I Have a Research Support System

After the applause lasted for a few seconds, Teacher Wei raised his hand, looked at the crowd, and continued:

Wu Shengnan's main research field before was 'triphenylamine-based conjugated polymer photoluminescence materials', after joining our research group, she will simultaneously carry out the synthesis of perovskite quantum dot light-emitting materials and organic conjugated polymers Research on photoluminescent color-changing materials.

Afterwards, Wei Xingsi pointed to Wu Feifei and Xu Qiu, and introduced to Wu Shengnan in turn: This is Wu Feifei, who is mainly in charge of the perovskite field in the group, and this is Xu Qiu, who is mainly in the organic field. After that, what are the problems in the laboratory? You can communicate with them.

Wu Shengnan realized something. Since Teacher Wei specially introduced these two people, it means that they are the mainstays in the group. Therefore, she nodded to Wu Feifei and Xu Qiu respectively, and after carefully observing the appearance of the two, Wu Shengnan was slightly surprised in his heart, the two of them looked so young, but she didn't show it.

Wei Xingsi went to the coffee table and poured a cup of tea, took it back to the desk and sat down, and said to everyone: Let's start the meeting.

Wu Feifei first reported: Last week, I tried n-BA and iso-BA two-dimensional perovskite materials to prepare devices. The n-BA system completely repeated the conditions in the literature. The device efficiency was 8.3%, which was 12.4% higher than that in the literature. % is slightly lower, and the iso-BA system has a maximum efficiency of 4.6%. In addition, it can be seen from the J-V curve that the hysteresis phenomenon in our two-dimensional perovskite systems is not obvious.

The so-called hysteresis phenomenon refers to that during the test process of the J-V characteristic curve of the perovskite solar cell device, when the forward scan is performed alternately continuously, that is, the applied bias voltage changes linearly from negative to positive, and the reverse scan, that is, the applied bias voltage When linearly changing from a positive value to a negative value, the shape of the two curves is inconsistent, which is mainly caused by non-radiative recombination and ion migration in the perovskite active layer film, which will affect the reliability of device performance evaluation and reduce the test performance. device speed.

This phenomenon is not obvious in the field of organic photovoltaics, so Xu Qiu and the others don't usually have to worry about this problem.

Not bad. Wei Xingsi simply praised, although Wu Feifei has not completely repeated the results in the literature, but the efficiency is 8.3%, indicating that the battery device can work normally, and the rest can be slowly optimized.

Wei Xingsi looked at the performance data on the projection screen for a while, and asked, What are your plans for the next experiment?

Optimize the preparation of the effective layer solution, Wu Feifei turned the PPT forward one page, and then pointed the laser pointer spot at the effective layer solution formula, saying: The traditional three-dimensional MAPbI3 'one-step' solution preparation method is to combine Lead iodide (PbI2) and MAI are directly mixed in proportion, and then dissolved in DMF solvent, there is no room for manipulation.”

However, in the solution of two-dimensional perovskite, volatile hydroiodic acid is used, and part of it will be lost during the preparation process, so it is necessary to find out the appropriate amount of hydroiodic acid added.

On the other hand, amine reagents such as n-butylamine or isobutylamine are newly added to form an organic spacer layer. If the amount of amine reagents added is relatively large, the average The n value of the number of layers will decrease, on the contrary, if the amount of amine reagent added is relatively small, the n value will increase, and this aspect should also be regulated to find the n value range with the best photoelectric performance.

Well, generally I agree with your thinking, Wei Xingsi nodded, and then changed the topic: However, in addition to the optimization of the effective layer solution, the device structure can also refer to the Nature, I remember they used FTO /C-60 substrate, we can also try it, C-60 can be evaporated, and FTO (fluorine-doped tin dioxide conductive glass) can be etched manually.

Wei Xingsi paused, and said to Xu Qiu: Do you still remember the experimental process of etching the flexible ITO substrate?

Remember. Xu Qiu responded, but complained in his heart, Hey, as you master more and more skills, it becomes easier to be called at group meetings. You must concentrate and not wander off. Before The content of perovskite can be listened to less seriously, but not now. '

After complaining, Xu Qiu sat on the bench and recounted while recalling:

The etchant is 2M dilute hydrochloric acid and zinc powder. What I did at the time was to stick the ITO pattern with 3M adhesive tape, then throw it into a disposable PE cup filled with hydrochloric acid and zinc powder, etch for about 30 seconds, and finally The effect is not bad. If it is replaced with an FTO substrate, the conditions may change, and the method of wax sealing can be used instead of 3M adhesive tape, and the obtained pattern area will be more accurate.

Okay, Wei Xingsi nodded, Wu Feifei, please refer to it.

Okay, I'll record everything. When Xu Qiu was talking just now, Wu Feifei was writing down the notes.

Duan Yun, come on. Wei Xingsi said.

After Duan Yun submitted his last Small article, the experimental work has once again come to a standstill, saying: I tried nickel nanowires last week, but the result was not good. I will try again this week.

'If it's not good, it's not good. Why do you say it so confidently. ’ Wei Xingsi was angry and laughed, but considering that Duan Yun had just submitted an article last week, he did not attack: I see, Tian Qing, come here, how is the review proposal of Chem. Soc. Rev.?

Tian Qing: Last Tuesday and Thursday, Feng Shengdong and I discussed twice, and decided on the division of labor for the literature review plan. Now more than half of it has been written, and it can be completed before the May Day holiday.

Hearing the good news, Wei Xingsi's expression softened a lot, and he called the name again: Sun Wo!

Sun Wo shook his body, stood up and said, Last week I was mainly writing my graduation project, and by the way, I helped Senior Sister Wu Feifei prepare devices.

Wei Xingsi gave a noncommittal Oh and continued to roll the roll: Chen Wanqing, how is your AM writing going?

Chen Wanqing: I'm still writing, and it should be finished before the May Day holiday.

Okay, after finishing writing, let Xu Qiu read it to check. Wei Xingsi nodded, turned his eyes to Xu Qiu, and said:

Xu Qiu, the NC you submitted last week, Nature Communications, I checked the background today, it has passed the editor's review, and sent it to the reviewers for review. How is the EES writing now?

The rough draft has been written, and the repeatability data of the device is still missing. Xu Qiu replied.

Considering that the highest efficiency has been optimized to 9.15%, it is definitely impossible to break 10% in a short period of time. There is no need to procrastinate. Besides, this week, the senior sister will submit an article, and Tian Qing will also submit a review proposal. It is better to help Teacher Wei relieve the pressure , send the article out earlier, thinking of this, Xu Qiu added: Submit on Wednesday.

However, Xu Qiu was a little puzzled, what happened to Mr. Wei today, NC is just NC, and he even read his full name on purpose, including Tian Qing's review before, Chen Wanqing's AM work, and the EES he wrote now. Name the journal.

It wasn't until he saw Wu Shengnan next to him that he realized that Mr. Wei was showing off to the new members.

Xu Qiu instantly made up the picture, a strange sorghum holding a lollipop, and said to a little loli, Look at the others, as long as you work hard, the article will not be a problem.

At this time, Wu Shengnan's mouth became O, and he thought: Is everyone in this group so NB?

Her undergraduate degree is an ordinary one, with a master's degree of 211 and a doctor's degree of 985. The best article published before is an AFM, but it is still a review with average gold content. There is also a JMCA, an ACSAMI, and the rest Both are three district articles.

AFM is a sub-journal of AM, which is slightly worse than AEM, but it is also a relatively good regional journal.

In fact, with her achievements, she has already surpassed more than half of the doctoral candidates. There is no way, most of the graduate students are actually in the state of salted fish.

She did not choose to go abroad to find a post-doc. On the one hand, her English level is average, and on the other hand, it is difficult for post-docs from foreign big teams to apply. Many post-docs require them to bring their own projects. The money is only collected when it comes, unless you are a very good type of person who can post articles above AM and above casually, then naturally you are rushing to ask for it.

Relatively speaking, it is easier to study abroad for a doctorate degree. The disadvantage is that you cannot apply for a scholarship, you need to pay for it yourself, it is more difficult to graduate, and the per capita graduation is delayed.

In addition, her field is still not very popular such as photochromism, so it is even more difficult to find foreign postdoctoral fellows.

Therefore, she finally decided to stay in China for development in Shanghai, so she searched for tutors in the Department of Materials and Chemistry of several 985 universities such as Shanghai Jiaotong University, Shanghai University of Science and Technology, Tongji University, etc., and finally screened out Wei Xingsi waited for a few teachers, after getting in touch, they confirmed Teacher Wei.

The main reason for choosing Mr. Wei is because Wu Shengnan saw his real-time updated results. Not long after returning to China, the students published more than 20 articles in high-quality journals such as AM, EES, AEM, and ACSEL. Articles, and the worst articles among them are the second district, with unlimited potential.

Now she participated in the first group meeting, and heard that everyone in the group was making big news, it was Chem. Soc. Rev., it was NC, it was EES, and it was AM. The whole person was shocked .

Finally, Jiaying Han reported the experimental data of last week, mainly the characterization data of the EES article.

After the group meeting, Wei Xingsi ordered Wu Feifei to order lunch, and then left Wu Shengnan alone.

How about it, the team will listen to it. Wei Xingsi said casually.

Your students are all very good. Wu Shengnan praised sincerely. After listening to a group meeting, she roughly understood the distribution of members in the group. Three are organic, two are perovskite, and one is One for mechanism and one for thermoelectricity. Their own direction intersects with organic and perovskite, but they are relatively independent.

Wei Xingsi followed her words and said, Yes, and several potential stocks are very young. Wu Feifei is a master's and doctoral student. She just transferred to her doctoral degree this year, so she is in her first year of PhD.

What about Xu Qiu? Wu Shengnan asked curiously.

He is a senior undergraduate student in our school. He just graduated in September this year, and then he started blogging directly in the group. When Xu Qiu was mentioned, Wei Xingsi couldn't help but feel a lot better, and his face was full of smiles.

You're only a senior?! Wu Shengnan said in surprise, Is the senior year about to issue NC and EES?

Wei Xingsi explained with a smile: The NC article was written by Xu Qiuyi, and the other EES article was written by him and the third-year girl who reported last, Han Jiaying. Because Xu Qiu's article is well written, he will write it. In addition to these two articles, Xu Qiu also published an AM article and an AEM article before, as well as two District 2 articles and a just-published ACSEL review.

Are the current undergraduates so strong? Wu Shengnan said with emotion. She had browsed the academic achievements on the official website of Mr. Wei's research group before, but she didn't check the corresponding authors of the articles. Now it seems that her homework is still not enough Ah, I didn't find Xu Qiu's thigh, so I determined the research field early.

At this time, she really wanted to say to Wei Xingsi: I regret it, I also want to do organic photovoltaics, not for the purpose of publishing articles, but simply because I am full of love for the field of organic photovoltaics.

But after thinking about it, I am a postdoc and I am getting a salary, so I have no choice but to see if there is any chance to hug my thigh in the future.

...

PS: Adding a new chapter after 0:00 am on Monday is counted as this week’s change. You should pay off the 4,000-word plus change of 100 monthly tickets and 2,000 recommended tickets. If there are more changes, you owe me.

PS2: At the end of December, there will be a double monthly pass activity on 29-31. My personal understanding is that one vote counts as two, so the monthly pass can be saved first, and then [vote for me].