I Have a Research Support System

Before the defense, Xu Qiu printed out six graduation thesis and handed them over to the class monitor of Material Hua in advance, and he was responsible for distributing them to several defense teachers.

The school’s printing shop is relatively cheap, double-sided printing only costs 8 cents a sheet, and if it is placed outside the printing shop, the price will be ten times higher, but the cover of the thesis is made of special paper, which is more expensive, costing 10 yuan For one copy, Xu Qiu spent more than 100 Ruanmei coins just to print these papers.

In the audience, several defense teachers each got a copy of Xu Qiu's graduation thesis.

Zhou Mathematics, as the director of the Material Science Teaching and Research Section, is also a friend of Wei Xingsi. He met Xu Qiu at the dinner on New Year's Day before, and he is quite familiar with Xu Qiu. Although he saw a thick graduation thesis, he was surprised, but After thinking about it for a while, I figured it out, it should have put several jobs into it; Yu Qiang, as a counselor, is also very clear about Xu Qiu's situation; Wei Xingsi needless to say. The three of them are very calm.

However, the other three teachers were not so calm. They exchanged in low voices while flipping through the papers.

The teacher who taught Material Chemistry said: Why are undergraduates' graduation thesis so thick? It is twice as thick as the last classmate who defended... Let me see, it is actually 120 pages!

The teacher of Polymer Condensed Matter Physics kept his eyes on the catalog of the graduation thesis, and added: I just saw that he said on the PPT that there are four jobs. I thought I was wrong, but it turned out to be true.

The teacher of Polymer Chemistry said to Wei Xingsi through Zhou Mathematics: Mr. Wei, are you a student?

Wei Xingsi smiled, and proudly said: Actually, Xu Qiu has more than these four jobs. He just recently published an article in Nature Communications and a review on ACSEL, which was not included.

Undergraduate students, only six papers are written once, and six papers are written second, and the first paper has the level of AM and Nature Communication... The teacher of Polymer Condensed Matter Physics said with emotion: This academic achievement, It is much better than several doctoral students in our group.

The teacher of Polymer Chemistry thought to himself: The number of high-quality articles published by our group in three years is not as much as Xu Qiu's undergraduate student in one year...

Naturally, he didn't say this, it was really hard to say, but he looked at Xu Qiu with a lot of eagerness, thinking in his heart: If he can...

Wei Xingsi quickly noticed the unnaturalness of the teacher of Polymer Chemistry, and said bluntly with a smile: Don't think too much, Xu Qiu is now my direct Ph.D. student.

The teacher of Polymer Chemistry paused, and said helplessly, Hey, why can't I accept such students.

In fact, he now has the opportunity to snatch the students. After all, Xu Qiu has not formally enrolled, so there is a lot of room for maneuver. Even after enrolling, he can change the instructor.

However, the scientific research circle is a place where shame is taken. Unless it is the kind of two people who have a direct conflict of interest, they will generally not be able to grab students to this extent.

Therefore, after Wei Xingsi made a strong statement, the teacher of Polymer Chemistry had no other thoughts.

Although the voices of the teachers below were not loud, Xu Qiu could vaguely hear them. On the one hand, the podium is very close to the first row of seats; on the other hand, this defense report is not too stressful for Xu Qiu, even if he closes his eyes and does not read the PPT, he can speak it out, so he did not devote all his attention .

Xu Qiu's face remained unchanged, and his speech speed slightly accelerated.

At this point, he has finished the introduction and started to talk about the first job:

This is my work published in AM. I designed and synthesized a highly crystalline polymer donor material PCE11, which was combined with the traditional fullerene derivative material PC[70]BM to prepare organic solar cells. device, the highest photoelectric conversion efficiency can reach 11.11%...

The other three works were briefly mentioned: The original material of PCE11 material, the development work of PBT4T, was published in ACSAMI, the side chain regulation work based on PCE11 was published in AEM, in addition, there is a work based on flexible substrates, published in On Macromolecules...

This is the academic achievement I obtained during my undergraduate period, and the published articles...

Finally, I would like to thank my supervisor, Professor Wei Xingsi, and all the defense teachers for participating in my graduation defense.

After Xu Qiu's speech, Zhou Mathematics stopped the stopwatch and said, The time is very well controlled, nine minutes and forty seconds, teachers, do you have any questions?

Several teachers flipped through Xu Qiu's graduation project, but no one spoke. They had been chatting just now, and they didn't listen to Xu Qiu's report at all...

Zhou Mathematics had no choice but to go out in person and said, Tell me a brief description of the most important problems in the field of organic photovoltaics at present.

Currently, the most important issue... Xu Qiu repeated, after a moment of consideration, he talked eloquently: It is the photoelectric conversion efficiency in the field of organic photovoltaics, compared with traditional inorganic silicon solar cells, and the emerging perovskite Mining photovoltaic devices are still relatively low.

From the perspective of short-circuit current density, on the one hand, it is limited by the exciton absorption of organic photovoltaic materials, resulting in a relatively narrow range of light absorption; Nano-thick films, usually the film thickness of the effective layer is only about 100 nanometers, which further increases the light absorption loss.

From the perspective of open circuit voltage of the device, the energy loss of the traditional fullerene system is relatively high, and the HOMO/LUMO energy level difference of more than 0.3 electron volts is required as the driving force to achieve effective exciton splitting.

Zhou Mathematics nodded and asked, Then what do you think the next improvement method is?

Xu Qiu continued: The development of non-fullerene acceptor materials, on the one hand, makes up for the shortcomings of traditional fullerene materials that hardly absorb visible light. On the other hand, there is experimental evidence that the energy loss and driving force requirements of non-fullerene systems Different from the traditional fullerene field, there is an opportunity to simultaneously increase the short-circuit current density (Jsc) without sacrificing the open-circuit voltage (Voc), breaking the seesaw relationship between Jsc and Voc in the traditional fullerene field...

This is also my next research direction. I have already achieved preliminary results, but I haven't put them here...

Okay, you teachers also come to ask a few questions. Zhou Mathematics looked around. In fact, he only understood the general idea. After all, industries are different, and every industry is like a mountain.

What is the value of 11% efficiency in the field of organic photovoltaics? asked the teacher who taught Chemistry of Materials.

The current world record is 12.21%, which is based on the PCE10:PC[70]BM system. Xu Qiu replied.

Wow, that's very close, not bad. The teacher who taught Material Chemistry sighed, then stopped making a sound, and lowered his head to score on the scoring sheet.

Next, the rest of the teachers all referred to Xu Qiu's graduation thesis and asked some questions seriously, and Xu Qiu answered them one by one.

Finally, Zhou Mathematics concluded: The defense is over, Xu Qiu, you can leave, and call the next classmate in by the way.

Thank you, teachers. Xu Qiu said to the defense judges again, turned and left. He glanced at the next student who participated in the defense. It was Deng Zuxin, a student with a middle grade in the class. It should be to choose to work directly.

Xu Qiu silently expressed his apologies to him in his heart, as he was behind me in the queue, Bi She's grades probably would be affected.

Walking all the way back to 216 on the first floor of the materials, Xu Qiu found that all the other six people in the research team were there.

Sister, why didn't you go to Zhangjiang to do synthesis? Xu Qiu asked curiously.

Just as Han Jiaying was about to speak, Tian Qing took the initiative to explain: It's like this, today is Children's Day, we decided to organize a group to eat the children's set menu of Kaifeng cuisine, it is said that we can get a small toy, Xu Qiu, you can come with us.

Xu Qiu glanced at the junior girl and saw that she looked eager to try, so she nodded and said, It just so happened that Mr. Wei was delayed by the graduation defense of undergraduates. The plan was very careful.

Tian Qing chuckled and said, He didn't participate in my defense last year. This is the first time he participated in it this year. I didn't know it would take such a long time. If he had known in advance, I don't think he would have participated.

That's true. Xu Qiu nodded. According to Mr. Wei's character, he usually pushes such things away as soon as he can.

At 11:30 in the morning, the crowd rushed towards Kaifeng Cai in the business district next to Daxue Road.

Then, I found that there were a lot of people in the store, some of them were students from the nearby Shanghai Metropolitan Comprehensive University, some white-collar workers in the nearby CBD, and even a group of aunts and uncles from the surrounding communities...

Xu Qiu complained inwardly, as expected, no matter how old or young, everyone has a childlike innocence...

What should we do? Duan Yun hesitated, Should I...

Come here, order a good meal, take a number and so on. Tian Qing looked at the dark crowd and gritted her teeth.

Then what to eat? Duan Yun asked again.

I checked in advance. This year's theme is the Pokémon series. There are three kinds of toys in total. Every time you order a set meal, you will get one free. We just need to collect a set. Tian Qing thought for a while and suggested:

There are seven of us, order three meals for two, and then add a family bucket.

OK.

Can.

no problem.

Everyone had no objections, so Tian Qing scanned the QR code and placed the order directly from her mobile phone.

After waiting for more than half an hour, I finally got the meal and three different toys that came with it, including Dada Duck with a swimming ring, Pang Ding Pishen music box, and a Pishen watermelon water bottle. Everyone sat around a table , a few girls took pictures of the toys with great interest.

Han Jiaying also posted a circle of friends, a few accompanying pictures, and a sentence:

Good-looking skins are all the same, but lovely souls have to pass Children's Day.

Although Xu Qiu really wanted to complain, but under pressure, he went to like it.