I Have a Research Support System

After the test, Xu Qiu returned to the office to announce the good news to Chen Wanqing:

Sister, the highest efficiency of this batch of devices is 5.19%.

How efficient...how much?! Chen Wanqing asked excitedly.

5.19 percent. Xu Qiu paused every word.

It's really broken 5%. Chen Wanqing still had a look of disbelief.

Here, the data is here, you can see for yourself. Xu Qiu handed over the USB flash drive, I didn't see you like this when I measured 10% before, why are you so excited about 5% now.

That's different. This is a new material we developed together. My previous psychological expectation was to break 4%. Now it's one more percentage point, with 5% efficiency. The probability of this job being AM is very high. It's gone. Chen Wanqing's eyes were blurred, and she said with a silly smile: Hey, I'm also a woman with half a foot in AM.

I still have two feet... Xu Qiu said halfway, but realized that the words seemed unlucky, so he stopped his mouth in time, and said earnestly: Senior sister, don't set up FLAG indiscriminately, and be careful of misfortune coming out of your mouth.

Student, what are you talking about, what FLAG, what disaster comes out of your mouth, it doesn't exist. Chen Wanqing put her hands on her hips, speaking very fast, and scolded Fang Qiu: I'm going to eat this AM, even Jesus Can't keep it, I said.

Xu Qiu was speechless, and gave the senior sister a caring look.

Chen Wanqing acted as if she hadn't seen it, and suddenly put her hands on her chin, leaned towards Xu Qiu, blinked and said, Student, do you think 6% has a chance?

I don't know, Xu Qiu shook his head, Perhaps changing to other wide-bandgap donors has the opportunity to improve the performance, but we haven't. The initial optimization result given by the system is 5.48%. Not sure, most likely yes.

That's true. In the structure of FTAZ, BDT is directly connected to an alkyl side chain, not even a thiophene ring. I don't know how to design this structure. Chen Wanqing thought for a while and said:

However, the world record of the A-D-A system at this stage is about 6%, and our 5% is enough. Anyway, the A unit we use is brand new.

In the next few days, Xu Qiu helped the senior sister optimize the device based on the preliminary results of the simulation experiment system. At the same time, he asked Tang Yunkun and Feng Shengdong for some mechanism-related literature to supplement his own shortcomings in the charge transport mechanism. .

In addition, he took the time to read his article twice, and polished it a little, only waiting to supplement the results of TAS and GIWAXS.

Thursday.

Xu Qiu has made three batches of devices in total, and has gradually optimized the efficiency of the senior sister's FTAZ:IDT-ICIN system from 5.19% to 5.86%, which is half a body away from the world record (6.02%) of the existing A-D-A system. (0.16%); the efficiency of the PCE10:IDT-ICIN system was also optimized to more than 4%, reaching 4.13%.

During this period, Xu Qiu did not use the power of the simulation laboratory, mainly to exercise his own ability, not to save points.

Teacher Feng Shengdong sent a message to Xu Qiu, saying that he had received the samples of TAS, and now began to arrange the test, and try to get the experimental results and write the description part within three days.

Han Jiaying's third-generation B4T-5/6/8 series of 3D-PDI molecules have been synthesized, and she also synthesized the third-generation B3T-6 series of 3D-PDI molecules, which are used to compare with the first and second-generation B3T-6 A series of molecules were compared.

Chen Wanqing saw that the device efficiency data was increasing steadily every day, and her work efficiency in the experiment was directly increased by 20+%. It is short of TEM on Friday and GIWAXS on Saturday.

However, she has been busy doing experiments this week, and most of the data is only in the state of raw data, and has not had time to process it.

Xu Qiu copied several materials synthesized by Han Jiaying into the simulation laboratory II, and began to explore the performance, and then entered the laboratory with the school girl to prepare light source samples, starting from cutting silicon wafers.

Early Friday morning.

Xu Qiu entered the Simulation Lab II to check the results.

Xuemei's B4T-8 series of 3D-PDI acceptors and PCE10 donors have the highest efficiency in organic photovoltaic systems.

The highest value is 9.17%!

The highest efficiency has really exploded, and it hasn't been warmed up yet. Xu Qiu muttered, But at least I had it once.

Xu Qiu's mentality is very relaxed. Even if the school girl is doing better, the article she posted is also a second author. Rounding it up, it is probably equivalent to breaking her own record.

And he is not very surprised by this result, after all, Xuemei's second-generation 6 series has a maximum efficiency of 7.5%, and now it is the third-generation 8 series, which uses the two-step molecule that is quite effective in Xu Qiu's system Structural optimization methods - side chain modification of nitrogen atoms, introduction of selenium atoms, soaring efficiency is also normal.

Moreover, in this simulation experiment, Xu Qiu integrated all the device processing strategies of the previous 3D-PDI system, spent twelve hours, and tested hundreds of conditions, in order to improve the efficiency directly in one step.

In other words, if you want to further optimize the processing conditions of the device to increase the efficiency, there is not much space, and the upper limit of the performance of the material has basically been reached.

If you want to further improve, unless you broaden the donor library or subvert the existing coating method.

The former is easy to understand, but it takes time to accumulate.

The latter refers to the special coating methods developed by researchers, including the thermal spin coating method developed by Xu Qiu; there are also some reports in the literature, such as the layer by layer spin coating method, which is The donor and the acceptor are spin-coated twice separately; the inverted coating spin-coating method, in the final process of spin-coating film formation, the substrate is rotated face-down, etc...

There are only a few sporadic articles about the special coating method. After being reported, there are almost no imitators, and the effect looks mediocre.

For example, an article by ACSAMI uses the inverted coating spin coating method. They use the standard PCE10:PCBM system, and the device efficiency obtained by normal spin coating is 8.0%. After inverted coating, the efficiency is improved. To 8.8%, however, in this system, the efficiency of the standard samples made by Xu Qiu casually is above 10%, so he always feels that they are playing acrobatics, so he has no interest in imitating them.

After reading the 9.17% figure several times, Xu Qiu began to calculate:

Today we have to prepare light source samples all day on Friday, test the light source on Saturday, and take a day off on Sunday. The actual experimental results will not be available until Monday.

Although it will take a few days, good things take time. I can bear this bit of loneliness.

However, the positioning of this job seems a bit embarrassing...

On the one hand, under the premise that Xu Qiu's system intends to impact NC, although her system is more efficient, she has no chance to be in NC. Unless she can contribute before Xu Qiu, otherwise the upper limit of the article is AM, JACS , EES and other top journals of materials and chemistry.

On the other hand, most of the work on the second-generation 6 series in her hands has been completed, the characterization is basically complete, and the article is almost written. Once her article on the second generation of molecules is published, the novelty of the third generation of molecules will be greatly discounted.

Scientific research colleagues are not fools, and they can see the similarity between the two molecules at a glance, especially the articles of the same research group.

In other words, it is difficult for a school girl to publish two top journals at the same time for two jobs, but one article at the AM level must be available, and the other article can almost publish a weaker area such as CM and JMCA.

Of course, if Mr. Wei is an academician, none of this will be a problem, and the two AMs are trivial.

After all, the academic circle is also a circle of people, and there are so-called scholars and mountains.

Students refer to people who control and monopolize the educational and academic circles by virtue of power, and can also refer to the exclusive forces formed by people who graduated from a certain school in a specific occupation or organization.

In layman's terms, it means that most of the researchers in a field are occupied by the same faction, for example, they are all in the relationship of brothers and sisters, and the teacher inherits from a family, and other people will be excluded if they want to get a share of the pie.

The severity of the phenomenon of students in China is roughly between the beautiful country and the neon country.

The scientific research atmosphere in the beautiful country is indeed one of the best in the world, and it is also a place where many scientific researchers flock to. Many people run from China and never come back;

As for the neon country, because of the lifelong hereditary system and the relatively small circle of circles, it has created a circle of academics centered on various universities, monopolizing all walks of life in the neon country.

The performance of xuefan in publishing articles is that it is relatively easy to publish some top journals with the corresponding author of the big boss.

However, periodical companies are mainly international companies after all. Your boss is powerful, and occasionally you can produce a few top journals.

As for crowding out outsiders, it is also difficult to prevent them from publishing articles. If a job is really good and high enough, you can’t stop it if you want to stop it. The editors of journal companies are not fools. Reviewers from abroad and outside the circle are enough.

The main benefit brought by scholarship is still in the aspect of scientific research application funding. If there are people behind it, it will be much smoother and it will be easier to get good projects.

In addition, there is promotion. If you follow the right person, you can hang around casually. Even if there is no result, it is not difficult for the lecturer to become an associate professor;

Or if the professor wants to comment on hats such as Jieqing and Yangtze River, the network is somewhat useful, but to this extent, the network is more of a icing on the cake, and what is more important is personal ability. If officials want to make progress, they mainly have to rely on their own solid political achievements.

...

Xu Qiu and Han Jiaying met for morning exercise and breakfast, and then they came to the laboratory to prepare light source samples together.

The number of samples this time is relatively large. The organic trio made a total of nearly 100 samples, and it took a whole day to finish. Among them, the number of students is the largest, with 14 systems and 42 samples. Secondly, there are 8 systems and 24 samples, but Xu Qiu's is the least, with only 7 systems and 21 samples.

On Saturday, the three went to the light source, and it took a full twelve hours and twenty minutes to test all the samples. For the first time, they used up all twelve hours and ate an extra 20 minutes for the next group. minute.

Fortunately, it was a daytime test, and the three of them took turns. Although a little tired, it was still acceptable. If the test was done overnight, I would have to rest for more than ten hours before recovering from the test.

During the testing process, Xu Qiu's samples were arranged as the first priority for testing, and he had already processed the GIWAXS data by the way.

The results are consistent with the previously guessed results, and the crystallinity of 3D-PDI molecules is not strong in the blended films.

Xu Qiu put the test results into the main text, and filled in the text description according to the previously reserved template.

On Sunday, Mr. Feng Shengdong returned the TAS test results of Xu Qiu’s samples, and added three paragraphs of description; at the same time, TRPL also re-tested. Due to the different test equipment, the new results were slightly different from Xu Qiu’s previous test results. However, the main conclusions are basically the same, and Mr. Feng Shengdong added an additional half paragraph of description.

Qiu Xu integrated the results of TRPL and TAS into his own article and obtained the final draft version of the NC article.

What a fulfilling weekend!