Chapter 447: Xu Qiu: "I plan to try to hit the CNS once."

On Monday, at the group meeting, Wei Xingsi first notified everyone:
"The "Organic Photovoltaic Seminar" hosted by us will start next Monday and Tuesday, that is, December 13th and 14th."
"The teachers from other schools, including Feng Shengdong who flew over from Sweden, will come over on Sunday or Monday one after another. We need to do some preparations."
"Wu Feifei is mainly in charge of this aspect, including hotel reservations, and later I will send you the summary of other teachers' reports. You can design the posters and post them in advance."
"Okay." Wu Feifei nodded in response.
"Yeah." Wei Xingsi looked around: "Let's start the group meeting."
Wu Feifei and Sun Wo report first.
Now the perovskite team has two main tasks, semi-transparent devices based on two-dimensional perovskite materials, and laminated devices.
Among them, the processing technology of the translucent two-dimensional perovskite device has been further improved, and the device efficiency has been optimized to 7.5%, which needs to be further improved.
The progress of other stacked two-dimensional perovskite devices is not very smooth.
Because the effective layer materials of two-dimensional perovskite and organic photovoltaic, as well as the corresponding transmission layer materials, the solvents and processing methods used in the preparation are very different, and it can even be said that they are completely reversed.
For example, the effective layer of perovskite uses solvents such as DMF and DMSO with higher polarity, and the transmission layer uses relatively low polarity solvents such as chlorobenzene; while the effective layer of organic photovoltaic materials uses chlorobenzene. Low-polarity solvents such as chloroform and chloroform, while the transport layer uses high-polarity solvents such as methanol and formic acid.
As a result, Wu Feifei and others cannot fully refer to the experience in the preparation of organic photovoltaic stacked devices, and need to explore the processing technology of perovskite stacked devices by themselves.
Although there are many peer-reviewed literatures on the research of perovskite laminated devices in the world, it still takes time to convert other people's methods into their own methods.
The last thermoelectric work that Duan Yun submitted before was not rejected by the ACSAMI journal. He received a small comment. Last week, the article was successfully accepted, and he received a bonus of 1,000 yuan.
Now Duan Yun's graduation thesis has been written, and all the work on hand has been handed over and processed.
Although I am still struggling with where to develop, I don't have to worry about finding a job.
Therefore, he was leisurely all day long, and he was enjoying his last campus time.
According to Duan Yun, the doctoral students at the same level as him, except for about seven or eight unlucky ones who have been postponed, others have more or less received offers. No matter how bad they are, there are many opportunities for interviews or referrals.
Although it is a material major in the four major tiankengs, it is still more popular to graduate with a Ph.D. from Mordu University.
In large factories like Warwick, in the past two years, about 5%-10% of master's and doctoral students in the Department of Materials have passed, and this proportion is not too low.
There are also some large capital investment companies with strong funds. The company opened in the deep city, and then went to the magic city to "purchase", that is, to the top domestic universities such as the Magic City University, the Magic City Jiaotong University, and the Tongji University. There are dozens or hundreds of people in one move. The training is unified and the salary is very high.
Although Guangdong Province has two first-tier cities, the quality of colleges and universities is still worse than that of Kyoto and Modu.
Tian Qing continued to work on the "Research on the Charge Transport Mechanism of Non-Fullerene Systems with Linearly Varying HOMO Energy Level Differences", and began to write an article based on the test results of Feng Shengdong in Sweden.
However, because there is neither new materials, high device performance to support this work, nor too subversive discoveries, so I can only publish a small article to vote for ACSAMI.
Chen Wanqing brought some news from Blue River.
Now, the "first-generation film printing instrument" of the Blue River main company has been tested, and various procedures have been completed, and it is officially on sale.
At present, the function of this machine is relatively single, and it can only carry out the most basic squeegee operation, which is far from the "use one instrument to achieve multiple forms of film printing" envisioned by Blue River.
Therefore, the price of the instrument has not been set too high, and it is temporarily 5,000 soft sister coins.
Of course, for things like instruments, if R&D costs are excluded and only the material costs are considered, the gross profit is very high.
For example, the core components of this "first-generation thin-film printer" are a heating table, a control chip, a special ceramic scraper, a set of stainless steel frame and a plastic shell, and the total material cost is only a few hundred yuan.
R&D costs are the bulk. For a small amount of half a year of development for this instrument, staff salaries, site rental costs, material loss in the R&D process, etc., Lin Lin finally came up with more than six-figure expenses.
Moreover, scientific research instruments can basically only be sold to university research groups or research institutes in specific fields, and the audience is relatively narrow, making small profits but quick turnover difficult.
Therefore, instrument manufacturers are basically asking for prices, and they can sell one for each.
Similarly, the various high-end instruments monopolized by foreign countries, whether it is a photolithography machine, an electron microscope, or a nuclear magnetic resonance instrument, cost millions, tens of millions, or even hundreds of millions. Asking price", its own cost may be less than 10% of the selling price, and the after-sales service is also very expensive.
The same is true for drugs, which have a large premium.
This is the rule of the game in a world structure with peace as the main theme formed by the existence of nuclear deterrence.
Western developed countries have become "gentle". They no longer use thermal weapons to conquer the world, but instead reap the world's wealth through technological advantages.
In order to sell instruments, Blue River's internal employees have started to sell part-time and go to various laboratories for on-site promotion. At present, it is more convenient to start from the major universities and research institutes in the city.
For this kind of small start-up company, the initial stage is indeed very difficult, everyone has to act as a generalist.
Only when the team grows up, can the responsibilities be divided more carefully, such as opening pre-sales, after-sales, research and development departments.
Wei Xingsi directly contacted Blue River to purchase a "first-generation thin-film printer", which cost 5,000 yuan, which was not too expensive.
And Blue River also gave 68% off, plus tax only less than 4,000 yuan.
However, this ladder-hanging instrument will volatilize solvents during use, and either enter the fume hood or the glove box. There is really no place to put it in Handan. It can only be temporarily put in the Jiangwan campus for dust, waiting for the laboratory It can only be used if the whole is relocated in the past.
In addition, Blue River Optoelectronics Materials Co., Ltd. once again expanded a new customer, and several old customers also occasionally buy back.
Although it has not yet achieved profitability, it has been able to add one or two customers sporadically every week. The situation is slowly getting better, and the categories of materials are gradually enriching.
Finally it was Xu Qiu's turn, he had two heavy news to report.
On the first page of the PPT, Xu Qiu directly put the result of the JV curve and the device structure diagram: "Laminated device, efficiency, this is amazing, 14%, breaking the world record." Wei Xingsi stood up excitedly and looked at it. The image on the projection screen kept nodding.
"Before, YangYang and his team are very good at making laminated devices. I also visited their research group. Their equipment is very good." Wei Xingsi smiled and looked at Xu Qiu and said, "To be honest, they are making laminated devices. The threshold is still relatively high. I didn't actually have much hope for making laminated devices in the group, but now I didn't expect it to break through, which is very good."
Xu Qiu nodded in response. It is really troublesome to make laminated devices, and the processing technology is very complicated. He is also in the process of exploring, but he has a scientific research assistance system, which still has a great advantage in the exploration of this processing technology.
For example, with the current 14% result, the simulation laboratory saved him at least one month of experiment time.
Xu Qiu continued to report on the outlook for laminated devices: "Next, I plan to apply the 1D/2A ternary system to the bottom cell of the laminated device, by regulating the non-fullerene acceptor and fullerene in the ternary system. The ratio of the ene acceptor PCBM can precisely control the current density of the bottom cell and the top cell, thereby obtaining a laminated device with a more suitable current density, realizing a further breakthrough in efficiency..."
Wei Xingsi was slightly surprised when he heard the words "three-element system".
But when he finished Xu Qiu's report carefully, he sat back in his chair and thought about it for a moment, then he understood the joints, and said with satisfaction: "Wonderful, this method is really good, it's worth a try."
Xu Qiu let out a "huh", turned the PPT page, and threw another heavy news: "Based on the Y series receptors, J4: Y3 system, the efficiency has reached 14.5%!"
"How much? 14.5%?!" Wei Xingsi just sat down and bounced from the chair again, staring at the projection screen carefully for a long time, and even asked a little nervously: "Is there no water in this data?"
"If there is no water, it is all real data," Xu Qiu seriously responded: "Based on this system, the efficiency value fluctuates little, with 70% of the data points, and the efficiency is more than 14%."
"Huh—" Wei Xingsi took a long breath, tilted his head, stretched out his hand and kept touching his non-existent beard, saying something in his mouth: "Short-circuit current density is 25.31 milliamperes per square centimeter, open circuit voltage is 0.82 volts, fill factor 0.70, photoelectric conversion After about half a minute's efficiency, Wei Xingsi's beard stroke was stagnant, and he said to Xu Qiu: "That's it. After the group meeting, Xu Qiu, you come to my office and discuss it together. "
Afterwards, he looked around and said in a stern tone: "You must keep this result confidential, and you must not disclose it to anyone outside of the research group, you know?"
After speaking, Wei Xingsi looked at Mo Wenlin and the four new undergraduates in turn. After receiving their nodding responses, he signaled that the group would continue.
Seeing this state of Wei Xingsi, Xu Qiu couldn't help but muttered in his heart. Fortunately, Teacher Wei had no heart problems. Otherwise, he would be shocked by the result, but it would be bad. He didn't want to become an "extrajudicial fanatic Zhang San".
It seems that in the future, we still don't want to surprise Teacher Wei continuously, we need some buffering.
The photoelectric performance data based on Y series acceptor devices are indeed very powerful, especially in terms of short-circuit current density.
Traditional devices based on the PCBM system, the short-circuit current density can reach 20 mA per square centimeter is a very rare result, generally at 18, 19, more than 20 mA per square centimeter is considered a "explosive meter", and here In this case, the open circuit voltage is usually not high, and may only be 0.6 or 0.7 volts.
Now, not only the short-circuit current density is more than 25 milliamperes per square centimeter, the open-circuit voltage can also reach 0.8 volts, and the final device efficiency is naturally very high.
Xu Qiu speculated that one of the reasons for this situation is that the ITIC series, and even the Y series non-fullerene materials later, can achieve good charge splitting and transport without high "driving force".
The driving force of the PCBM series is generally above 0.3 eV, which corresponds to an open circuit voltage loss above 0.3 volt on the device.
However, the current non-fullerene system only needs an energy level difference of less than 0.1 eV to achieve good charge splitting.
In other words, under the same conditions as other conditions, the open circuit voltage of these non-fullerene systems will be inherently higher than the traditional fullerene system by about 0.2 volts.
Regardless of the fact that it is only 0.2 volts, it feels very little. If the base is 0.6 volts, if it is increased to 0.8 volts, it is equivalent to a full one-third increase.
Reflected in the device efficiency, it may be the original 10%, changed to the current 13.3%, this increase is still very exaggerated.
Han Jiaying finished writing the AM article of J4 donor material and voted it out last Thursday. Then, she began to write the article of H5 material, the target journal JMCA, and at the same time performed the relevant performance characterization of PTQ1 material.
Now the school girl's writing ability has improved a lot, and she doesn't need Xu Qiu's help to rewrite it. She has a good foundation in English.
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Language learning, the foundation laid in the initial stage is still very important, and it is more difficult to improve and upgrade the day after tomorrow.
For example, Senior Sister Chen Wanqing wrote so many articles back and forth, and Xu Qiu still feels a bit spicy after reading the articles.
Speaking of which, many people in China suggest lowering the proportion of English in the middle school curriculum, lowering the scores of English subjects in the college entrance examination, canceling the English test, and so on.
Some people think that English is useless for most students, but it takes up a lot of students' study time.
Some people think that English is a language subject, which requires talent. If you don't have talent, you won't be able to learn it.
Others claimed: "If it weren't because I had only scored 50 points in English for the college entrance examination, I would have gone to Qingbei University, and now I can only go to an ordinary 211."
But the reality is that, for academic masters, the subject that can ultimately widen the gap in the scores of the college entrance examination is actually Chinese.
Looking at the score structure of Xueba at around 700 points, mathematics is almost a perfect score of 150, at most one wrong choice is 145, English is generally 140+, Chinese is 120-140, and science is 280+.
Among them, the language difference is the largest, and it is also the most difficult to score.
On the other hand, English may be the only course that can continue to play a big role after graduating from college and leaving campus.
Those who choose to study for postgraduate studies don’t say it. The importance of English is even more important than professional courses.
If you choose to work, being proficient in English can also give you one more way to break the involution, which is to go out and earn foreign exchange.
Moreover, many job opportunities require proficiency in English, but few have heard of proficiency in mathematics, Chinese, physics, chemistry, and biology.
Of course, the impact of other subjects on people is invisible, such as mathematics, physics and chemistry can improve logical thinking ability, Chinese can improve eloquence, etc., but these abilities can hardly exist as a threshold.
English is a real threshold for certain industries, such as high-end service industries and foreign companies.
Most people are ordinary people, and there is not much difference in ability. Even if a 985 undergraduate is taken out to compete with nine general undergraduates, excluding the consideration of school origin, that 985 student may not be able to stand out.
But in the actual job search process, "985" may have won out of these ten people.
Proficient in English is a similar situation.
Wu Shengnan coached two undergraduates last Monday to carry out experiments on the synthesis, characterization and device testing of FOIC materials.
On the other hand, I am busy with the preparation of the Jieqing Fund application. The application is roughly divided into three progressive parts-the development of near-infrared receptor materials, translucent devices, and laminated devices. Now these three parts have Preliminary work serves as support.
Writing a fund application is still a cumbersome task. It is more troublesome and laborious to write a book as a chief writer than to write a large SCI article. After all, the quality of the book is directly related to whether you can apply for funds, so in all aspects Must be the ultimate.
Fortunately, Xu Qiu was only responsible for putting forward some guiding opinions, but it was relatively easy.
Mo Wenlin achieved 13.5%+12.3%=14.0% in stacked devices this week, which is considered a big breakthrough.
However, Xu Qiu said everything that should be said. She just reported on the progress of her ternary system. The system based on it has an efficiency of 12%+.
Finally, it was the turn of the four undergraduates to report.
Although they are all cute and new, they are all very motivated and motivated to learn. Now they have been in the group for nearly two and a half months, and they can basically be used as half of the labor.
This is also mainly because they only spend two or three days in the research group each week. If they work for five or six days, everyone can be equal to one Sunwo.
After all, the threshold of scientific research is high and high, and low and low.
In terms of individual experimental operations, there is actually not much technical content. If the skilled workers on the assembly line are brought over for training for one month or two months, basically everything that should be learned can be learned.
The most important thing is to look at the scientific research thinking and ideas behind it.
This is why when posting an article, the person who gave the idea and the person who wrote the article is usually considered to have made a greater contribution and will end up with one article, while the actual work and experimenter's contribution is relatively small and will hang up the second article.
After the group meeting, Xu Qiu followed Teacher Wei to Caiyi 218.
Wei Xingsi handed Xu Qiu a bottle of Paris water, then opened the swivel chair next to the desk and said with a smile: "Come on, sit here, and talk about the two systems with an efficiency of 14%."
Xu Qiu was not polite, unscrew the cap of Paris water, took a sip, and moistened his throat.
Isn't this just soda, the faint taste of lime...
It doesn't seem to be wrong either, they really sell soft drinks.
Xu Qiu explained in detail the optimization process of laminated devices and Y series materials, and the subsequent planning:
"...After that, my experimental plan..."
"The Y series acceptors mainly modify the central DAD unit, keep the D unit unchanged, and modify the A unit. It is planned to use BT, NTT and other structural units to replace NT..."
"Laminated devices, in addition to using the effective layer of the ternary system as the bottom cell, adjusting the blending ratio of the ternary system, and the thickness of the top cell and bottom cell, I plan to improve the transmission layer materials at the same time..."
"For the specific plan, I found a better transmission layer material, M-PEDOT, which can replace the ordinary PEDOT used before..."
For these tasks, Xu Qiu didn't plan to count on Mo Wenlin completely. It's okay to let her do the preliminary experiments, but the subsequent experiments will mainly rely on her own.
After all, Mo Wenlin is just a newcomer who hasn't just started for a long time. In many cases, she will only passively execute instructions and can't make improvements on her own.
Xu Qiu set himself a small goal. Before the winter vacation, at least one of the two systems must achieve a breakthrough, with an efficiency of over 15%.
Although the performance of the Y series in the current simulation experiment system has reached 14.8%, which is higher than the 14.5% of the laminated system, Xu Qiu is more optimistic about the laminated system, because the Y series materials require a workload if they want to change the molecular structure. bigger.
The laminated system only needs to adjust the process, relatively speaking, it is easier to play the advantages of the system.
Wei Xing couldn't help but nodded. At the end of hearing, his eyes flashed: "So, there is hope that the efficiency of both systems will be 15%?"
"Well, very hopeful." Xu Qiu said confidently: "I plan to try to hit the CNS."
"It's no wonder that you asked me how much bonus I received for sending CNS. It turns out that I was already in my mind." Wei Xingsi smiled and proposed: "Why do you want to combine the two paths and make the Y series stacked? Will this happen? It will be more secure, and the results will be faster."
Xu Qiu thought about it for a moment~EbookFREE.me~ responded:
I plan to use only the ITIC series for the stack first. On the one hand, it is a perfect ending for the ITIC series. On the other hand, the main consideration for stacked devices is the bottom. The complementarity of the two systems of battery and top battery does not necessarily mean that the dual system has good performance and is suitable for stacking."
"Um...Okay, I'm impatient, just follow your ideas." Wei Xingsi changed the conversation: "By the way, next Monday's'Organic Photovoltaic Seminar', I intend to let you represent our research group at the conference. Can you give a presentation at the conference?"
Xu Qiu was stunned for a moment. He had never thought that Teacher Wei would let him speak.
The specifications of this report are still relatively high, no less than the meeting organized by Gong Yuanjiang last time, and he is also the host organizer. If the game is broken, it will be a shame.
However, this is a very good exercise opportunity, which can also be regarded as a preview before going to a beautiful country to participate in the MRS meeting.
Thinking of this, Xu Qiu responded: "I can."
"Okay." Wei Xingsi nodded: "Then you prepare a PPT, the duration is about half an hour, and then confirm with Wu Feifei about the specific schedule."