Chapter 408: "All Things" Tian Qing

Tian Qing usually likes to travel everywhere, and besides Wei Xingsi, she is also the only one in the group who has been to a beautiful country before.
Therefore, after Wu Feifei returned from Teacher Wei's office, together with Xu Qiu and Han Jiaying, asked Tian Qing how to apply for a passport and visa.
Tian Qing talked freely: "I got my passport and visa to a beautiful country when I was on a graduation trip more than a year ago."
"In the case of a passport, I took my ID card directly to the Exit-Entry Administration Office of the Modu Public Security Bureau, took pictures on the spot, filled out the application materials, and then followed the WeChat official account and waited for me to go home."
"After a period of time, you can check the results on the WeChat official account."
"After confirming that you can get your passport, go to the Exit-Entry Administration Office again, bring your ID card, and pay 200 yuan for the cost of the passport, then you can get the permit."
"Passport processing is relatively fast, usually within a week or two. In addition, I remember that the money must be cash."
"For the visa, I directly got a 10-year B1/B2 tourist visa at the time. I was lucky enough to pass it quickly without being checked by the Check."
"When you apply at that time, in order to prevent being checked, you still need to reserve some time, at least one month before departure to apply, so that there is no need to worry about any accidents."
"After all, the place to apply for visas is at the Consulate General of the Beautiful Country in the Magic City. They are special. They have holidays on weekends and holidays in China, and they also have holidays on holidays in Beautiful Country, so you know..."
"But don't worry too much. After all, you are invited by the MRS organizer. With an invitation letter, the probability of a successful visa application is relatively high. Specifically, I will take you to do it when your passport is issued."
"Okay, thank you." Wu Feifei and others echoed one after another. It's not bad to have a "jack of all trades" like Tian Qing in the group.
In fact, Tian Qing knew better than Wei Xingsi on passport and visa matters.
Because Mr. Wei obtained a green card from a beautiful country while working at NREL, and retains the nationality of a planter, he does not need a visa to go to a beautiful country.
However, the green card is a symbol of permanent residency in the beautiful country. If the green card holder shows the intention to give up the right of abode, such as not in the beautiful country for 183 consecutive days, or without tax filing records, the green card may be cancelled and taken back by the immigration bureau.
Therefore, Wei Xingsi goes to the beautiful country to play cards twice a year. There is no academic achievement in the previous group. After returning to China, he has not participated in the MRS meeting. He usually takes a beautiful international travel tour during the winter and summer vacations.
Now, if you have been able to participate in the MRS meeting afterwards, you don’t need to go there twice a year.
After clarifying the matter of going abroad, Xu Qiu opened the key project application form written by Teacher Wei and checked it.
Wei Xingsi wrote a lot in the introduction, and it looks quite exciting.
Xu Qiu didn't expect Wei Xingsi to stay abroad all the year before, and his ability to write Chinese texts was so strong.
But after thinking about it, Mr. Wei wrote his first book after returning to China.
If you don't have two brushes, how can you get millions of start-up funds?
However, for the specific experiment part that follows, Mr. Wei only briefly wrote and did not elaborate.
Xu Qiu guessed that Teacher Wei probably wanted him to supplement.
According to the previous plan, this book is roughly divided into three parts. Gong Yuanjiang is responsible for the synthesis of small molecule donor materials, and Wei Xingsi is responsible for the synthesis of polymer donors and non-fullerene acceptor materials.
Therefore, Xu Qiu added some content based on the results in the simulation laboratory III these days.
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On the one hand, he provided a specific synthesis scheme for non-fullerene receptors. The A unit is still a derivative of ICIN, and the D unit is introduced into the nitrogen atom, which is firstly nitrated and then reduced to an amino group. A secondary amine connection is formed between adjacent five-membered rings and six-membered rings, which not only obtains a condensed ring structure, but also introduces side chains and maintains a good stacking structure between molecules.
The molecules of this series are named Y series molecules, and the device performance of Y1 molecules has reached more than 10%.
On the other hand, Xu Qiu decided to work towards simplicity in the design of body materials.
The main consideration is that the main light-absorbing substance of the current non-fullerene system is the acceptor, and the donor material may not need to be "too good" to achieve excellent performance.
The structure is still a D-A copolymer, in which one D unit is a simple thiophene unit, and the other A unit is modified based on the same simple BT unit.
The BT unit is benzothiadiazole. The benzene ring at the bottom can introduce fluorine atoms, and the thiadiazole connected at the top can be replaced with a six-membered ring, which is connected by two nitrogen atoms, so that there are two sites on the top. The introduction of alkyl side chains is used to improve its solubility. Xu Qiu named this type of donor molecule PTQ series.
Improving the fund book still consumes more energy. Xu Qiu has been busy all day, adding three pictures and three paragraphs of text. It was not until the evening that the work was done and he sent it to Wei Xingsi by email.
On Monday, the group meeting.
Xu Qiu published the AM article of IDIC system, and once again I like to mention 4000 yuan bonus.
Before the start of the group meeting, Wei Xingsi asked: "How are the performances of several undergraduates?"
Wu Feifei first said: "Yu Ya and Yan Hu are both good."
Han Jiaying and Wu Shengnan then said: "Yin Houlang and Xu Xinjie are also good."
Wei Xingsi nodded and said: "Then the next time the team will notify them to participate together, we will hold the team meeting in the third floor conference room of Caiyi. Today we will do this first, Wu Feifei, you can start talking."
Feifei Wu began to report:
From the JV curve, it can be seen that the hysteresis of the two-dimensional perovskite system based on the thiophene ethylamine organic spacer layer has been significantly suppressed. The current article writing progress is about 50%. AFM..."
Xu Qiu wondered to herself that Wu Feifei's system was actually okay, but it suffered from low efficiency.
At present, the world record of 2D perovskite in the world has reached more than 15%, and it has been difficult for the group to break through 12%. Therefore, the group can only be conservative when submitting articles. If this efficiency can be higher, For example, if you reach 12% or 13%, you still have a chance to rush AM.
However, there is no way. Wu Feifei and others have tried very hard to repeat the experiments of several large groups, but they just can't repeat them.
There are many possible reasons. Perhaps several leading groups have deliberately or unintentionally concealed key experimental operations. Perhaps the group’s organic and perovskite are prepared together, and the organic solvent vapor used affects the perovskite devices. The film formation, or is it due to other reasons.
In the experiment, many times it is not clear. Therefore, the same instrument may be moved a place, and the test results will be completely different.
Wu Feifei continued to report: "In addition, after discussions with Xu Qiu last week, the two experimental ideas we got, both of which were preliminary attempts."
"One of them is to use ITIC series non-fullerene acceptor materials to replace traditional PCBM and C-60 as the transmission layer of the perovskite system. The results currently seem to be good, whether it is a three-dimensional perovskite or a two-dimensional perovskite. The mine’s standard sample system and device performance have both increased slightly. Later, I plan to explore whether the stability of the device has improved. In theory, the stability of the ITIC system is better than that of the PCBM system."
"Another idea is to make the concept of quasi-laminate, that is, spin-coating an organic effective layer directly on the upper layer of the two-dimensional perovskite. For the time being, there is no effect. It may be necessary to further optimize the processing technology, such as the upper effective layer The film is thinner."
"Yes, yes, everyone remembers to communicate with Xu Qiu more often." Wei Xingsi nodded in satisfaction. He even wondered whether Xu Qiu should also be responsible for doing perovskite at the same time.
But after another thought, forget it. There are so many things to do in organic photovoltaics. One's energy is always limited. And the current progress in the field of organic photovoltaics is very good. In case Xu Qiu transfers to perovskite Over there, it turns out that the water and soil are not satisfied, then the gain is not worth the loss.
Duan Yun worked on the article for several months, and finally finished it, first voted on ACSAMI to see the situation.
Now Duan Yun is almost in a free-range state, mainly writing graduation thesis, listening to various presentations and casting resumes on the Internet, and occasionally exchanged with Feifei Wu about the use of the thermoelectric instrument he built.
It is a pity that Duan Yun's current job search process is not ideal, and there are still zero offers.
With the support of Yu Ya and Yan Hu, Sun Wo has accelerated the progress of the experiment. Now the experimental characterization test of the first work has been completed, and the article is ready to be sorted.
However, Sun Wo is sometimes struggling to even read documents written by other people, and it is even more difficult to write articles by himself.
This is not all Sun Wo's own problem, mainly because the perovskite system lacks the material synthesis step, UU read www.uukanshu. Most of the com materials are commercially available, so in the article, the phenomenon of routine is not as obvious as the organic photovoltaic field, and the difficulty of reading is slightly higher than that of the organic photovoltaic article.
Therefore, Wei Xingsi's requirements for Sun Wo are not high, and the first article started from the group's lower-limit journal ACSAMI to practice submission.
Tian Qing continued to organize the work of "exciton binding energy and exciton diffusion distance of multiple systems". The target journal ACSEL, the progress of the article is about 40%.
Chen Wanqing went to the Blue River for three days last week, and the number of presentations he attended was not as positive as before.
Wei Xingsi also teased: "You are planning to go directly to the Blue River for an internship."
The elder sister nodded with a smile, and did not answer the conversation, which was considered a tacit consent.
Teacher Wei is not disgusted with this. After all, his students can find a good job, which is worthy of happiness.
However, the flexible, translucent, colorful, squeegee, and full-solution processing system that the school sister is responsible for is still in the bottleneck, and the device efficiency is stuck at 6.5%.