I Have a Research Support System

After the meeting, everyone left in an orderly manner.

Wu Feifei took Sun Wo and the others to clean up the venue, wipe the tables, move the chairs, collect the trash... and restore the meeting room to its original state.

Xu Qiu was busy with some enthusiastic students, because the questioning session after his report in the morning was only 15 minutes short, so many people didn't have a chance to ask questions, so they could only "squat Xu Qiu" after the meeting .

Among them, some specific questions were raised about the field of organic photovoltaics, and Xu Qiu answered them directly.

There are also some who come to ask for copies of articles in "Natural·Energy" and "Joule", and there are quite a few people who have such needs.

So, Wei Xingsi went to his office and printed out several documents, and distributed one to everyone.

In addition, Xu Qiu also sent out WeChat messages a few times, but those who asked for his WeChat messages were all boys without exception.

It wasn't because of Han Jiaying's presence, but because of the scholars who came to the venue, except for the girls in the research group, there were very few wild girls.

Xu Qiu speculates that there is a high probability that all the participating teachers are men except Ma Weiwei, and if male tutors take female students on business trips, it will have a bad influence, so they always bring male students out.

However, although domestic teacher-student relationships are taboo, they are not strictly controlled. In foreign countries, teacher-student relationships are widely regarded as immoral and even illegal.

For example, when going to high school/university in the beautiful country, many school teachers are clearly required not to give students their own personal contact information.

Moreover, the school rules will also expressly prohibit teachers and students from falling in love. If this rule is violated, professors who have obtained tenure may lose their tenure.

Therefore, when students of the opposite sex come to the professor's office to ask questions, the professor usually answers the question with the door open or half closed, for fear that such things will affect his reputation and future.

Speaking of which, when Xu Qiu went to the MRS conference in Phoenix, the beautiful country, he also brought Wu Feifei and Han Jiaying with him. However, since he was a student, there was nothing wrong with him.

In the evening, Wei Xingsi arranged a dinner and invited the teachers who hadn't left yet. The location was chosen in the business district around the school, and it took less than a quarter of an hour to walk there.

I don’t know if Wei Xingsi considered the tastes of people from all over the country, or he was controlling his own diet. This time he did not choose the Sichuan cuisine restaurant he once loved, but chose a Jiangsu and Zhejiang cuisine restaurant called "Wangjianglou". Relatively light.

After Xu Qiu dealt with the "curious babies" in the venue, he took a break for a while, and followed the large team of the research team to the restaurant.

On the way, Mo Wenlin suddenly waved to Xu Qiu and said, "Xu Qiu, look at the class group, everyone is talking about you."

"That's right." Xu Qiu responded casually, then opened WeChat on his mobile phone, and found that the number of messages in several class groups was 99+.

Xu Qiu looked at the road from the corner of his eye while flipping through the news.

It was Tao Yan who first posted a photo taken at the venue, which was exactly what Xu Qiu was talking about when he was working on "Nature·Energy".

Tao Yan also accompanied the caption: "Congratulations to Xu Xueba for mentioning an article in the "Nature" journal."

Below are rows of replies from the students, some of whom wrote: "Congratulations to Xu Qiu, worship the boss".

For those who are more cold, just send one word: "film".

Some are lazy, just copy other people's text or send: "+1", "+2", "+10086".

There is also Doutu, who posted some animations of pandaren kneeling and taking pictures of the floor.

After a while, Tao Yan recounted "Mu Xue's question and Xu Qiu's answer" vividly in the group chat, and recounted it with embellishment: "Xu Qiu suggested that Mu Xue fall into his arms..."

Soon, Mu Xue himself came out to refute the rumors, but even so, it aroused the attention of the melon-eating students, who expressed their shock, the chatter was very hot, and the emoticons were flying all over the screen.

Someone said: "I was also at the scene, the situation is basically true, and I have already submitted today's incident to the Onion Club on campus."

Someone else said: "Boss, is there still a pendant missing? I think your suggestion is good, can you give me a chance [serious face]."

Seeing his classmates praising him so much, Xu Qiu didn't know how to respond, but pretending not to see it, and choosing to turn a blind eye would not be good.

After a little thought, Xu Qiu chose to distribute a total of several hundred yuan in red envelopes in several groups, saying: "Thank you for your love."

Since language cannot express, then change to a more direct way of expression.

Moreover, it doesn't cost much to send a few red envelopes, but it can leave a good impression on others. These students are future contacts, and there is no guarantee that there will be any cooperation in the future.

Although Xu Qiu has made great achievements in the field of organic photovoltaics, if he changes careers in the future, he will have to start anew. At this time, if friends from all walks of life can help, he can save a lot of effort.

The dinner at night was relatively simple, because many people had to catch the high-speed train back after dinner, so everyone didn't drink too much wine, and mainly had a light meal.

After the meeting ended, Xu Qiu didn't return to the material one, but directly returned to the dormitory. It was quite tiring to have a whole day's meeting today.

The main reason is that he needs a high degree of concentration throughout the whole process to record some points of view during other people's speeches, or the inspiration that can be used.

If it is paddling, it is relatively relaxing to listen to the conference.

During the meeting, Xu Qiu saw Sun Wo sitting in the back row, his eyes squinted, and he didn't know if he was closing his eyes and resting his mind, or had fallen asleep.

In the dormitory, roommate Sun Yifan is broadcasting live.

"I came back so early today..." Sun Yifan was a little surprised, because Xu Qiu usually didn't go back to the dormitory before ten o'clock, but he didn't continue to ask, but turned off the microphone of the live broadcast, while operating In the game interface, he said with a smile:

"By the way, you are famous in the class today, and the part where you replied to Mu Xue is a classic."

"At that time, I just said it casually, but I didn't expect it to be spread out with embellishments," Xu Qiu complained with a little helplessness: "Sure enough, where Tao Yan is, there is no way to hide gossip."

Xu Qiu glanced at Sun Yifan's computer screen, and now the popularity of Sun Yifan's live broadcast room has slowly accumulated.

At present, the number of people watching the live broadcast in real time has reached more than 400 people.

However, as far as Xu Qiu knows, there are more prostitutes in the game live broadcast area.

More than 400 viewers, it is estimated that less than 10% are actually willing to pay.

After all, you can play games yourself, watching others play games is just for fun, and prostitution is over.

There is no way to use the airplane rocket to get the photo album or avi fragrance of the young lady in ragged clothes.

Of course, game anchors are very important to the platform because they can attract a large number of users.

Free users are also users. In the initial stage of platform establishment, the main consideration is the number of users.

Increase the number first, and then consider improving the conversion rate of paying users in the future.

That is to raise the leeks to make them plump first, and then harvest them vigorously.

Anyway, as long as users are in the venue, they have the opportunity to consume.

Maybe one day the anchor yelled "Old Iron 666" and "Brother, I want it" at him, and then his forehead got hot and he made an impulsive purchase.

Similar to a casino, the interior decoration is usually very well designed, and the service is very thoughtful, and even provides free meals, and the airport bus is responsible for picking up passengers.

It is to attract people to come in. As long as enough people come in, the casino owner can earn back these extra expenses.

It is also somewhat similar to the ecology of the current krypton gold mobile game. The game itself is free, but there are in-app purchases.

It is to expand the user base, even if only a small number of them are willing to pay, it is enough to support their own company.

Moreover, the number of free users is large enough to ensure the game experience of krypton gold players.

After all, free players are part of the paying player experience.

Xu Qiu casually asked, "How is the live broadcast going?"

Sun Yifan responded: "It's okay, if you can stabilize the current fans, you can sign a higher-level contract next time."

Xu Qiu asked: "How about the monthly salary, is it over ten thousand?"

Sun Yifan shook his head, "It's not so easy with a monthly salary of more than 10,000. I'm just a small anchor, maybe a few thousand a month... Appearance, dance anchors, they come in faster, but they mainly rely on gift sharing, and the basic salary is also low. not tall."

Xu Qiu nodded: "Indeed, let's do it as a side job first."

In fact, Xu Qiu calculated carefully, Sun Yifan live broadcasted for three hours a day, and worked overtime for seven or eight hours on weekends, which is not a low workload.

Just like the normal 955, it is said to work 8*5=40 hours a week, but meals, rest, paid toilets, and occasional paddling are also counted in these eight hours, and the actual working hours may only be 6*5=30 Hour.

Rounding it up, Sun Yifan was equivalent to having another full job.

However, the salary benefits brought about barely reached the passing line.

The main reason is that there is no big threshold for live broadcasting, and the more jobs without thresholds, the higher the roll. The end result is that most people's salaries will be suppressed.

Even if the cake in this industry is very big, it is still the top "roll king" who takes the big head, and everyone else shares the leftovers.

With the popularization of the Internet, the current information gap is gradually disappearing and weakening.

A blue ocean industry, if there is no threshold and everyone can enter, within a few years, a large number of people will flood into it instantly, fighting each other, and dye the entire sea red.

Even a field with a relatively high barrier to entry, such as the scientific research circle, is now almost rolled into a ball.

In industries without thresholds, the speed of curling will only be faster.

Xu Qiu went to take a hot bath, then returned to the room, and went to the simulation laboratory to check the results of the recent exploration.

There is no progress in the exploration work on the Y series receptors.

However, major breakthroughs have been made in the exploration of stacked devices.

According to the previous idea, Xu Qiu applied the 1D/2A ternary system to the bottom cell of the laminated device, and precisely regulated the bottom cell by adjusting the ratio of non-fullerene acceptors and fullerene acceptor PCBM in the ternary system. The current density of the battery and the top battery is obtained, and a stacked device with a more suitable current density is obtained.

In the end, the highest efficiency of the stacked device was increased from 14.3% to 15.07%.

15%, is a recognized threshold in the field of organic photovoltaics, and has now been successfully crossed!

Not only that, but there is room for further improvement. For example, the ternary strategy can be extended to other stacked device systems.

Therefore, Xu Qiu redistributed the "computing power" of the senior simulation experimenters, 80% of the "computing power" was used for stacked devices, and 20% of the "computing power" was used to continue to develop the Y series of receptor materials.

On Wednesday morning, the research group held a supplementary group meeting.

Wu Feifei and Sun Wo's perovskite team first reported.

They are still responsible for two previous works, semi-transparent devices based on two-dimensional perovskite materials, and stacked devices.

Among them, the processing technology of the translucent device has been further improved, and the device efficiency has been optimized to 8%, while the average visible light transmittance can also be maintained at 30%.

After nearly a month of optimization, the efficiency can only increase by 0.5% or 0.5%, indicating that there is not much room for further improvement of this system.

Therefore, Wei Xingsi decided to "sell" this job, intending to apply for JMCA first, and then transfer to ACSAMI if rejected.

In terms of stacked devices, the problem encountered before is that the prepared stacked devices do not work directly, and the efficiency is 0%.

Now, a breakthrough of zero has finally been achieved, and the device efficiency has reached 8%.

The specific solution is to use solvent annealing treatment for a period of time after spin-coating the perovskite effective layer, and then proceed to the next operation. Wu Feifei speculates that this solvent annealing process can play a role of "setting". Function, so that the effective layer will not be damaged in the process of post-processing.

Although it is almost 11%+11%=8%, it can be regarded as a start. As long as the device can work normally, the subsequent optimization direction is relatively clear.

Duan Yun is still the same, relatively free.

Warwick has already sent him a formal offer, which is valid for one month.

In addition, he also received an offer from a local start-up company in Shanghai.

The company's main business is the production of 3D printing machines. A small factory like this does not set such restrictions as the validity period, saying that as long as people can come, they are welcome at any time.

Before, Duan Yun was troubled by no offers, but now there are too many offers, and he doesn’t know how to choose.

For Ph.D freshmen, the choice of the first job is very important, which is related to their future career development.

After all, at this age, I have almost 0 work experience other than scientific research. If I don’t get enough experience and training in the first job, it will be very difficult to change jobs and careers later.

Tian Qing still maintains a slow pace, writing an article on "Research on the charge transport mechanism of non-fullerene systems with linear changes in three HOMO energy level differences", the current progress is 25%, and the target journal is ACSAMI.

Chen Wanqing is responsible for debugging the "first-generation thin film printing instrument" bought from Blue River Company. Now the instrument is placed in the fume hood of Jiangwan Laboratory. handover.

Xu Qiu was mainly busy with conference-related matters last week, and almost did no experiments. Only he knew the result of the stacked device efficiency exceeding 15% in the simulation laboratory, and it was difficult to tell it at the group meeting.

Therefore, Xu Qiu decided to share the content he summarized at the conference with others.

These contents are of little significance to him, but they are still very useful to researchers who are just getting started, such as Mo Wenlin and Wu Shengnan.

Although they have published a lot of articles in the past six months, they are relatively "biased", because Xu Qiu only let them focus on the research of a certain sub-field, and they have relatively little understanding of other sub-fields.

Now it is just right to use this opportunity to let them improve their abilities in other aspects as well.

There is always enough knowledge, even if you don't need it temporarily, you may need it when you write articles or do experiments in the future.

Han Jiaying started to write an article on H5 donor materials, the target journal is JMCA, and the current progress is 30%.

At the same time, Xuemei also carried out relevant characterization of PTQ1 materials, and the data integrity is now about 70%.

The main lack of light source data, as well as the NMR data sent to the samples have not been returned.

For NMR, just wait patiently. For light sources, there is another test opportunity at the end of the month.

Xu Qiu didn't plan to go to the light source test this time, because now basically all the members of the research group are skilled light source testers, and it doesn't matter if he goes or not.

In addition, whether it is H5 or PTQ1, Wei Xingsi has no intention of sending samples to NIM for third-party testing.

On the one hand, the word-of-mouth in Wei Xingsi's group has already spread, even if no third-party testing is done, other researchers will not question the results.

After all, it is the current world record holder in the field of organic photovoltaics, and has achieved 13.5%, so it is not possible to falsify the 11% and 12% efficiency systems.

Moreover, the efficiency of 11% and 12% at this stage is already a relatively normal level, and many other research groups have repeated this result.

On the other hand, it's mostly about saving money.

It is understandable that the third-party testing needs to be charged, but the fee is so expensive, if each system is tested once, it is really unbearable.

Moreover, it is also troublesome to have someone go to deliver the samples in person.

This week's conference has nothing to do with Wu Shengnan, so her work continues to proceed in an orderly manner.

Mainly to continue to polish the application for the Outstanding Youth Fund, and by the way tutor two undergraduates to conduct experiments such as synthesis, characterization and device testing of FOIC materials.

Wei Xingsi planned to write out the first versions of the two project applications before the end of the year, so that when he came back from the winter vacation, he could directly submit them after a little modification.

Because of the conference, Mo Wenlin only made three batches of devices, but the performance is not bad.

First of all, it is based on the J2:PCE10:IEICO-4F system, with an efficiency of 12%+. It has already begun to organize articles, and plans to submit an AM sub-journal AFM.

Now, with more and more researchers pouring into the non-fullerene field, many people are focusing on the ternary system, which leads to more and more people working on the ternary system, and it is difficult to do the same as the beginning Easy to send AM.

Secondly, Mo Wenlin adopted the method of "introducing a ternary system" proposed by Xu Qiu before, and optimized the efficiency of the stacked device to 14.3%.

Hearing this result, Wei Xingsi's eyes lit up.

Although we usually use 1% as a gradient to look forward, but the efficiency has really reached the level of 14%, and it is very good to be able to increase by 0.2% or 0.3%. It is very good to expect such a big leap of 1% at one time. All the difficulties need to be worn down little by little.

Wei Xingsi turned his head and asked, "Xu Qiu, what do you think?"

Xu Qiu thought in his heart, what else can I think, I have reached 15% here, but he said:

"I think there is still a lot of room for optimization of stacked devices based on the ternary system. For example, we can start from... these aspects. This week I plan to prepare a few batches of devices by myself."

"Okay," Wei Xingsi nodded, "It just so happens that all your articles have been rejected, so let's do an experiment, it's a change of taste."

The group will end, and in the next few days, the days will return to normal.

Xu Qiu let the simulation experiment system continue to explore the processing technology, and at the same time, he personally went to the field to prepare the stacked device.

He tried to reproduce the 15% efficiency in the system in reality.

The preparation of stacked devices is more troublesome than the preparation of ordinary devices, because there are double effective layers and transmission layers, so the time cost will increase by about 50%.

Only one batch can be produced in a day, and it is a little bit reluctant to make a second batch of devices.

On Wednesday, Friday, and Saturday, Xu Qiu prepared a total of three batches of devices.

The first batch of devices, perhaps because Xu Qiu hadn't done device fabrication experiments for a long time, was a bit raw, and the highest efficiency was only 13.67%, which was not as high as that of Mo Wenlin.

In the second batch of devices, he surpassed the previous record set by Mo Wenlin, and the highest efficiency reached 14.52%.

In the third batch of devices, Xu Qiu directly increased the efficiency to 15.00%.

The measured data this time happened to be an integer, and it was the first time Xu Qiu met it, which was quite a coincidence.

However, from the perspective of probability, when two decimal places are kept, the probability of the measured result being an integer is roughly 1%. He has made so many batches of devices, and it is normal to encounter them once.

At the same time, the efficiency of the laminated system in the simulation laboratory has also been further improved, reaching 15.37%.

This also made Xu Qiu feel that it was a very correct choice for him to choose stacked devices as a breakthrough.

Because stacked devices mainly involve process optimization, the simulation experiment system has great advantages in this respect.

The development of Y-series receptors mainly involves the synthesis of new materials, and relatively more emphasis is placed on the design of molecular structures.

In other words, luck or technology is relatively important. As long as the molecular structure is wrong, no matter how you optimize the process, it will be futile.

The current data of 15% stacked device efficiency has finally stepped on a threshold in the field of organic photovoltaics, which also means that this work has reached the threshold of publishing CNS articles.

Of course, if you want to publish CNS, 15% alone is not very stable, after all, you want to compete across fields and other popular fields.

If it can be done higher, such as 16%, the probability of successfully impacting the CNS will be higher.

Moreover, whether you can get on CNS is a matter of luck, and the attitude of the editor and the degree of approval of the reviewers are all uncertain factors.

Even ordinary academic leaders dare not say that a piece of work they have done will definitely be published on CNS, unless it is a Nobel Prize-level scholar, that’s another story.

After all, the number of articles collected by CNS is limited every year, and it is difficult for millions of researchers to compete for thousands of places every year.

But in any case, Xu Qiu has achieved such results at this stage, and a major sub-published of "Nature" is basically gone.

Therefore, Xu Qiu plans to make two-handed preparations. First, he must optimize the performance of stacked devices, and strive to continue to break through, 16%, 17%, and 18%.

But if the current system cannot be broken through for a long time, then submit a paper to "Nature" or "Science" with 15% efficiency.

If the manuscript is rejected or suggested to be transferred to the major sub-journals of "Nature", then it is difficult for the three "Nature" related to the field of organic photovoltaics, "Nature Energy", "Nature Materials", "Nature Optoelectronics" Choose one of the big sub-journals.

In fact, Xu Qiu also thought about whether to use the Y series receptors as a stacked device before.

The idea at the time was that I was reluctant to present the two concepts of lamination and Y-series receptors in the same work, which was a bit wasteful.

Originally, both of them were expected to impact the CNS system. Together, even if they could post a CNS, it would be a loss.

Although there are such considerations, Xu Qiu also tried this idea in the simulation laboratory.

Anyway, let's make the results first, and it's up to me whether to publish them together or not.

The final results show that the current Y series receptors are not suitable for stacked devices, and the highest efficiency is not as good as that of ITIC derivatives represented by IDIC-4F, and even the 15% threshold cannot be passed.

You know, based on the Y series of binary devices, the highest efficiency has reached 14.8%.

However, if it is used in stacked devices, the efficiency cannot exceed 15%, so it does not make much sense.

Xu Qiu tried to analyze the reason.

He thinks it may be because the Y series acceptor is too "perfect". When it is blended with the J4 donor, the effective layer film can achieve excellent light absorption in the range of 300-900 nanometers, which is also the performance of the Y series system. The reason for getting 20 mA per square centimeter.

When such a perfect system is applied to stacked devices, this will happen:

If the Y series is placed on the bottom cell, it will absorb most of the light, and there is basically nothing left for the top cell, resulting in an extreme imbalance in the current density of the two cells, such as the bottom cell 20+, Top battery6.

Because of the series structure, the final current density of the overall battery becomes 6 milliamperes per square centimeter, resulting in a significant drop in device performance.

And if the Y series is placed on the top battery, then it can only eat the remaining light after being absorbed by the bottom battery, and the original good performance will be wasted.

Originally, it could have a current of 20+, but now it may only be 12. It is difficult for the efficiency of the final device to exceed the state when it is not stacked.

In other words, the Y series can be a C by itself, and it can play very well without support. At the same time, because it is too good, there is no support that can cooperate with it.

And letting the Y series play as a support is a bit inferior, and it doesn't necessarily perform better than other professional supports.

It can also be said that a stacked device is actually a combination of two less perfect devices to obtain a more perfect device.

The perfect performance of Y-series materials, placed in stacked devices, has become an imperfection instead.

PS: I don't know if the monthly pass for this month can break through 1000, so I ask for a monthly pass.

PS2: There should be more recent updates.