Chapter 444: The stacking efficiency exceeded 14%! Wei Xingsi in Parallel Time and Space

The review comments of "Nature·Energy" were returned, which disrupted Xu Qiu’s previous experimental planning. Originally, he planned to go to Jiangwan this week to do the synthesis of Y series receptor materials. Now he can only postpone it for a while and concentrate first. Take care of the article.
After returning to school, Xu Qiu and Wei Xingsi met and discussed each question raised by the reviewers in turn.
Fortunately, when the manuscript was submitted before this work, the experiment was done quite adequately. Xu Qiu did all the experimental characterizations he could think of at the time. The reviewer did not ask for additional experiments, and received a small modification opinion.
Otherwise, if it is a major change, it is estimated that the change will not be completed in a week or two.
Next, Xu Qiu continued to explode his liver for three and a half days, until Friday night finally corrected the article "Nature·Energy", Lin Lin always added up to a total of more than 20 questions, all of which were answered.
Because there are too many problems, Xu Qiu couldn’t even say thanking the reviewer enough. After using up the usual thank-you sentences, he could only change the adjective later, like this: "Thank the reviewer for the positive/valuable/relevant Views."
In fact, the workload is not small. The modification of the main body, supplementary text, and picture modification are not mentioned. The comment reply file alone is a 10-page WORD.
In other words, on average, two questions will fill a whole page of WORD.
The number of words in the reply document of this opinion adds up to more than 4,500 words, and the body of the article is only nearly 5,000 words.
Rounding up is equivalent to Xu Qiu's rewriting an article in three and a half days.
In fact, Xu Qiu would not be so attentive to the comments of reviewers if he usually submits to the top magazines in the first district such as AM, or other small articles in the second district.
But now it’s a big journal of "Nature" after all. Although it is a half-stop lower than the top three CNS journals, it still exists under the third journal and above tens of thousands of journals.
Perhaps only the top bosses may not care about scientific research results at this level.
Xu Qiu couldn't be so indifferent now.
After the submission was completed, Wei Xingsi took the initiative to say: "Xu Qiu, I have been working hard these few days. I just bought a few crabs at home. Come to my house to have a light meal at night?"
In fact, Xu Qiu is quite curious about the situation in Teacher Wei’s home. He has been in the magic city for more than five years, and has never visited the local people’s house in the magic city. However, he asked Han Jiaying in the evening, and he politely refused: thing……"
"Oh, that's all right," Wei Xingsi didn't forcefully invite: "You guys go out to eat tonight, right? I will ask for this meal, and then I will get the invoice for reimbursement."
Sunday.
Xu Qiu stayed at the Handan campus and did not go to Jiangwan for synthesis experiments.
He originally planned to continue to write "Joule" articles with a "full solution, translucent, and colorful" system, but when he turned on his laptop, before waiting for the code word, Wei Xingsi called him over.
‘The opinions on the article "Nature Energy" are back? It shouldn't be so fast. Xu Qiu muttered inwardly and followed Teacher Wei into 218.
While making tea, Wei Xingsi said: "The results of the Sino-Swiss STINT project previously applied for have come out, and we will receive funding for the project next year. A total of 200,000 funds, all of which are travel expenses, are dedicated to visits and exchanges. ."
"That's good." Xu Qiu casually responded: "After that, I can go to teacher Feng Shengdong in Sweden to communicate."
This project was written by him before and Feifei Wu, so I understand it better. What's more interesting is that if Xu Qiu and the others go to Sweden Feng Shengdong to communicate, the air tickets in the past and back will be reimbursed with Chinese funds, and they The consumption in Sweden is reimbursed by the funds of the Swiss side.
When I wrote the financial budget before, this item was almost wrong. The subconscious reaction at that time was that the Chinese side's expenditure was all from the Chinese side's expenditure.
"If you go to Sweden, you can also stop by Finland and visit Ronald. Anyway, they are all Schengen countries and only need to apply for a visa." Wei Xing thought for a moment and said:
"The schedule will be after we go to the beautiful country to attend the MRS meeting, almost next summer."
"Okay." Xu Qiu nodded in response. When applying for the Sino-Swiss STINT program before, he had also learned about the Schengen visa.
Schengen Visa (SchengenVisa) refers to a visa issued under the "Schengen Agreement", which is named after the agreement signed in the Luxembourg city of Schengen.
Time can be traced back to June 14, 1985, when Germany, France, the Netherlands, Belgium, and Luxembourg signed an agreement in the border town of Schengen in Luxembourg. The agreement stipulated the single visa policy of the member states.
According to this agreement, a visa issued by any Schengen member state is also considered valid in all other member states, without the need to apply for a separate visa.
The countries implementing this agreement are commonly referred to as "Schengen countries."
As of the end of 2013, the number of Schengen member states had increased to 26, including Sweden and Finland.
The Schengen Agreement divides countries outside the Schengen member states into three categories: positive list, grey list and negative list:
The positive list refers to all Schengen member states and other developed countries that are exempt from visas, a total of 30 countries;
Greylisting refers to the countries that some member states require while others do not require visas. There are 20 countries in total. Each member state decides whether or not to apply for visas for graylisted countries;
The negative list of countries refers to the countries that must apply for visas, a total of 130 countries, including flower growers.
Although the international status of flower growers is not low, due to historical reasons, most countries in the world, especially developed countries such as Europe and the United States, basically need to apply for visas in advance, and there are not many countries that can apply for visas on arrival.
According to 2016 data, the number of visa-free countries for the passport of flower growers is 50 countries, ranking 87th in the world.
The number one place is Germany, which is visa-free for 177 countries.
The second is Sweden, where 176 countries are visa-free.
The third is Finland, France, Italy, Spain, Great Britain, and 175 countries are visa-free.
The bottom five countries are Afghanistan, which is visa-free for 25 countries; Pakistan, which is visa-free for 29 countries; Iraq, which is visa-free for 30 countries; Somalia, which is visa-free for 31 countries; and Syria, which is visa-free for 32 countries.
Of course, these data will change every year.
Wei Xingsi continued: "In addition, it is almost the end of the year. The previous fund needs to write an annual summary report. Although this is still a month away, it can be written first. This year should be the last summary report, and the next time it will be written. The final report."
Xu Qiu nodded. This annual summary report is not difficult to write. The operation is similar to last year, which is to translate the articles he published into Chinese.
I still remember that the organic photovoltaic team was still writing this summary report last year. This year the team has expanded to five people, and the number of scientific research results has also greatly increased.
Wei Xingsi also put forward: "There are also newly applied fund projects. Don’t worry about key projects. When Gong Yuanjiang comes over, let’s look at the Jieqing Fund first. If you have time, I will find Wu Shengnan to connect with you, and try to end this matter before the winter vacation. Don't delay until the New Year."
"Before the Jiangwan laboratory was renovated, and the fume hood said that it has not received the final payment for the project. You can ask Feifei Wu to check it out. It is really impossible to let her go to the finance office."
"By the way, didn’t you become a teaching assistant this year? Now my course has a student visit to the laboratory and PPT presentations. The latter is counted as the assessment method for this course. You need to host it. Time me and them. The students are scheduled for Friday next week."
"..."
Xu Qiu once again harvested a bunch of miscellaneous things, some of which can be divided among others to help, some of which need to be handled by himself.
In fact, he has been thinking many times that it is not easy to do scientific research now. A lot of time has to be wasted on some "meaningless" things, which is really slow.
And this is still the situation of staying in school, if you often run around the world, meetings and exchanges, you will really spend less time on scientific research.
But if you do not do these "meaningless" things, many things will be affected. The most direct possibility is that you will not be able to apply for fund projects, and thus you will not be able to get money.
What kind of research can you do if you have no money?
This seems to be an unsolvable proposition. Perhaps only by reaching the top and becoming the boss of the head can you get rid of the nuisance of these trivial matters and concentrate on researching it.
Next, Xu Qiu first took Wu Shengnan to 218, briefly discussed the writing situation of the Jieqing Fund with Wei Xingsi, and put forward a few of his own ideas.
After that, he was busy writing the fund summary report, the part about his published articles, it can be regarded as an inventory of his own work this year.
It turns out that although the number of his articles this year has not improved much compared to last year, the grade of the articles has increased a lot, with articles of top journals and above accounting for more than 80% of the articles in a district.
It can be said that if you don't make a move, you will have an AM-level article, or even a super AM-level article.
Xu Qiu thinks that this kind of regular inventory of the work he does is quite meaningful.
Because he found that as the amount of work he has completed increases, even if it is an article written by himself, some details will be slowly forgotten after a long time.
For example, the previously made 3D-PDI material, after step-by-step optimization, finally got an optimal material, and the molecular structure of this material is difficult to draw directly without reading the original text.
Of course, if Xu Qiu is given the initial conditions and a few minutes, he can still get the optimal path at that time through deduction and analysis.
Although the details in the memory are missing, Xu Qiu has refined the scientific thinking behind it and kept it in his mind.
Just like some mathematical and physical formulas used in middle school, even if they are forgotten now, they can be derived manually through calculus and other methods.
For example, now let him use calculus to calculate the area formula of a circle, it is easy.
Speaking of this, Xu Qiu remembered a joke about a mathematician.
A mathematics professor at a university in Great Britain found that his sewer was blocked, so he hired a plumber to fix it.
After 30 minutes, the water pipe was unclogged.
The professor was quite satisfied with the plumber's performance, but when he saw the bill he couldn't help but yelled: "Why! You collected enough money in 30 minutes to 1/3 of my monthly income! I'm going to be a plumber!" .
The plumber said: "You can go. Our company is hiring people, and it also provides training. But you have to say that you just graduated from elementary school. The company doesn't like people with too high academies."
So the professor went to participate in training and became a plumber.
His income tripled.
He is much happier than before.
A few years later, the company suddenly decided to raise the education level of plumbers to graduate from junior high school, and asked all its workers to attend evening schools.
The first class in evening school is mathematics.
The teacher wanted to see how good the basics of these plumbers are, so he randomly selected someone to write the formula for the area of ​​the circle.
The professor was selected, but after working as a plumber for so many years, he has forgotten that the formula for the area of ​​a circle is πR squared.
So he had to derive from the beginning: divide the circle infinitely and integrate it. But his result is a negative πR squared.
The scene was a bit awkward, and the professor came again, but the result was still negative.
He was very embarrassed, so he turned his head and asked dozens of plumber colleagues sitting in the classroom for help.
I saw that these colleagues were whispering to each other, and they said to him: "Exchange the upper and lower limits of points."
On Monday, the group meeting.
Wu Feifei first reported that her JMCA article "Introducing ITIC Non-Fullerene-like Stacked Devices in Two-Dimensional Perovskites" was written and published.
In addition, the CM article "Two-dimensional perovskite device based on ITIC transmission layer" was rejected by the editor, and then transferred to AELM under Wiley. I originally wanted to transfer to JMCA under RSC, but the one I just happened to have was also JMCA. , So he turned to Wiley.
In fact, in the group, except for Xu Qiu's submission, most of his articles were accepted after revision. Only one time was rejected, and he was transferred from AM to AEM.
The process of other people's submissions is not so smooth.
For example, Chen Wanqing and Duan Yun have experienced repeated rejections and repeated revisions of articles.
This is why some people say that "every time you submit an article is to experience yourself." For most scientific researchers, it is the norm for the article to be rejected frequently, and repeated revisions are the most tormenting.
Sun Wo's ACSAMI job had already been voted last week, so last week he and Wu Feifei started a new job together.
The two of them took two undergraduates, Yu Ya and Yan Hu, to work together based on "two-dimensional perovskite-based translucent devices" and "two-dimensional perovskite-based true laminated devices", and worked with Xu The organic photovoltaic team on the autumn side conducts the docking.
Sun Wo reported on the results of the docking. He mainly studied with Mo Wenlin. Because of Xu Qiu's early work, Sun Wo directly used the optimized conditions, and the final result was not bad:
The efficiency of the translucent device under the two-dimensional perovskite standard system can reach 7%, and the average visible light transmittance (AVT) can also reach more than 30%.
The band gap of the two-dimensional perovskite material is wider than that of the three-dimensional perovskite, about 1.6-1.8 electron volts.
Therefore, the light absorption range of these materials is difficult to cover the entire visible light range. Like the standard materials selected by Sun Wo, the absorption edge is about 700 nanometers.
The light absorption range is relatively narrow and cannot cover the entire sunlight spectrum. This is originally a major disadvantage that limits its performance improvement, but it can turn waste into treasure in translucent devices, which can take this opportunity to achieve higher AVT.
Of course, the current efficiency data is still somewhat low for the two-dimensional perovskite, and further optimization is needed.
Duan Yun received the news that Warwick had passed the interview last week.
However, according to people familiar with the matter, Warwick’s approval will be censored, so the offer is determined. Passing the interview is useless. Passing the interview by Warwick is about equal to passing the resume screening of other companies.
For Duan Yun, this is not a bad thing. Now he has more than half a year to graduate, and he wants to find a good place for himself.
Because the offer has an expiration date, there may be longer ones up to six months, but there are also shorter ones, such as one month or even one week.
Once you get the offer, you need to make a decision within the time limit. If you push the offer off, the other party may not be willing to accept you.
Duan Yun also has a faint worry. It is said that the 35-year-old employees of Warwick will be optimized if they fail to rise up. Now I see that they are already 30+, and I don't know if they can adapt to the "wolf culture" over there.
In addition, there are three companies in Duan Yun's hands that have passed the first round of assessments, and are in the second and third rounds of interviews. There is also a guarantee from his hometown, Taicheng Vocational and Technical College.
According to Xu Qiu's observation, Duan Yun is somewhat inclined to go back to his hometown for development.
Duan Yun now has his girlfriend, brothers, and parents in his hometown, and there is also a factory at home.
Although it is said that those who do business are not making money, there is a factory in the family, which is not a bad family anymore.
In fact, if you have a foundation at home, it may be a good choice to stay away from the front line and return to the second and third line.
Many people come to the front line to chase their dreams because there is no guarantee at home, so they choose to fight in big cities with more opportunities. Anyway, there is nothing to lose.
However, having said that, if the family has security, it is not bad to come to the front line to work hard. If it is done, you can advance or retreat. Even if the hard work fails, you can choose to go home and inherit the family business.
Tian Qing has made preliminary progress in the study of the charge transport mechanism of three non-fullerene systems with linearly varying HOMO energy levels.
Mainly, Feng Shengdong from Sweden used TAS and other methods, combined with experimental data, to analyze, and drew several schematic diagrams of the mechanism, and used cartoon diagrams to show the various complex phenomena in the charge transport process under different HOMO energy levels. Time scale changes.
Xu Qiu still admires Feng Shengdong a bit, she is very productive.
In the past year, Feng Shengdong and Wei Xingsi's research group have joined forces and published many articles together. It is estimated that his assistant professor transfer is no problem.
Chen Wanqing has now signed an internship contract with Blue River and has begun to serve Blue River wholeheartedly.
She also participated in the group meeting as usual. Because of the partnership of Blue River, Wei Xingsi, and Xu Qiu, the senior sister happened to act as an intermediary to convey some of the progress made by Blue River.
During this period of time, Blue River Main Company was mainly doing the preparation and debugging work before the first generation of prototypes went on the market.
The Optoelectronic Materials Company has also opened up two new customers. Although it has not yet achieved profitability, with the gradual increase in the popularity of the organic photovoltaic field, the future prospects are promising.
The elder sister is also considered a veteran-level employee of Blue River. After she becomes a regular employee, she will be able to get some shares. After all, if she graduates, she will be the only doctoral student in the company, second only to Yang Qin, who was in the past of Modu Jiaotong University .
As for other master's students, although they arrived at the company a few months earlier than Chen Wan, on the one hand, they are all masters, on the other hand, they have no craftsmanship, which is equivalent to no work experience, and the senior sisters brought their own technology in the past. .
Xu Qiu had nothing to report this week. I applied for a visa last week, and then came back from the review comments of "Nature Energy". Wu Shengnan discussed the writing of Jieqing Fund.
The schedule is full and the experiment progress is zero.
Han Jiaying's J4 donor material AM article writing progress is about 60%, and at the same time a batch of PTQ1 has been synthesized.
Although the efficiency based on the PTQ1 device reached 12.8% last week, she suspected that the molecular weight of the PTQ1 material synthesized last time was not high enough. There is room for further improvement of this efficiency data, so she synthesized it again with a microwave reactor.
As a result, the performance of the newly synthesized material was not as good as last time, and the highest efficiency was only 12.0%, which made her very depressed.
However, this is also the norm in the experimentation process, full of various uncertainties.
It can be said that the only certainty in the scientific research process is uncertainty.
Xu Qiu helped her find the reason and found that although the molecular weight of the first batch of PTQ1 did not look high to the naked eye, the molecular weight was actually not low, and the number average molecular weight could reach more than 20,000.
The second batch of newly synthesized PTQ2 has a lower molecular weight, with a number average molecular weight of only about 16,000.
In addition, the elemental analysis results show that the ratio of each element in the second batch of materials has a more serious deviation than the theoretical ratio, indicating that the polymer molecules may have more side reactions during the synthesis process.
As for the school girl, why don't you do all kinds of representations first, find the reason and then do the synthesis, but choose the seemingly "slap your head to make a decision" to repeat the experiment directly?
This is because in the actual scientific research process, although there are various means of representation to assist, in many cases it is still based on visual observation and empirical judgment.
Because each characterization takes time, energy, and money, for some small research groups, because of insufficient funds, many times they choose not to perform characterization and rely on guessing, and the main consideration for school girls is time.
If when doing a synthesis experiment, each step of the reaction is performed with a nuclear magnetic field, and a complete set of infrared is performed before continuing the next experiment. It is estimated that it will take a month to synthesize a material.
Therefore, in order to save time, the common practice is to do the experiment first and then supplement the characterization.
And when the experiment fails, in most cases, they will choose to pretend that the problem does not exist and repeat the previous experiment without thinking, instead of hurriedly doing various characterizations to find the problem.
It is similar to restarting the computer to solve most computer problems.
Wu Shengnan posted 4TIC’s CM article last week. Now her work has been emptied and she has begun to devote her main energy to the writing of the Jieqing Fund. At the same time, she coached two undergraduates in the synthesis, characterization and device testing of FOIC materials. experiment.
Mo Wenlin has made some improvements in stacked devices this week, and her efficiency has been optimized to 13.4%, achieving 13.5%+12.3%=13.4%.
At the group meeting, Xu Qiu added a few ideas about laminated devices before, focusing on an effective idea that he had tested in the simulation laboratory.
That is, in the "two-terminal method" laminated device, the middle thin layer electrode is not used, but directly replaced by two almost transparent transmission layers, which can significantly reduce the light loss of the top cell device and greatly improve The current density of the top cell.
Based on this strategy, the latest results in the simulation laboratory, the efficiency reached 14.3%!
Xu Qiu suddenly thought of what the reviewer of the previous "Nature·Energy" article said: "The efficiency of 13% in the field of organic photovoltaics is not high, and 15% and 18% should be targeted."
Now look at it, it seems that 13% efficiency is really nothing great, 15%, or even 18% should be the goal afterwards.
Originally, Mo Wenlin had planned the fifth and sixth ternary systems before. Even if these systems cannot publish AM-level articles, they can also publish some small articles in the second district.
But now after seeing the benefits of lamination, Karen Mok and Xu Qiu applied for the suspension of the work on the ternary device, saying: "After the work on the ternary system at hand is published, the ternary system will not be implemented for the time being. "
In addition, Mo Wenlin was also very clever, and offered to "experiment her to do it, as long as Xu Qiu can leave her a mouthful of soup while eating meat", Xu Qiu naturally did not refuse.
Mo Wenlin's idea is also very simple. Although she doesn't know how Xu Qiu can achieve breakthroughs in the research field, it is enough to know that Xu Qiu can take her to fly. Follow the big guys and drink some soup. It's AM.
On the one hand, we say that the gap between people may be larger than that between people and Jinkela.
But on the other hand, for ordinary people, the difference between people is actually not that big.
The choice is greater than the effort. I found a good platform by following the right person. It is often better than the effort of staying in place and "humming".
For example, Xu Qiu actually changed the destiny of many people, including Wei Xingsi's.
Perhaps in a certain parallel time and space, Wei Xingsi returned to China for N years after UU reading www.uukanshu.com, but he was stuck in the "Qing Qian".
The best articles published in the group are AM and EES. The journals with N at the beginning cannot be published even by NC. Throughout the year, they publish five or six articles in District 1 and 2 in total.
Forty-three years old, applied for the Jieqing Fund, but failed to appraise;
Forty-four years old, applied for "Yangtze River", but still failed to appraise;
Forty-five years old, I want to apply for something, but unfortunately the age limit for "Jieqing" and "Yangtze River" has reached, and there is no chance.
You can’t apply for an academician. Although the age limit for an academician is 70 years old, it’s not even the "Jieqing" or "Yangtze River". If you want to skip the ranks of an academician, you don't need to think about it.
As a result, Wei Xingsi's enthusiasm for a big job after returning to China gradually faded, and what was left was to be a salted fish, and slowly aged care, drinking tea in the office every day, raising fish, and going abroad for exchange visits for a week and a half.
Life is so simple and unpretentious.