I Have a Research Support System

Teacher Wei realized his gaffe, and took the initiative to explain: When I was working in the beautiful country NREL, I worked with Ma Weiwei for a while. She was my junior sister, but she transferred to another research group halfway. I thought She wants to stay in the beautiful country all the time, but I didn't expect her to come back without saying a word, without saying hello to me. At the end, he shook his head slightly.

Seeing Wei Xingsi's performance, Xu Qiu thought to himself: 'Teacher Wei and this Ma Weiwei seem to have a story. '

However, Xu Qiu was not interested in digging deeper. Anyway, one man and one woman, there are only a few possibilities.

So, he changed the subject casually: Now it seems that many foreign scientific researchers are going to China.

Yes, this has indeed become a trend. In the past, domestic talents kept running outside, but now they are slowly returning. Wei Xingsi added:

The main reason is that our country has attached great importance to scientific research in recent years, and has introduced many talent introduction policies including the 'Thousand Talents Plan'. If talents can be brought back to China, the treatment will not be much worse than staying abroad. .”

Xu Qiu answered, Then Teacher Wei...

Wei Xingsi interrupted: The reason for my return to China, on the one hand, is that the original research group at NREL, a beautiful country, has disbanded and needs to establish itself. This is an opportunity; I have to come back to take care of him. In addition, from the perspective of the general environment, the domestic scientific research environment is slowly improving. Although the domestic bureaucracy is a little heavier, this is the same anywhere in the world. Where there are people, there are people. There will be disputes, and there are people in the beautiful country who have to consider the sophistication of the world...

Xu Qiu nodded, this was the first time he heard Teacher Wei talk about his journey back to China.

It turned out that Wei Xingsi often went to the hospital on Fridays, not because of his own cervical spine problems, but because he went to take care of the elderly at home. I didn't expect him to be a filial son.

After that, the two chatted like friends for about half an hour, and Xu Qiu learned something about the scientific research circle in the beautiful country.

For example, the reason why many people never come back after staying abroad is because they have already integrated into the foreign environment, adapted to the rhythm of the foreign country, have their own social circle, and the main relatives at home have also immigrated. It is a familiar person, but returning to China is equivalent to going abroad.

For another example, when Mr. Wei said that the treatment will not be much worse than staying abroad after returning to China, the not too much difference refers to the reduction in treatment will be within 50% (calculated in the same unit of currency).

In the beautiful country, post-doctorate is a cheap labor force. The annual income of post-doctoral students in colleges and universities is generally around 30,000 US dollars, which is about 200,000 yuan.

The remuneration of teaching positions is better than that of post-doctorates. Assistant professors are the kind of positions that can be promoted or left after six years of assessment system. They can almost reach 6W-7W5 US dollars. More, in the other three months, you can pay yourself an extra salary, and you can get more than 400,000 soft sister coins every year.

Wei Xingsi had been in the beautiful country for nearly ten years before, mainly working in the NREL research institute, and his annual income before tax was about 100,000 U.S. dollars.

Monday, group meeting.

Feifei Wu went on to write a CM article on 2D Perovskite Devices Based on ITIC Transport Layer.

However, due to the impact of moving and going abroad this week, her progress has been slowed down a lot, and she is currently about 30% complete.

Wu Feifei’s other work is to directly spin-coat organic photovoltaic active layers on two-dimensional perovskite to prepare devices. It is found that when the thickness of the organic layer is relatively thin, the performance of the device will be slightly improved. In order to explain this phenomenon, she sent a sample It was tested by Feng Shengdong in Sweden, and the results are now available.

Feng Shengdong and the others found that a fluorescence resonance energy transfer (FRET) effect is formed between the thin organic photovoltaic layer and the two-dimensional perovskite layer, which may be the reason for the improved device performance.

At the same time, Feng Shengdong suggested that this thin organic photovoltaic layer be regarded as an effective layer, which can be distinguished from the previous work that directly used ITIC as a transport layer.

In fact, whether it is the transport layer or the effective layer, it is just a theory. In this work, the role played by the organic photovoltaic layer may be both.

However, it must be distinguished from similar work when expressing, otherwise it may be attacked by reviewers for lack of novelty.

Doing scientific research is sometimes like doing business. Good work is one aspect, and on the other hand, you must be able to publicize it to make others feel that your work is very good, otherwise the smell of wine will be afraid of deep alleys.

Duan Yun's group will still paddle. He has been a little depressed recently because of job hunting.

If he found an offer, Teacher Wei probably wouldn't stop him for an internship, just like Chen Wanqing went to Blue River two or three days a week, and Wei Xingsi didn't say anything.

But now Duan Yun doesn't have any offers, which is very embarrassing, so he can only stay in the research group and get mixed up first.

Sun Wo continues to write his ACSAMI article, and the current progress is about 55%.

His writing speed began to gradually increase. After all, his English foundation is not too bad, but he has not received special training in writing papers before, and now he is slowly starting to become proficient.

Tian Qing recently reached a cooperation with Ronald of Finland, intending to use the CELIV method to further explore the non-fullerene system in the group.

The two parties each chose a direction for research.

Ronald took a standard sample system, which is Chen Wanqing's PTB7-TH: IEICO system.

Their research group tried to use various CELIV methods developed by themselves to characterize the charge mobility data, interfacial recombination, trap state distribution, etc. in the standard sample system, and then obtain the overall charge transport kinetic information of the photovoltaic device.

Tian Qing chose three non-fullerene acceptor systems. The donor material is the donor material H32 developed by Han Jiaying before, and the acceptor materials are also ready-made materials in the group, ITIC, IT-2F, and IT-4F.

For these three acceptor materials, as the number of fluorine atoms introduced increases, the HOMO energy level of the material becomes deeper and deeper.

When the donor and acceptor are combined, the HOMO energy level difference between them changes linearly, from 0.15 eV to 0.10 eV, and then to 0,05 eV.

The device efficiencies of these three systems are all distributed in the range of 8%-10%. Although not high, it is enough, as long as it can be proved that the devices can work normally.

In addition to cooperating with Ronald to use CELIV electrical means, Tian Qing also intends to cooperate with Sweden Feng Shengdong to carry out mechanism research from another direction by borrowing TAS and other optical means.

Chen Wanqing made some progress in her work at Blue River last week. She tried several blended solvents as a scraping solvent, and finally found that on the basis of the original chlorobenzene, adding about 15% dichlorobenzene , which helps to obtain a thin film with better flatness, and finally, the device efficiency is increased from 7.33% to 7.62%.

At the same time, the stability of Blue River's machine has also been greatly improved. Before the production of ten devices, three, four, four or five were broken, either short-circuited or open-circuited. Now the yield rate can reach 90%. %.

Xu Qiu was entangled in various affairs last week, and the writing progress of the article was slow. The work on non-fullerene standard sample scraping coating effective layer, the target journal AM, is currently about 50% in progress, and he plans to hurry up this week Give the article to the liver, and then quickly voted it away.

There are still a lot of things waiting for him after that, and he can't spend too much time on small articles like AM.

Han Jiaying was also busy with various affairs last week, so she hardly did any experiments.

However, she is now deep in Xu Qiu's true biography. After conducting related experiments on H5 and J4 donor materials last week, she did not report all the content at the group meeting, but kept it handy.

Therefore, this time the group will just use it, including the CV test energy level structure, and a batch of device performance data.

Xu Qiu is thinking below, when the experiments of the J4 and H5 systems are almost done, let her try to synthesize the PTQ series donors that she thought of before, that is, the wide bandgap donor materials with a relatively simple structure. Fund project application to do preliminary work.

The experimental data of the IHIC and 4TIC materials developed by Shengnan Wu have almost been supplemented. These two are translucent systems. She has already started to sort out the articles, but she is not going to submit a large article. The target journals are JMCA and CM respectively.

After all, Wu Shengnan doesn’t have much time, and she will be out of the station in only two years. It would be best if she can publish top magazines like AM. If she can’t, a few more articles on JMCA and CM will be very profitable. of.

Xu Qiu was under the stage, and was also considering whether to ask her postdoctoral senior sister to help make the Y series receptors after she was almost busy, that is, on the basis of ITIC, by introducing nitrogen atoms to improve the co-receptors of the molecules. Yoking, the result of modification of the central D unit.

However, the Y series acceptors are somewhat special, different from the PTQ series donors. According to the results of Xu Qiu's current exploration in the simulation laboratory, the efficiency of organic photovoltaic devices corresponding to a Y series acceptor has reached 13%.

Xu Qiu feels that there is a high probability of a breakthrough in the direction of Y-series receptors, for example, the dual system can achieve 14% and 15%.

If this is the case, it is better to do it yourself. For general work, small articles can be left to others, but big articles must be in your own hands.

Mo Wenlin finished writing her third article on the ternary system last week and submitted it to ACSEL.

She reported on her future prospects, unswervingly continued to make ternary systems, and listed two new ternary systems.

It seems that they intend to eat all the freshness with one trick.

Speaking of which, Chen Wanqing is the originator of the ternary system in the group. The first work was the ternary blend system, and then there was a work on the ternary conjugated copolymer.

It's just that she is not very lucky. If she can meet Xu Qiu later, she can use the ITIC series to make three yuan, and it is estimated that she can publish AM as easily as Mo Wenlin.

However, having said that, if she met Xu Qiu later, the system like IEICO would probably not belong to her.