I Have a Research Support System

After the small meeting on organic photovoltaics, everyone started to work.

In the inner laboratory, Tian Qing was preparing solutions, Mo Wenlin and Han Jiaying were testing devices, and in the outer office, Chen Wanqing and Wu Shengnan were coding at their desks.

Xu Qiu also stayed in the office. First, he fitted the test results of the exciton diffusion distance in the previous two days into the results of the simulation laboratory, that is, the results of ITIC and IDIC were 13.0nm and 19.2nm respectively. He didn't intend to let Tian Qing test the result of fitting the data again in reality.

After all, these two final results are fitted by about 500 data in the simulation laboratory, adding up to 1000 data. If it is tested again in reality, it will take at least ten days or more.

In fact, unwillingness to conduct repeated experiments is also the idea of ​​many research groups in China.

Large groups in China are fine, but for small groups, basically the repetitive experiments can be done according to the lowest standard, so just follow the lowest standard.

For example, in organic photovoltaics, many groups use the condition of "5 batches of different batches of devices, more than 20 device points", including when Xu Qiu first started.

Now, Xu Qiu's optimal system usually adopts the condition of "10 batches, more than 50 device points", and will send samples to NIM for third-party testing, so the data reliability is much higher.

When foreigners do experiments, the repetitive experiments generally exceed the minimum standard by a lot, and the stability of the data and the length of the error bars are relatively short.

This also leads to a problem of judging the falsification of the paper. If it is because the repeatability of the own experiment is not high enough, so that others cannot repeat it, how should it be judged?

You said he didn't make a fake, right? This result really cannot be repeated.

But you say he made a fake, the result was measured at that time, and there is no trace of artificial modification.

It's hard to judge.

This is why there is more and more emphasis on third-party testing when publishing high-quality articles.

Whether it is true or not, you can tell by testing.

After that, Xu Qiu sent an e-mail to the teacher in charge of allocating the machine time of the light source, applying for the GIWAXS machine time arrangement in September and the emergency time for the R-SoXS test.

In the email, he bragged about his work, "It is expected to publish a major sub-journal of "Nature". It is very urgent. The article is almost finished, and now the light source data is missing."

Although the article has not actually been written, and even the experimental characterization data is still more than ten items unfinished, but when it is time to blow up, we still have to blow up a wave, otherwise how can we take the time.

After finishing these two items, Xu Qiu heard the cheers from the school girl and Mo Wenlin from the direction of the laboratory: "The efficiency has exceeded 13%!"

Xu Qiu heard the sound and walked into the inner laboratory.

"Brother, the highest efficiency is 13.11%~" Han Jiaying said happily with a smile on her face.

Then she added: "The test is the J2:IDIC-4F system, and the area of ​​the baffle is 0.01 square centimeters."

The field of organic photovoltaics has maintained an efficiency of 12% for nearly four years. Today, the school girl successfully broke through and stepped up to 13%. Moreover, the J2 donor material was synthesized by herself. No wonder she is not excited. Woolen cloth.

"Not bad, not bad." Xu Qiu said a few words of encouragement, patted the junior girl on the shoulder, and then looked at the J-V curve on the computer.

The J-V curve is first flat and then rises, which is very standard. The photoelectric parameters next to it, the efficiency value is 13.11%, the open circuit voltage is 0.93 volts, the short circuit current density is 19.58 mA per square centimeter, and the fill factor is very high, reaching 0.72.

"The filling factor is very high..." Xu Qiu had an idea, thinking of the results of the exciton diffusion distance in the previous test, an idea to explain this phenomenon came into his mind: "The IDIC system has a long exciton diffusion distance, and can prepare thick Membranes and large-scale devices indicate that it has a high tolerance to the morphology of the effective layer thin film, which is conducive to improving the fill factor."

In the field of organic photovoltaics, the open circuit voltage is directly related to the bandgap width, the short-circuit current is directly related to the light absorption range, and is also indirectly related to the bandgap width. The fill factor is a comprehensive standard and is mainly affected by the morphology of the active layer.

Here, Xu Qiu linked the exciton diffusion distance with the filling factor, which is a point of view he put forward to explain this experimental phenomenon. It is not a proof in the strict sense. The point of view may be correct or wrong, but regardless No, as long as it can be justified, every new point of view can add points to the article.

In the case of non-big boss irrigation, if you want your work to break through the barriers of top journals such as AM and JACS, and reach the major sub-journals of "Nature" or the main journal of CNS, you need to accumulate bit by bit in the articles. At this point, it is difficult to use the method of setting up templates and filling journals in ordinary first and second districts.

Han Jiaying saw that Xu Qiu only commented a few words "not bad" and then fell silent, she couldn't help but turned her head and said, "Senior brother, you are so calm, this is 13%... That's right, you have already predicted this kind of situation before, senior brother." It worked out."

"Junior girl, let's continue to test. Maybe the other IDIC-M system is more efficient." Xu Qiu changed the subject with a smile, and did not explain that the reason for his calmness was that he had already been excited once during the summer vacation. The value in the laboratory is even higher than now, reaching 13.52%.

"Oh, the IDIC-M system has already been tested, and the highest efficiency is only 12.89%." Han Jiaying said happily: "I thought I wouldn't be able to reach 13% today, but I was pleasantly surprised when I turned around."

After chatting with the junior girls, Xu Qiu left the lab and went to 218. High efficiency is the biggest highlight of this job. He decided to tell Wei Xingsi the news, and at the same time communicate with Mr. Wei about what articles to submit for this job.

When Xu Qiu entered Room 218, he found Wei Xingsi was on the phone.

Teacher Wei's complexion changed, and he said with emotion: "I said Cao Cao will be there when he arrives. Yuanjiang, Xu Qiu just came over, let me ask him."

While speaking, he turned on the speakerphone, and Gong Yuanjiang's voice came from the speaker: "Okay."

Wei Xingsi asked Xu Qiu: "Gong Yuanjiang and the others said they need a batch of ITICs. How many ITICs do we have now? Do you have 200 mg?"

Xu Qiu thought for a while, and replied: "200 mg, there should be some."

ITIC belongs to the standard system. As a standard system, it means that each donor material must be combined with ITIC to make a batch of devices as a standard for comparison.

Therefore, Xu Qiu asked Wu Shengnan to synthesize more than 2 grams of ITIC at one time, and now there is still more than 1 gram that has not been used up. Dividing 200 mg will not have much impact on the research group.

Xu Qiu can probably understand the purpose of Gong Yuanjiang's visit, which is to seize the opportunity. The faster the work is completed, the higher the chance of publishing a good article.

At the same time, Xu Qiu also has to say that Gong Yuanjiang's actions are quite fast. The JACS article by AM and Xuemei he published before, both ITIC systems have just been proof (verified), and the article has just been published. After searching online, Gong Yuanjiang appeared.

200 mg of ITIC should be enough for Gong Yuanjiang and the others to normally prepare devices for a month or two. After a month or two, they will definitely be able to synthesize ITIC independently. After all, they have already imitated and developed ADA receptor materials derived from ICIN units. Now it is only necessary to synthesize the central IDTT, and there are ready-made documents for reference.

Once the large research group starts at full speed, the research and development capabilities cannot be underestimated.

However, they certainly did not expect that the materials on Xu Qiu's side have been iterated for several generations:

Narrow bandgap ADA acceptor materials include IT-4F, IDIC, IDIC-4F, etc.; donor materials also range from H22 to H43, and then to J1, J2; near-infrared acceptor materials include IEICO and IEICO-4F , IEICO-4Cl, and the FN-4F of the postdoctoral sister.

The efficiency data has also broken through step by step from 10%, 11%, and 12% to the current 13%.

It will take at least half a year or even more than a year for Gong Yuanjiang and the others to catch up with Xu Qiu's progress.

Wei Xingsi: "Then Xu Qiu, ask Mo Wenlin to send 200mg of ITIC to Yuanjiang and the others."

Gong Yuanjiang: "Okay, thank you. Xu Qiu should have something to do with you, so I won't bother you any more, bye."

Wei Xingsi: "Don't be polite to me, goodbye."

After hanging up the phone, Wei Xingsi smiled and said to Xu Qiu: "ITIC's influence is still relatively high. Since your two articles were proofed a few days ago, I have recently received emails from several research groups in China. , ask us about the ITIC situation."

Xu Qiu said "hmm", and Wei Xingsi asked casually, "By the way, why are you here looking for me?"

"Just tested the device, the efficiency is over 13%." Xu Qiu responded.

"13%?!" Wei Xingsi originally wanted to put the phone on the wireless charger, but one of them lost his grip and the phone slipped and fell to the ground. Fortunately, there was a carpet underneath, so the phone was fine.

Xu Qiu looked at Mr. Wei's funny way of bending over to pick up his phone, and while holding back a smile, he explained: "That's right, the specific value is 13.11%, J2: IDIC-4F system."

"13%, 13%..." Wei Xingsi didn't see Xu Qiu's weirdness, and couldn't stop repeating his feelings to himself. At last, he even closed his eyes, took a deep breath, and calmed down, like a very When he suddenly received a surprise, the blood all over his body rushed straight to his forehead.

For Xu Qiu, Han Jiaying and the others, this data is actually not that deep. After all, they have only been in the industry for more than a year, and they have always been smooth. They have never held back for half a year or a year. The experience of work has not improved at all.

But for Wei Xingsi, a researcher who has been working on photovoltaics for half his life, it is very meaningful and touched him a lot. He never thought that his research group could reach this step.

The breakthrough in efficiency from 12% to 13% can already be regarded as a milestone event in the field of organic photovoltaics.

This marks that the non-fullerene system has fallen far behind at the beginning, to the previous level, and now has achieved a comprehensive surpassing of the fullerene system.

At the same time, after being certified by a third-party testing agency, this progress will definitely be listed on NREL's "Highest Solar Cell Device Efficiency Chart".

NREL is the National Renewable Energy Laboratory of the beautiful country. It will update the world records of various solar cell efficiencies every once in a while. Once it is on the list, it will permanently become a point on the line chart and indicate the world record. Record the work unit where the birther is located.

Before returning to China, Wei Xingsi worked under a big boss in NREL, but he was mainly doing PDI, and the highest efficiency was only 5% or 6%. He usually looked at the names of other big bosses on it.

Today, Wei Xingsi finally had his chance.