chance of revision. If any low-level mistake is made, it 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 they are falsified, people who are willing to check it, even in the past ten or twenty years, can be found.
The task of searching for related papers is naturally handed over to the school girl. It is not difficult to operate. It is just to open the PDF one by one, check whether there is a dark state JV curve and TRPL curve, and copy the file to a file if there are. Hold it for use.
The literature is slightly more, there are 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 are not a small workload.
...
In the next few days, Xu Qiu's job was to check relevant literature, sort out the experimental data used in the article from a bunch of data, and write two supplementary descriptions of the experiment. Han Jiaying assisted.
For TRPL data, the original data is a scatter plot, which can be analyzed only after fitting. Generally, exponential fitting is used, which is divided into single exponential fitting, double exponential fitting, and multiple exponential fitting.
Fitting with several exponents assumes that after the organic photovoltaic material is excited, there are a total of several charge dynamics from the generation to the disappearance of the fluorescence.
Sun Wenyan has completed this part of the work. He is more responsible. The data of each sample is fitted with single index, double index and triple index respectively, and the results are summarized to Xu Qiu.
He made a round and unified the data with double exponential fitting.
The main criterion is the CHISQ independence test result. This data is usually greater than 1, and the closer to 1, the higher the reliability of the fitting result.
The 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 are distributed between 1.0-1.6.
Among 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 to the double-exponential fitting.
For theoretical research, in most cases, you can simplify it.
Moreover, this result is also in line with the convention 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 excitons are generated. The so-called recombination is the process of the encounter and cancellation of positive and negative charges.
In the field of organic photovoltaics, there are mainly two processes of single-molecule recombination and bi-molecular recombination. The former represents that the positive and negative charges involved in the recombination come from the same molecule, and the latter comes from two different molecules.
After determining the data using double exponential fitting, Xu Qiu listed the experimental data of each sample, including five main parameters, two time constants, or fluorescence lifetime, and their share in the entire charge dynamics process. The percentage of examples, and the average fluorescence lifetime.
Then, he began to draw on the data analysis in other documents and write his own description.
This time, it is true that most of the elements are borrowed from the opinions of others, after all, the theoretical aspect is his shortcoming.
In this part, he plans to pick a few citations from industry leaders.
Although this will disrupt the citation order of references and increase the workload of modifying the article, it is worthwhile as long as the article can be published smoothly.
Of course, only the views of others are used for reference, and those views must be integrated into their own system to draw their own conclusions.
In the process of writing, Xu Qiu held several small meetings with senior sisters and senior sisters to discuss.
It was a discussion, but in fact, he was mainly talking and the other two were listening. The content was his knowledge of the mechanism summarized during this period.
In the end, after a difficult data analysis process, Xu Qiu got two main conclusions:
First, comparing the P4T molecules under different side chains, the ratio of the fluorescence lifetime of the PCE11 single component and the blend system is the highest, indicating the highest charge resolution efficiency, which can be attributed to its excellent blend film morphology.
Second, comparing the absolute values ​​of the fluorescence lifetime of the individual component films under the four systems, the PCE11 system has the longest, indicating the lowest degree of charge recombination.
After this change, Xu Qiu felt that the grade of his article had increased a bit.
Sure enough, friendly academic exchanges in scientific research circles are still very important.
At the same time, he has once again realized his shortcomings, and his theoretical knowledge still needs to be strengthened. Compared with those industry leaders who have been in the organic photovoltaic industry for more than ten years, there is still a big gap.
In the future, both theory and practice must be grasped, and both must be firm!
...
On Thursday morning, Teacher Wei came to 216 to find Xu Qiu and asked: "How is the article changed?"
"I'm still making up the description part, because it involves theoretical analysis, and it takes a lot of time to consult a lot of literature. Now that the TRPL part is basically completed, it should be all done before this Sunday." Xu Qiu replied.
"It's okay, don't worry." Wei Xingsi smiled and said casually:
"In the article that Tian Qing submitted last time, one of the reviewers specializes in CELIV research, Ronald. Their group has studied this method for more than ten years, and they have developed several improved CELIV test methods. Interested in working with us to promote these methods to us."
Xu Qiu nodded, knowing that SCLC is the mainstream in the field of organic photovoltaics and perovskites, and there are not many CELIV tests. Researchers like Ronald who specialize in an experimental technology prefer 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 cleverly said, "Ms. Wei, I think we also need to further expand the testing channels, including the transient fluorescence spectrum TRPL measured a few days ago, and the transient optical absorption spectrum TAS theoretical analysis methods." After a pause, he continued:
"I think that in order to do a very good job in the future, theoretical support is essential."
"Well," Wei Xingsi pondered for a moment, and said, "Buy a TRPL instrument, it's estimated to be around 200,000 yuan, do you think we need to buy it?"
"I think it is necessary." Xu Qiu replied earnestly. ‘It seems that Teacher Wei has already had some thoughts in his heart, otherwise it is impossible to directly propose to buy the equipment, and he also has a rough quotation. ’
"Okay, I'll think about it again. TAS is fine. That's too expensive. I think about ways to find opportunities for cooperation. I guess I have to go abroad." Before leaving, Wei Xingsi added:
"Anyway, when you are doing the experiment, if you encounter any problems, please mention it to me in time, so you can do the experiment with peace of mind and realize your ideas. I will help you remove other obstacles."
...
Next, Xu Qiu continued to work.
He logarithmizes the dark state J-V data corresponding to the best devices of the four major systems:
First, zero the data at the zero point of the horizontal axis, and 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 the other data outside the origin.
The obtained curve looks like a curved V-shaped curve as a whole. The part on the left side of the horizontal axis is usually examined. It is divided into three stages. The shape of the curve is dominated by leakage current, composite current, and series resistance.
Then came the data analysis. Originally, Xu Qiu had planned for a protracted battle, but after reading the relevant literature, he found that the difficulty was not high, at least it was much simpler than TRPL analysis.
Just draw the picture, put the picture in the text, describe it truthfully, and add the sentence "Dark state JV curve is normal" at the end~EbookFREE.me~ The cited literature is still to be cited, anyway, write it before At the time of TRPL, the order of the documents was already out of order, so I don't mind inserting a few more articles.
Journals generally don't limit the number of citations of articles, but there are hidden rules.
For example, in the field of organic photovoltaics, an average article cited about 50, most of the citations are in the introduction section, which will account for 30-40 articles, and the remaining part is scattered in the various characterization methods of the main text, quoting the opinions of others. It is necessary to mark the source.
Of course, there are 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 dark state J-V curve part, Xu Qiu also understood one of the important functions of the dark state J-V
Used to help prove the reliability of the bright J-V data.
If the performance of the device is very good, such as PCE11 with a photoelectric conversion efficiency of more than 11%, its dark state J-V curve must be normal.
If the curve shape 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 the revised draft to Teacher Wei, and the two changed 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 was also the longest and most difficult time for Xu Qiugai's article revision.
‘I hope the article can be received smoothly. Xu Qiu thought for a while. After coming back from winter vacation, he encountered a lot of things. The experimental rhythm planned before was completely disrupted.
‘I hope I won’t encounter any moths next week. ’