Chapter 291: Good-looking skins 0 chapters 1 law...

Before the defense, Xu Qiu printed out six graduation papers and handed them to the talented small monitor in advance, who was responsible for distributing them to several defense teachers.
The school’s print shop is relatively cheap. It only costs eight cents for a double-sided printing. If it is placed outside the printing shop, the price will be ten times higher. However, the cover of the paper is made of special paper, which is more expensive. One copy, just to print these papers, Xu Qiu spent a total of more than one hundred soft sister coins.
In the audience, several defense teachers each got a copy of Xu Qiu's graduation thesis.
Zhou Mathematics, as the director of the teaching and research section of Achievement, is also Wei Xingsi’s friend. He also met Xu Qiu during the New Year’s Day dinner. He was quite familiar with Xu Qiu. He saw a thick graduation thesis. Although surprised, After thinking about it for a while, I figured it out. I should have put a few jobs in. As a counselor, Yu Qiang was also very clear about Xu Qiu's situation; let alone Wei Xingsi. The three of them are very calm.
However, the other three teachers were not so calm. They talked quietly while flipping through the papers.
The teacher who teaches "Chemistry Chemistry" said: "Why is the undergraduate's graduation thesis so thick? It is twice as thick as the last respondent...Look at it, it has 120 pages!"
The teacher of "Polymer Condensed Matter Physics" kept his eyes on the catalogue of his graduation thesis and added: "I just read his PPT and said that there are four jobs, I thought I was wrong, it turned out to be true."
The teacher of "Polymer Chemistry" said to Wei Xingsi across Zhou Mathematics: "Mr. Wei, are you a student?"
Wei Xingsi smiled and said proudly: "Actually, Xu Qiu has more than these four jobs. He just published an article "Nature Communications" recently, as well as a review on ACSEL, which was not included."
"Undergraduates, there are six articles in one article and six articles in two articles, and one article has AM and Nature Communications..." The teacher of "Polymer Condensed Matter Physics" said with emotion: "This academic achievement, A lot better than the few 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 that of Xu Qiu's undergraduate in one year..."
Naturally, he didn't say this, it was really hard to tell, but his eyes became much more eager when he looked at Xu Qiu, thinking in his heart: "If you can take him..."
Wei Xingsi quickly discovered the unnaturalness of the teacher of "Polymer Chemistry", and said with a smile: "Don't think too much about it. Xu Qiu is now my direct PhD 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 grab students. After all, Xu Qiu has not formally enrolled, and there is a lot of room for operation. Even after enrolling, he can change the instructor.
However, the scientific research circle is always a place where it wants to be ridiculous, unless it is the kind of two who have a direct conflict of interest, otherwise they will generally not be able to grab students to such a degree.
Therefore, after Wei Xingsi made a strong statement, the teacher of "Polymer Chemistry" had no other thoughts.
Although the teachers below are not talking loudly, Xu Qiu can still vaguely hear them. On the one hand, the podium is very close to the first row of seats; on the other hand, Xu Qiu's defense report is not very stressful. Even if he closes his eyes and does not read the PPT, he can speak out, so he did not devote all his attention to it. .
Xu Qiu didn't change his face, but his speech speed increased slightly.
At this point, he has finished the introduction and started to talk about the first job:
"This is my work published on AM. I designed and synthesized a highly crystalline polymer donor material PCE11, which is combined with the traditional fullerene derivative material PC[70]BM to prepare organic solar cells. The device, the highest photoelectric conversion efficiency, can reach three other work in one stroke: "The original material of PCE11 material, the development work of PBT4T, was published in ACSAMI, and the side chain control work based on PCE11 was published in AEM. In addition, there is another The work based on flexible substrates was published on "Macro Molecules"..."
"This is the academic achievement I got during my undergraduate study, and the article I published..."
"Finally, I would like to thank my mentor, Professor Wei Xingsi, and thank 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. Do you have any questions, teachers?"
Several teachers flipped through Xu Qiu’s graduation project, and no one spoke. They had been chatting just now and did not listen to Xu Qiu’s report seriously...
Zhou Mathematics had no choice but to go out in person and said: "A brief description of the organic photovoltaic field. At present, you think the most important problem."
"At present, the most important problem..." Xu Qiu repeated, thinking for a moment, and talking freely: "It is the photoelectric conversion efficiency in the field of organic photovoltaics, compared with traditional inorganic silicon solar cells and the emerging perovskite Mine 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 narrow light absorption range. On the other hand, the exciton diffusion distance is short, making it difficult to prepare films with a thickness of more than 200 or 300. Nano-thick films usually have an effective layer thickness of only about 100 nanometers, which further increases the light absorption loss."
"From the perspective of the open circuit voltage of the device, the energy loss of the traditional fullerene system is relatively high, and an energy level difference of more than 0.3 eV is required as a driving force to achieve effective exciton splitting."
Zhou Mathematics nodded and asked, "Then what do you think is the next improvement method?"
Xu Qiu continued: "The development of non-fullerene acceptor materials, on the one hand, makes up for the shortcomings of traditional fullerene materials that almost do not absorb visible light. On the other hand, there is experimental evidence showing the energy loss and driving force requirements of non-fullerene systems. Different from the traditional fullerene field, there is an opportunity to increase the short-circuit current density (Jsc) at the same time without sacrificing the open circuit voltage (Voc), breaking the seesaw relationship between Jsc and Voc in the traditional fullerene field..."
"This is also the direction of my next research. I have already had preliminary results, but I haven't put it here..."
"Okay, some of your teachers will also ask some questions." Zhou Mathematics looked around. In fact, he just understood the general idea, after all, the industries are different, and the lines are like mountains.
"What is the level of 11% efficiency in the field of organic photovoltaics?" the teacher who taught "Material Chemistry" asked.
"The current world record is based on the system." Xu Qiu replied.
"Wow, that's very close, not bad." The teacher who taught "Material Chemistry" sighed with emotion, and then stopped making a sound, lowered his head to score on the score sheet.
Next, the remaining teachers all referred to Xu Qiu's graduation thesis, and asked some serious questions, and Xu Qiu answered them one by one.
Finally, Zhou Mathematics concluded: "The defense is over, Xu Qiu, you can leave, by the way, call the next classmate in."
"Thank you teachers." Xu Qiu said to the defense judges again, and turned to leave. He glanced at the next student participating in the defense, Deng Zuxin, a student in the middle of the class, with a low sense of existence. After graduation Should choose to work directly.
Xu Qiu silently apologized to him in his heart. He ranked behind me, and Bishe's results would probably be affected.
Wandering all the way back to the first floor of Materials 216, Xu Qiu found that the other six people in the research group were all at ~EbookFREE.me~Get cash] Follow vx public. Public number [Book Friends Base Camp~EbookFREE.me~ Also Can receive cash!
"School girl, why didn't you go to Zhangjiang to do synthesis?" Xu Qiu asked curiously.
Han Jiaying just wanted to speak, Tian Qing took the initiative to explain: "That's it. Today is Children's Day. We decided to organize a group to eat the children's set meal of Kaifeng dishes. It is said that we can get a small toy. You can come with Xu Qiu. "
Xu Qiu glanced at the school girl, and when she saw her eager to try, he nodded and said: "It just so happened that Mr. Wei was dragged by the undergraduate graduation defense. The plan is very careful."
Tian Qing smiled and said: "He did not participate in my defense last year. This is the first time to participate this year. I don't know it will take such a long time. If I know in advance, I guess he may not participate."
"That's true." Xu Qiu nodded. According to Teacher Wei's personality, he usually pushes things like this.
At 11:30 in the morning, the crowd smashed toward 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 Magic University, some white-collar workers in the nearby CBD, and even the aunts and grandpa groups in the surrounding communities...
Xu Qiu complained inwardly. As expected, everyone, young and old, has a childlike heart...
"What shall we do?" Duan Yun hesitated: "Want to..."
"I'm here, order a good meal, get a number, etc." Tian Qing gritted his teeth while looking at the dark crowd.
"Then what to eat?" Duan Yun asked again.
"I investigated in advance. This year's theme is the Pokémon series~EbookFREE.me~ There are three toys in total. Every time we order a set, we will get one. We just collect one set." Tian Qing thought. Thought, proposed:
"Seven of us, order three meals for two, and then add a family bucket."
"Row."
"can."
"no problem."
Everyone had no opinion, so Tian Qing scanned the code and placed the order directly from the phone.
After waiting for more than half an hour, I finally got the meal and got three different toys included, including the Dada duck in the swimming ring, the fat Ding Pishen music box, and the Pishen watermelon kettle. Everyone sat on a table. , A few girls enthusiastically took pictures at the toy.
Han Jiaying also posted a circle of friends, a few pictures, and a sentence:
"The good-looking skins are the same, and the lovely souls have to pass Children's Day."
Although Xu Qiu wanted to vomit very much, under pressure, he still liked it.