I Have a Research Support System

At eight o'clock in the evening, Xu Qiu went to 218 and reported today's test results to Mr. Wei.

"Hey, the efficiency has broken through 10%?!" Hearing the news, Wei Xingsi immediately stopped what he was doing, raised his head, and said with a smile: "Chen Wanqing worked on it for a long time before, but the efficiency has been stuck at 6% or 7%. Go, as expected, Xu Qiu is still on your way!"

"Uh..." Xu Qiu scratched his head, and defended the senior sister: "Senior Chen Wanqing has contributed a lot. Without her preliminary work, we still need to spend a lot of effort on the synthesis."

Afterwards, he handed the USB flash drive he brought to Mr. Wei and said, "Here are the detailed performance data of this test and my next synthesis plan."

"Very good!" Wei Xingsi opened the PPT in the USB flash drive, checked it carefully, nodded repeatedly, and finally commented: "The steady and steady style is very good, just follow your current plan."

The synthesis of donor materials was not mentioned in the PPT, so Xu Qiu added an extra sentence: "We also need to enrich the types of donor materials. There are not many wide-bandgap donor materials."

Wei Xingsi thought for a while, nodded and said:

"This is a problem. Over the years, many generations of donor materials with narrow bandgap have been developed. At present, the optimal system is PCE10, and materials with wide bandgap have not been favored by researchers because they do not match the fullerene system. , has been in a semi-stagnant state before, and there are not many existing wide bandgap materials, so it is indeed necessary to synthesize them by ourselves.

You came up with Han Jiaying's synthesis route in the group meeting before, or you had the foresight and planned it long ago, one after another. "

Xu Qiu gave a "hmm" and didn't respond much. His idea at the time was that as long as there were enough donor and acceptor materials, and through traversing through the simulation experiment system, he could find the optimal system that matched each other. Foresight, it does not conflict with Teacher Wei's statement.

Wei Xingsi leaned back, leaned on the back of the chair, and said with a smile: "To be honest, I never thought that the device performance of ADA's non-fullerene system could be so high. We started working on Zhenghong's "Nature·Materials" after it was published, so it's a bit late. As for now, we should be able to publish a lot of good articles, so we have to plan carefully..."

Xu Qiu nodded, and then said: "I plan to use PCE10: ITIC as the benchmark system. Now the efficiency can reach 8%. There is a high probability that I can publish an AM-level article, and then launch H22: ITIC, which is a breakthrough in efficiency. The 10% system can be further extended to other Hxx series, wide bandgap donors of PBDB-T system, and ITIC derivatives obtained by optimizing and improving IDTT and ICIN units."

"That's a good idea." Wei Xingsi understood Xu Qiu's meaning, and first delineated a PCE10: ITIC standard system with moderate efficiency. 8% is just right. Afterwards, for each improvement of the standard system, the efficiency only needs to reach 8%. More than %, you can send (water) an article.

After seeing the potential of ADA-type non-fullerene materials, Mr. Wei also had greater ambitions, such as whether he can impact the major sub-journals of "Nature" or even the main journal of CNS, so he tentatively asked Xu Qiu: "No Knowing that according to your optimization route, does the new material have a chance to break the world record of organic photovoltaics and achieve more than 12%?"

"I don't know exactly how much it can reach." Xu Qiu spread his hands and said, "However, the new system has a high probability of being able to achieve higher than 10%."

"I understand." Wei Xingsi nodded, knowing that he was too impatient, and then said: "Then let's advance steadily first. Let Wu Shengnan follow up Zhang Jiang's synthesis experiment. You first make these system devices and characterizations. After writing a few articles, the current device efficiency should not be as high as that of the major sub-journals of "Nature", let's submit more AM and EES first, and if it involves complex synthesis, we will submit to JACS or Angew."

"Okay." Xu Qiu replied, this coincided with his thoughts, and now he has the ability to pour water into the top journals of materials science like AM, of course, it is only temporary, when other people see their reports After the structure of the ITIC, we will definitely follow up in time.

Now there is still an advanced task of choosing one of the three. It is too difficult to publish the main journal of CNS. Putting it aside for the time being, the task of breaking the world record for efficiency and publishing ten articles in one district can be carried out simultaneously.

On the surface, breaking the efficiency is simpler, after all, it is already 10% now, and there is still the possibility of further improvement.

However, limited by the narrow light absorption range of organic photovoltaic materials, large energy loss, and short exciton diffusion length, for the field of organic solar cells, after the device efficiency reaches 10%, every percentage point after that is not small. The bottleneck, for example, has been stuck for six years from 10% to 12%, and the current world record of 12.2% has been stagnant for three years.

That is to say, unit D uses IDTT to replace IDT, and unit A uses ICIN-2F to replace ICIN. Although these two methods can increase the performance of the device from 6% to 9% and 10%, when the two are superimposed, The specific effect of the increase is not clear. There is a high probability that it will increase, but it may only be 0.5%, and the increase rate of 1% may not be certain.

The system requirement is to exceed the world record by 0.5%, which is 12.7%, which is already close to 13%. In fact, it is not so easy to achieve.

Of course, if luck is against the sky, it is not impossible to directly find a very NB material and achieve a jump in efficiency.

The perovskite photovoltaic system is a living example in front of us. It has been around since 2013. Not long after it was reported, the efficiency reached about 13%. It has reached 22%. It must be known that inorganic silicon solar cells have been developed for 40 years, and the current highest efficiency is only about 27%.

After discussing today's test results, Xu Qiu turned the topic to tomorrow's business trip in Jincheng: "There are also PPTs and speeches for our academic exchange at Kainan University in the USB flash drive, Mr. Wei, take a look and see if there is any problem .” Previously, Mr. Wei only carefully revised the abstract, but did not read the PPT and the speech.

"Okay." Wei Xingsi looked at the format of the PPT, adjusted the size and position of individual pictures, and changed a few details, without opening the speech to check, and then said:

"At that time, you should sit in the front row. If there are any specific experimental questions, I may need your help to answer them. By the way, our spraying method will not be disclosed at the conference for the time being."

"No problem." Xu Qiu nodded in response.

Every powerful research group more or less has some unique skills, which will not be easily revealed.

Even if the spraying method is a unique skill in the research group, when Xu Qiu wrote the experimental details in the article, he only used something similar to "We prepared the solution with chlorobenzene solvent, and spin-coated the effective layer solution at 3000 r.p.m. to obtain a thickness of about 105 nanometers." The expression "thin film" does not mention how it is spin-coated.

Of course, it is impossible to clearly express the details of each experiment, after all, it is only text, not video images.

"Okay, then go get busy first." Wei Xingsi paused, and then added: "We'll still meet at Zaiyi tomorrow."

Xu Qiu left with his USB flash drive. Out of the corner of his eye, he caught a glimpse of Mr. Wei turning off the communication PPT and re-opening his "Test Results and Synthesis Planning" PPT.

It seems that Teacher Wei still cares more about the results of this test than the next academic exchange.

It's also normal. This kind of exchange conference can't bring any substantial benefits to Teacher Wei.

For scientific research workers, it is necessary to forge iron by oneself. Only published articles and academic achievements are real.

At the level of Teacher Wei's "Qingqian", if you want to go further, your network can only be icing on the cake. It would be more practical to have a few more students like Xu Qiu.

In the three-day conference, the real meeting report time is only on Sunday. On Friday and Saturday, the landlord Gong Yuanjiang is in charge of "entertaining".

As for why the meeting was held on Sunday, it was mainly because Gong Yuanjiang considered Bazan's itinerary. It was not easy for him to come from the beautiful country, and domestic exchanges and visits were relatively more convenient.

Friday morning.

The high-speed train runs at nine o'clock, and it takes five hours to arrive in Jincheng after two o'clock in the afternoon. Xu Qiu and Wei Xingsi made an appointment at Caiyi 218 at seven thirty.

Xu Qiu got up at six o'clock and didn't prepare too many things. He only carried a schoolbag, a laptop and a set of clothes. It's summer now, and the clothes are relatively thin. His schoolbag is relatively large and can fit it.

Because lunch would be late, Xu Qiu had a big meal in the cafeteria before heading to Caiyi.

Xu Qiu arrived ten minutes early, unexpectedly, Teacher Wei had already arrived, and was packing his suitcase, stuffing some small pots of tea from the office into it.

After waiting for Teacher Wei for a while, the two arrived at the subway station on foot, took the subway line 10, and headed to Shanghai Hongqiao Station, and then encountered the morning rush hour. There were really many people...

However, you can only take the subway. If you drive by yourself, you will probably be blocked at this point in time and doubt your life...

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