I Have a Research Support System

On Friday morning, Xu Qiu received an email from Wei Xingsi, and learned that the review comments for the previous "Joule" article, which featured "scratch, colorful, and translucent" as its highlights, had been returned.

The editor sent a total of two reviewers for review, and they all gave very high evaluations.

Reviewer 1: "This work is very inspiring, and it is recommended to accept it directly."

Reviewer 2: "It is recommended to accept it directly, or refer to the following revisions..."

In the end, the opinion given by the editor was "No modification is required, the article will be accepted directly".

In this case, some questions raised by the second reviewer only need to simply write a reply, and there is no need to modify the text.

To be honest, Xu Qiu was a little surprised when he saw this result.

It has been a long time since he received the review comments of "suggested articles to be accepted directly". The comments received before are generally major or minor changes.

Moreover, for this job, Xu Qiu felt that he had "raised his vote":

In the reported system, the device efficiency is not considered top-notch, but it basically uses all the gimmicks that can be used in the field of organic photovoltaics, but the journal it submitted to is a high-end journal such as "Joule".

Therefore, Xu Qiu had already planned to revise the article substantially, and even planned to switch to AM and EES after being rejected.

Now it can be accepted directly without modification, probably because the article is more in line with the acceptance orientation of "Joule".

In addition to pursuing breakthroughs in efficiency, they may also be more concerned about these gimmicks.

In other words, although Xu Qiu's article lacks hard power in terms of efficiency, it tells a good story and has relatively strong soft power.

On the other hand, it may also be because Xu Qiu led the team this year and made a very high contribution to the field of organic photovoltaics.

Wei Xingsi's research group, or Xu Qiu himself has gained academic influence and has become a leader in the field of organic photovoltaics.

The probability of a big boss submitting an article as a draft may be several hundred percent higher than that of an unknown small research group.

However, Xu Qiu was not overjoyed, but rather calm in his heart.

For him now, he has posted a lot of articles, and it feels like that's the same thing. Only CNS can barely cheer him up.

Xu Qiu is no longer the novice scientific researcher who can be excited for a long time when he publishes an article in the second section of SCI.

Just like reading online articles, if you repeat a routine, you will get tired of reading too much, and the same is true if you post too many articles.

The pleasure people get from the same thing will gradually decrease as the number of repetitions increases and the age increases.

This is why, if the couple cannot transform love into family affection in middle age, it is easy to have problems when they are old.

In addition, after this "Joule" article was successfully accepted, all the work in Xu Qiu's hands is now in the state of being published/received.

The main reason is that Xu Qiu has been trying to attack the CNS during this period of time, and he didn't go to the small article.

Shocking the CNS does drag the rhythm.

Under the covers, Xu Qiu wrote a reply letter to Teacher Wei, congratulating each other on mentioning an article in "Joule". Afterwards, he took a look at the simulation laboratory.

It was found that the efficiency of stacked devices has finally made a breakthrough.

Now the simulation laboratory is mainly exploring two laminated systems:

One is based on the system of ternary J4:PCBM:IDIC-M bottom battery and binary PCE10:IEICO-4F top battery, referred to as ternary IDIC-M/binary IEICO-4F;

The other is based on the system of ternary J4:PCBM:IDIC-M bottom battery and binary PCE10:COi8DFIC top battery, referred to as ternary IDIC-M/binary COi8DFIC;

Among them, the efficiency of the ternary IDIC-M/binary IEICO-4F system has moved up by 0.07% to 15.98% on the basis of the original 15.91%, but the room for improvement is obviously insufficient.

As for the other ternary IDIC-M/binary COi8DFIC system, after these days of exploration, the performance of the device has risen like a rocket.

The current efficiency has officially broken through the 16% mark——

Reached 16.22%!

The difference in the performance of the two systems mainly comes from the short-circuit current density.

The short-circuit current density of the ternary IDIC-M/binary COi8DFIC system can reach 14.32 mA per square centimeter, which is about 2.4 higher than the 13.98 mA per square centimeter of the ternary IDIC-M/binary IEICO-4F system. %.

However, the changes in the open circuit voltage and fill factor between the two are not large.

In the end, this difference is reflected in the photoelectric conversion efficiency of the device, which is changed from the latter's 15.91% to the former's 16.22%, which is just an increase of about 2% (relative value), which is comparable to the increase in short-circuit current density.

Although the improvement of 2% seems small, but in the final stage of efficiency sprint, every little bit of optimization is very critical.

After getting the data, Xu Qiu began to explore the reasons behind this experimental phenomenon, to see if he could find a reasonable explanation and room for further optimization.

On the one hand, Xu Qiu believes that the change in the short-circuit current density of the two laminated systems can be attributed to the difference in the original binary single-junction system.

Although the band gaps of COi8DFIC and IEICO-4F are similar, the microscopic morphology of the formed active layer film will also affect the short-circuit current density when the device is actually fabricated.

This leads to a higher short-circuit current density of the PCE10:COi8DFIC system than that of PCE10:IEICO-4F in the binary single-junction system. The former can reach about 26 mA per square centimeter, while the latter is only 23-24 mA Ann per square centimeter.

Now they are used in the top cells in stacked devices, and there is a high probability that they will also "inherit" part of their characteristics in the binary single-junction system.

On the other hand, another article by Li Dan's research group based on the COi8DFIC ternary system gave Xu Qiu ideas for further optimization.

The introduction of PCBM into stacked devices is not to improve the device efficiency of the corresponding sub-cells, but to facilitate the regulation of the light absorption performance of each sub-cell of the stacked device, so that the short-circuit current density of the top cell and the bottom cell match.

In other words, it is not very important whether the PCBM is placed in the bottom cell or in the top cell.

Now, the optimal lamination system is the ternary IDIC-M/binary COi8DFIC system.

According to the results reported by Li Dan's research group, the device efficiency of the COi8DFIC-based ternary system is higher than that of the COi8DFIC binary system.

The experimental results in our own group show that the performance of the ternary IDIC-M system is not significantly different from that of the binary IDIC-M system.

Therefore, Xu Qiu came up with the idea of ​​transferring the PCBM in the bottom cell to the top cell, that is, building a binary IDIC-M/ternary COi8DFIC system.

Anyway, the IDIC-M system can still operate without PCBM, and if the COi8DFIC system is added to PCBM, it may be able to "go to a higher level".

This might be a feasible solution.

Of course, because reality is often a chaotic model, there are many variables.

Theoretically feasible ideas, whether they actually work or not still need to be tested by practice.

Therefore, Xu Qiu threw this experimental idea to the simulation laboratory, and let the simulation experimenters explore it for him.

It is past eight o'clock in the morning, and Xu Qiu is still under the covers.

Because the days have come to the end of December, officially entered the winter.

The winter in Shanghai is still relatively cold, wet and cold, and the air conditioner is not turned on in the dormitory to save electricity. Waking up is indeed a very courageous thing.

In fact, with Xu Qiu's current financial strength, "air-conditioning freedom" can still be realized.

But Xu Qiu was used to being poor when he was a child, and it was really difficult to develop the habit of spending money lavishly when he grew up. He always saved what he could, including the bonuses he got from Wei Xingsi. He saved it.

Of course, objectively, people engaged in scientific research have no place to spend money.

The whole day is the laboratory, the cafeteria, the dormitory, three points and one line, and there is not much time for oneself, so there is no way to spend it.

The only place to spend may be to equip yourself with a good laptop and mobile phone, but these two items add up to a few thousand to ten to twenty thousand at most, and you can use them for several years after you buy them.

Or just read novels and play games, but as long as you don't spend a lot of money, you won't spend a lot of money.

Xu Qiu struggled to get up, wash up, then exercised early with his school girl, had breakfast, and finally went to Caiyi together.

At the gate of 216, Xu Qiu saw Fan Wentang, a prospective doctoral student who had come for an interview.

After Fan Wentang saw Xu Qiu and the two, he took the initiative to say hello, "Senior brother Xu Qiu, I'm a bit early, and you haven't gone to work yet?"

"Yes," Xu Qiu nodded, and responded, "We usually start at 9:30 in the morning, and we don't come too early because..."

Xu Qiu thought for a moment, and did not choose to help Wei Xingsi conceal the real working hours in the group: "Because graduate students usually stay until ten o'clock at night, or even after ten o'clock."

He believes that what he thinks should be what he thinks is what he thinks. Everyone should clearly mark the price, what is the intensity of the work, and what is expected to be paid in return. Don’t say that you tricked people in first, and then told the other party, sorry, we implement flexible work. system, it needs to be frequently played to 996.

Of course, Xu Qiu's thinking belongs to students. From the perspective of a tutor, the benefits of deceiving people to come in are obviously higher.

Although there is an old saying that "don't do to others what you don't want to be done to you", but after becoming a student and becoming a teacher, it is still relatively difficult to not forget the original intention.

Fan Wentang didn't have any special reaction: "Our original research group was similar. We arrived at seven in the morning and worked until five in the afternoon, but we often worked overtime until eight or nine at night."

Xu Qiu gave a "hmm", then pointed at Fan Wentang with his hand, turned his head and introduced to the school girl: "This is Fan Wentang, a prospective doctoral student who planned to come here to study for a Ph. Dongfa University."

"Then why did he call you senior brother?" Han Jiaying asked puzzled.

"This..." Xu Qiu took the opportunity to explain: "Fan Wentang, our research group does not have such a deep hierarchy, and everyone can usually call him by his first name, and I just graduated from a bachelor's degree this year, so there is no need to call me brother Yes... this is Han Jiaying, a senior this year, who has already enrolled in graduate school, and will come to us to study for a master's degree in the future."

"No wonder I look at you so young, you just graduated from college." Fan Wentang said with emotion.

Afterwards, Fan Wentang looked at Xu Qiu and Han Jiaying thoughtfully, and realized that there seemed to be some special relationship between them, but he didn't ask, but praised: "You are really amazing, Han Jiaying's name When I read the research group’s articles before, I also had the impression that there are quite a lot of academic achievements, but I didn’t expect to be an undergraduate student. The students of Shanghai Comprehensive University are so strong..."

"Of course it's not universally powerful. The main reason is that Xu Qiu is relatively strong. This is the golden thigh in our research group..." Mo Wenlin appeared in front of the three of them at some point, and took the bait: "I am Mo Wenlin, a Ph.D. Grade, Kainan University came here for joint training, are you a new doctoral student, I seem to have heard Xu Qiu say it before."

"I'm not a doctoral student yet, and I haven't graduated with a master's degree yet." Fan Wentang scratched his head, "I've dealt with the school's affairs today, so I came here to take a look, but I didn't expect to come here early."

"Let's come in first, don't stick to the door." While speaking, Xu Qiu opened the door with his card and led everyone into 216.

Afterwards, Xu Qiu arranged Fan Wentang to sit in Wu Shengnan's seat.

Because post-doctorate senior sisters usually stay in Jiangwan now, the position on Handan's side is vacant.

Now that the number of people in the group is increasing day by day, it should indeed be divided into two groups, otherwise it would be difficult to think about 14 people in a small office.

After everyone sat down, Fan Wentang said to Xu Qiu: "I called Teacher Wei before, and he said that he is busy today, so I can report to you directly after I come over."

"Well, yes, then you can follow Han..." Xu Qiu originally planned to hand over Fan Wentang to the school girl, but when he saw Chen Wanqing who pushed the door in, he changed his mind: "The lord is here, Chen Wanqing Senior sister, this is your successor, Fan Wentang, you can hand over your work or something. By the way, why didn't you go to Lanhe today?"

Chen Wanqing looked Fan Wentang up and down, and explained casually: "I went to the Blue River for four consecutive days in the past few days, and I plan to take a day off today. It's good to be a student. You can rest if you want to rest..."

After speaking, the senior sister's voice became smaller and smaller. She seemed to recall the fear of being dominated by Wei Xingsi, and finally sighed softly: "Hey, studying for a Ph. D. and working seem to be the same thing."

After Fan Wentang was arranged, Xu Qiu began to plan today's experiment.

While breakthroughs have been made in simulation labs, they always have to be replicated in reality.

Mo Wenlin still has an exam this afternoon, she can't be counted on, Xu Qiu plans to do it herself.

Just as he got up to go to the inner laboratory, he was stopped by Han Jiaying who was sitting next to him: "Brother, are you going to do the experiment?"

Xu Qiu looked at the junior girl: "Huh?"

Han Jiaying smiled and said, "If you have any challenging experiments, please feel free to arrange them for me."

Xu Qiu stroked his non-existent beard, thought for a moment, and said, "Are you hurt by writing?"

Han Jiaying nodded like a chicken pecking at rice: "Yes, yes, I have been writing articles for almost a month, and I can't write anymore."

"..." Xu Qiu thought for a while and said, "Alright then, you can make today's laminated device."

Just before, I arranged a fourth work for the junior in the "Science" article, and now let her make the optimal stacked device. With this contribution, it is definitely enough to get a fourth work.

This is also the advantage of a small research group, there are not so many twists and turns in the ranking of authors.

If it is multi-party cooperation, there are three, four, or even five or six working units, and the ranking of authors may need to be determined through multilateral negotiations.

Although the preparation of stacked devices has never been done before, in principle, stacking is similar to ordinary single-junction devices, which cannot be separated from spin coating and evaporation, but the process is slightly more complicated.

Therefore, for Han Jiaying, it was not too difficult.

Xu Qiu changed the optimal sets of conditions in the simulation laboratory and told the junior to let her play freely within a certain range.

Although the optimal conditions are known, they cannot be given directly, which would be too fake.

After settling down the junior girl, Xu Qiu returned to the office and said with emotion in his heart: "It's so rare that I want to do experiments by myself, but I didn't expect to be robbed by the junior girl."

Then, Xu Qiu continued to revise the "Science" article.

Before, he just wrote out the first draft, and what he got was not the final version.

In some details, we still need to continue to refine, try to let others see this work, so that we can have more inspiration.

Instead of letting others read it, they just feel: "They have achieved so much efficiency, wow, great NB!" Then there is no other gain.

Therefore, in addition to highlighting the high efficiency of the device, the semi-empirical analysis in the article is also a more important point.

Although the part of semi-empirical analysis is a story added later, for applied science such as materials, theory always lags behind practice.

Therefore, there is no need to be too entangled in who comes first, as long as it is easy to use.

Here, Xu Qiu talked about the specific material selection rules, that is, how to select and design materials without the factors of device processing technology.

Another point is the problem of PCBM. Before Xu Qiu only regarded it as a means of auxiliary regulation of light absorption, and now it can be added to the possible impact on device performance.

However, limited by the length of the 2500-word article, Xu Qiu added some content, so he had to transfer some of the less important content to the supporting information.

This process is still quite painful. The words I coded out are like my own children, and I am not willing to lose any of them.

Time flew by, and it was past five o'clock in the afternoon.

Xu Qiu corrected the article for a whole day, and his back hurts a little. I have to say that correcting the article is more tiring than playing games with school girls.

In the laboratory, Han Jiaying has just completed the evaporation of the device and is shutting down the molecular pump.

The production cycle of stacked devices is relatively long. If it is an ordinary single-junction device, if the device is made in the morning, it is estimated that the evaporation and testing have been completed by now.

Looking at the current situation, it is definitely impossible to complete the testing of this batch of stacked devices before 5:30.

Therefore, Xu Qiu and Han Jiaying discussed it and decided to go out to have dinner together first, and then go back to the laboratory for device testing.

Anyway, if the device is stored in a vacuum atmosphere for a short period of time, there is a high probability that it will not go bad.

Speaking of which, tomorrow is Saturday, which happens to be New Year's Day, and the two of them even bought New Year's Eve movie tickets at midnight.

I just finished eating, came back to do a wave of experiments, and watched New Year's Eve movies together. The days are very fulfilling.

As the place for dinner, Han Jiaying chose a newly opened Sichuan restaurant called "Happy Delivery" on Daxue Road.

The reason why I didn't go to the Wujiaochang shopping district is because today's New Year's Eve is superimposed on Friday, and there must be a lot of people there.

As a result, when Xu Qiu and Han Jiaying arrived at "Happy Delivery", they found that there were quite a few people here.

However, when they came, the two took a number and found that there were more than 40 tables ahead.

What follows is a long wait...

After waiting for nearly an hour and a half, the two of them entered the restaurant under the leadership of the waiter until after seven o'clock in the evening.

The taste of the dishes here is not bad, of course, it may also have something to do with Sichuan cuisine itself.

Because of the presence of seasonings such as chili and pepper, the threshold for Sichuan cuisine to be delicious is slightly lower than other cuisines.

Anyway, it’s just a no-brainer to put chili peppers. It’s so spicy that you can’t tell the original taste of the ingredients at all.

This may also be the reason why Sichuan cuisine can be popular all over the country, and even spread abroad. Chili is a good thing.

Originally, Han Jiaying had never had much experience with Sichuan cuisine before, but now being brought by Xu Qiu, she has also fallen into the embrace of Sichuan cuisine.

At about 8:30 in the evening, Xu Qiu and Han Jiaying returned to Caiyi after eating and drinking.

At this point in time, except for the uncle in the concierge who was still watching TV with the lights on, the lights in other rooms were basically dark, and 216 and 218 were no exception. It seemed that everyone had gone to celebrate the holiday.

Xu Qiu and Han Jiaying entered 216, put on their lab coats, and started working.

Generally, it is relatively fast to test the J-V characteristic curve of the device alone.

Because there is no need to install a sample holder, it can be tested directly in the glove box, so it takes about three to five minutes to complete a test and get more than ten data points.

A batch of 12 standard devices takes half an hour to an hour.

But if the performance of the device is good, it is more troublesome to measure the J-V curve together with the external quantum efficiency EQE.

Because measuring the EQE curve needs to put the device into the sample holder, take it out of the glove box for testing, disassembly, transfer, debugging and testing, it takes five to ten minutes to test a device.

If you test both J-V and EQE, 12 devices, it will take two to three hours to add up.

It's half past eight, so it's not too late.

However, Xu Qiu didn't know whether to pray that the performance of these devices would be better, and a breakthrough in efficiency could be achieved;

I still pray that the performance of this batch of devices will be poorer, so that they don't need to test EQE, so that they can save some energy, so that they can have some extra activities after the New Year's Eve movie.

Han Jiaying didn't know what Xu Qiu was thinking. She reached into the evaporation glove box with both hands, opened the door of the evaporation hatch, took off the laminated device from the sample holder, and picked up a piece at random.

Xu Qiu glanced at the label on the substrate that the school girl was holding, and found that it happened to be the optimal condition in the simulation laboratory. It was a coincidence, and he muttered in his heart:

"In the simulation laboratory, the device efficiency under this condition is 16.22%. In reality, if there is no problem with the device, it should be able to reach a maximum of 15.5%, or 15.6, 15.7, 5.8%?"

"Boom—" The simulated sun light source starts.

"Drip..." The source meter started.

The voltage and current values ​​on the source meter are changing rapidly.

The results of the device performance are displayed on the computer screen.

"16%!" Seeing the result, Han Jiaying put her legs together and said excitedly, "Brother, 16%! 16%!"

Xu Qiu blurted out "Damn it", what's going on?

The efficiency is actually 16.15%, almost catching up with the data in the simulation laboratory, Xu Qiu is a little puzzled.

He first gave the junior a "loving hug" from behind, and then said, "Change another place and try again?"

As a result, after changing a point, the efficiency is still 16.09%, which is very stable.

Continue to change the test location, the efficiency is still 16.07%.

Xu Qiu began to analyze the possible reasons in his mind.

He didn't think it was simply because the school girl was full of energy, and just one experiment fluctuated the efficiency data to near the maximum value.

In terms of experimentation, if something is unusually poor, it can be attributed to bad luck, or failure to do the experiment well.

But if you encounter an exceptionally good situation, it is probably not caused by luck, but by other factors behind it.

PS: Ask for a monthly pass, err, now the monthly pass is 1443 tickets, I look forward to getting up tomorrow morning to see that it is...**** ticket?