I Have a Research Support System

On Tuesday morning, Wei Xingsi went to Pudong Airport to pick up the foreigner, and then put him in the Crowne Plaza Hotel next to the school.

Generally, colleges and universities have higher standards for reimbursement of catering and accommodation expenses for foreign guests than for domestic scholars. For example, if the domestic meal standard is 100 yuan per person per day, foreigners are almost 150-200 per person per day, and domestic accommodation may be 300 yuan. Yuan per day, foreigners are 500 yuan per day.

Like the last time Xu Qiu and Wei Xingsi went to Gong Yuanjiang for a meeting, it was a domestic exchange visit, and they stayed in a hotel, while the foreigner Bazan stayed in a star hotel.

As for the reason, Xu Qiu is not very clear. Anyway, he feels that apart from the disadvantages in politics, the average treatment of crooked nuts in China is basically higher than that of Chinese people.

In the afternoon, Wei Xingsi took Ronald from the hotel to the office, mainly to introduce him to the members of the research group, and took him to visit the laboratory in Handan Campus.

Xu Qiu had seen a photo of Ronald in the literature before, but it was a headshot, with the head taking up 80% of the photo, and it was black and white, and this was the first time he saw a real person.

Ronald came here alone, unlike before Bazan brought a young and beautiful female translator, he is 50+, wearing a shirt and slacks, tall, estimated to be 185+, his complexion is very fair, and his skin is not very Okay, but the complexion is still good, the characteristics of the crooked nuts are very obvious, and it belongs to the kind that can confirm the identity of the other party crooked nuts at a glance.

"Ronald, this is a member of my research group." Wei Xingsi first said something in English, then switched to Chinese and said, "Let's introduce ourselves one by one."

"I'm Xu Qiu, and my main research direction is organic solar cells." Xu Qiu spoke first, gave a brief introduction, and finally added: "Nice to meet you." (Nice to meet you)

Ronald replied with a smile: "You too." (I am the same)

The others also introduced themselves one by one. Wu Feifei, Han Jiaying, and Tian Qing were relatively fluent in English, while Chen Wanqing, Duan Yun, and Mo Wenlin were hard-boiled in English and could not speak fluently. It can still be understood.

After that, Wei Xingsi took Ronald to visit the laboratory, introduced various instruments and equipment, and finally led the foreigner to the machine for testing CELIV and TOF.

Seeing the familiar instrument, Ronald's eyes lit up. After a few glances, he said incessantly: "Oh, this is an old-fashioned CELIV test device, which uses a signal generator and an oscilloscope... Now we have developed There is a new device that can be connected to a computer and export data in real time... If possible, I want to test it now..."

Xu Qiu next to him was amazed, the foreigner just got off the plane, so full of energy, jet lag, so he rushed to do the experiment... If it is in the country, you can’t have a meal first, and then go out for activities at night, um, at least This was the arrangement for the exchange with Gong Yuanjiang last time.

"Some foreign scholars are like this. They really love the scientific research industry." Seeing the surprised looks of others, Wei Xingsi explained in Chinese, and then Hetian Qing said: "You go and prepare a few samples, test them, and let them Ronald helped to see if there was anything wrong with the way we tested and processed the data."

"Okay." Tian Qing took the order, put on her lab coat, and began to prepare samples, while Wei Xingsi took Ronald to his office to rest temporarily.

Speaking of which, when Xu Qiu went to Gong Yuanjiang to attend a meeting, he met Bazan, a beautiful country. Although his English pronunciation has an accent, it is generally easy to understand, while Ronald's English accent is relatively heavy. For the big tongue sound, the "l" sound will be pronounced as "le", and the sound will be dragged.

The most important thing is that Ronald was born in a country where English is his mother tongue. His English is very fluent and he speaks very fast, which makes the words he speaks seem to be surrounded by stereo, and the reverberation is lingering.

Wei Xingsi lived in the beautiful country for many years before, and there was no pressure to communicate. Xu Qiu needed to listen very attentively to understand, while Chen Wanqing, Mo Wenlin and others next to him were always in a dazed look. What foreigners are saying, I can't understand a word.

After the CELIV test, Tian Qing was mainly in charge, and Xu Qiu watched from the side.

The reason for this exchange visit was that an article published by Tian Qing attracted Ronald's attention, but the main reason was that Ronald was more interested in the non-fullerene system he developed and wanted to share a share of the pie.

After testing several standard sample systems, Ronald put forward several opinions. One is that when drawing the picture, the starting point of the current density rise of the CELIV image needs to be manually marked as zero point. The other is that the time scale of the test should be within the RC constant , otherwise there will be a large test error. The third is that individual devices have breakdown and short circuit phenomena. The transmission layer material can be made thicker. Fourth, they have updated the fitting calculation formula of carrier mobility...

In the evening, Wei Xingsi hosted a banquet for foreign guests. The venue was Xiaonanguo next to the Pujiang River, which is where Xu Qiu and Han Jiaying had been before. The research team members went to have a meal together.

On Wednesday afternoon, Wei Xingsi took Xu Qiu, Tian Qing and Ronald out for a stroll.

There are two projects in total, climbing Sheshan and visiting Chenshan Botanical Garden. The location was chosen by Mr. Wei, which is quite healthy...

Xu Qiu complained silently in his heart, the last time he ate "Laosheng" pork belly chicken, yesterday he ate "Xiaonanguo" Shanghai cuisine, this time he went mountain climbing and botanical garden again, could it be that Mr. Wei...

Because of the long distance, Wei Xingsi didn't drive by himself this time, but called a special car, chartered it for a day, and was responsible for the pick-up and drop-off.

On the way, Wei Xingsi and Ronald mainly chatted, "How's the weather in Northern Europe?", "Have you been to China before, and which cities have you been to?" Occasionally, the topic changed to specific experiments, and Tian Qing and Xu Qiu would add a few words .

The driver was very professional. He kept silent and concentrated on driving along the way.

After walking for more than an hour, I finally came to the foot of Sheshan Mountain. This is the National Forest Park. There are gates like the ones with limited traffic in scenic spots, but no tickets are charged, and you can enter directly.

Although Sheshan is a mountain, it is only about 100 meters above sea level, which is almost meaningless. Xu Qiu feels that he has already climbed to the top of the mountain before warming up. Tian Qing also has no pressure. The spirit of the foreigner is also good. Only Wei Xingsi is out of breath. It appears to be a lack of exercise.

After climbing Sheshan, the four of them went to the Chenshan Botanical Garden not far away. There is a fee here, and the ticket price is 60 yuan.

In fact, Xu Qiu was not very interested in such things as zoos, botanical gardens, and museums before. According to his thinking, now that the Internet is so developed, if you want to see anything, you can just check the pictures and you will have it all.

However, being in the Botanical Garden and smelling the fresh air, Xu Qiu felt that his previous thinking was a bit narrow. Looking at photos is really not as good as experiencing it in person. After all, one is a two-dimensional picture and the other is a three-dimensional reality.

The variety of plants here is very rich. There are all kinds of chrysanthemums outdoors, and various cacti, prickly pears, and Phalaenopsis growing in the desert indoors. Well, these are the most recognizable, and most of the other plants are Can't name it...

The reason why he recognized the Phalaenopsis was that when Xu Qiu and his junior chatted before, he learned that she was allergic to this flower, so he took a quick look at the picture.

There are very few young people who come here to visit, and most of them are old men who bring their own or other old ladies.

Before, Xu Qiu noticed that there is also an annual card here. I guess these old men and women have applied for an annual card, and then come here twice a day for a stroll, just like visiting a park.

This made Xu Qiu feel that maybe this is his life after old age?

On Thursday, at nine o'clock in the morning, the exchange meeting officially started.

There was not much movement in Ronald’s exchange visit this time. After all, his field is relatively small, basically only intersecting with researchers in the field of organic and perovskite.

However, after posting the posters, some passers-by from other research groups came to listen in. Naturally, all eight members of the research group were present to act as facades.

Ronald is from Abo Akademi University, Finland, Department of Physics, Department of Natural Sciences and Center for Functional Materials.

This exchange visit is not mainly to introduce his work, but to make a summary report on the mechanism research in the field of organic photovoltaics, which is also requested by Wei Xingsi.

Ronald was eloquent on stage: "Transition transport...deep trap state...Gaussian disorder model...Gaussian density of states distribution...space-confined charge...Fermi level pinning phenomenon...interfacial recombination..."

The report lasted nearly an hour and was very professional.

This is also the first time Xu Qiu listened to a report from a pure theoretical researcher, which gave him the feeling of taking the "Mathematical Analysis" course...

If you lose your mind a little bit, you don't know where the teacher is talking.

Xu Qiu has some foundations. He has had a lot of exchanges with Feng Shengdong and Tang Yunkun before, and has read some documents. Therefore, although some of them sound a bit difficult, he can basically understand them and gain some gains. for example:

"Low charge mobility is a major factor limiting the efficiency improvement in the field of organic photovoltaics."

"The traditional CELIV and SCLC methods for testing charge mobility, because the test is a device, the order of magnitude of the mobility is basically the same, mainly because it is affected by interface recombination. If you want to compare the charge transport performance of different materials, the method of preparing field effect transistors More appropriate."

As for the others, Tian Qing performed well. Wu Feifei and Duan Yun didn't listen very carefully because their fields were irrelevant. They were busy doing their own things. Chen Wanqing, Mo Wenlin, Han Jiaying and Wu Shengnan tried to listen carefully, but Basically, I can't understand it. I can understand three or five words after listening to a sentence, so I can only try to understand it by referring to the PPT.

Xu Qiu found that there is quite a big difference between scholars who really engage in theoretical research and those who engage in materials. For different systems, except for the molecular structure of the material, other test and characterization methods are almost the same, and it is not difficult to understand.

This is probably the reason why there are far fewer people engaged in theory than those engaged in materials, because the threshold is relatively high.

At the very beginning, Xu Qiu was still thinking about "Materials in the left hand, theory in the right hand, like to mention CNS". Gradually, he realized that the power of a single person is limited after all, just like the current ITIC system, if only he does it alone, No matter how good he is, working 16 hours a day, he can't cover everything, at most he can specialize in one or two fields.

Therefore, for the time being, Xu Qiu didn't plan to go too deep into the mechanics, he just wanted to learn a little bit first, to the point where he could understand the conclusions given by others.

There is a specialization in the art industry. Instead of spending a lot of time and energy on learning theory-related knowledge at this stage, it is better for him to provide a research system and let researchers who specialize in theory do the research for a win-win situation.

What's more, the system can play a greater role in the optimization of materials, but it has a relatively small effect on the deepening of theoretical research. Basically, the improvement in this area can only be achieved by Xu Qiu's own reading of literature and books, with half the effort.

The communication will continue in the afternoon, but this time it is a private communication, so only members of Mr. Wei's research group will participate.

Tian Qing reported her CELIV results, and Xu Qiu's report included two aspects, one was the previous PPT exchange with Gong Yuanjiang, and the other was the latest progress on ITIC.

This was the first time Xu Qiu gave a speech in English, and he was still a little nervous. Fortunately, most of the audience were familiar teachers and classmates, and the work was all his own work, so he didn't show it too obviously.

Ronald was more interested in Xu Qiu's report on the ITIC system, and asked many questions:

"What is the difference between this ITIC system and the traditional PCBM system?"

"Has the ITIC system tested the bright state CELIV, and what is the result?"

Xu Qiu answered one by one.

In the end, Ronald offered: "If possible, I will bring a batch of samples to carry out preliminary research when I go back this time."

Wei Xingsi immediately nodded in agreement and asked Xu Qiu to arrange the sample preparation. Xu Qiu then asked Mo Wenlin to start preparing the two standard sample systems of H22:ITIC and PBDB-T:ITIC.

Academic exchanges and PPT reports are only one aspect, the main purpose is to reach cooperation intentions between different research groups.

Like this Wei Xingsi research group provides a research system, Ronald is in charge of the research, and Wei Xingsi can post articles after the results are produced. Although it is not the first work or the first newsletter, it is still an article.

For example, some bigwigs have been working in scientific research for 20 to 30 years, and have published hundreds of thousands of articles. Many of them are collaborative articles produced by cooperation everywhere. possible.

The academic circle is also a place where everyone carries sedan chairs.

On Friday, Wei Xingsi sent Ronald to the airport, and Ronald boarded the plane back to Finland with more than a dozen well-sealed devices manufactured by Mo Wenlin, officially ending the exchange visit.

The overall itinerary of this foreigner's exchange visit is similar to that of Xu Qiu's last meeting, except that they were guests last time, and this time they are hosts.

PS: Ask for a recommendation ticket on Monday, and there will be two consecutive updates.