Chapter 45: Just ask for 8%

　　 The next day, Xu Qiu had breakfast and came to the first floor of the material at 8 o'clock in the morning.
　　 He opened the laboratory's access control system before, so he can directly use the campus card to enter the laboratory.
　　 At this time, Teacher Wei and the others in the laboratory have not yet arrived.
　　 He mainly cares about the latter. If he comes early, no one will grab the glove box with him.
　　 Before Xu Qiu left yesterday, he temporarily replenished six sets of solutions, plus the first set made, for a total of seven sets of solutions.
　　 There are eight substrates left, which can be allocated to two of the solution with the best conditions, and one for the other solutions.
　　……
　　 After spin coating the effective layer, Xu Qiu started to wipe the film.
　　 At this time, he suddenly heard the sound of "Da Da Da" coming from the corridor.
　　 This voice is like Teacher Wei.
　　 Having been in the laboratory for a long time, Xu Qiu is already familiar with the sound of this leather shoe.
　　 He has always been curious, did Teacher Wei deliberately make a voice to remind his students "He is coming"?
　　 Wei Xingsi walked to the door of 216 and saw the light inside the door was on. He was a little surprised. He stretched out his hand and glanced at his watch. The time was 8:50.
　　 So, he pushed the door in and found no one at the desk, only a schoolbag on the chair.
　　 He looked at the laboratory again.
　　 Isn't that Xu Qiu?
　　 "Hello, Teacher Wei." Xu Qiu stopped working and greeted him actively.
　　 "Xu Qiu, why did you come so early?" Wei Xing thought.
　　 "If you come later, Feifei Wu and Senior Sister Chen Wanqing will use the glove box, I can't grab them." Xu Qiu said.
　　 Hearing this was the reason, Wei Xingsi smiled and said:
　　 "You have to take the initiative to do experiments. I used to grab the glove box with my seniors when I was abroad."
　　 Xu Qiu didn't know how to answer the conversation, so she smiled awkwardly.
　　 "By the way, how is your work done recently? I have been listening to Chen Wanqing complimenting you, saying that you have helped her a lot." Wei Xing thought.
"I'm currently working on flexible substrate devices. I just made the first batch yesterday. The PTB7-TH system used can achieve the highest efficiency of 6.9%, and the P3HT system is 4% more. Today I plan to make another batch of devices. I feel that by optimizing the conditions, the efficiency can be further improved." Xu Qiu said.
　　 "The efficiency of 7% can be achieved, that is not low, have you read the relevant literature, has anyone else done the software of the PTB7-TH system." Wei Xing thought.
　　 "No, they are all based on other systems, mainly the P3HT system." Xu Qiu said.
　　 "That's great, you can see if the efficiency can be mentioned further, if it can reach 8%, 9%, you can post a small article." Wei Xing thought.
　　 Wei Xingsi originally wanted to pat Xu Qiu on the shoulder, but saw that he was wearing a lab coat, then took his hand back and said:
　　 "Okay, then you are busy, after the test today, report the results to me."
　　 "Okay." Xu Qiu said.
　　 This can actually post articles, Xu Qiu is a little puzzled.
　　 When the senior sister mentioned the phenomenon of irrigation in academic circles, he still felt that the issue of irrigation of papers was far away from him, and he did not expect that it would be his turn now.
　　 However, it is the first article after all, so let's fill it with water. Quandang has accumulated experience for his future scientific research.
　　……
　　 Around 9:30, Wu Feifei and Duan Yun also came to the laboratory one after another.
　　 Xu Qiu has finished the spin coating, put the sample into the vapor deposition chamber, began to vacuum, prepare for vapor deposition.
　　 As soon as Chen Wanqing entered the laboratory, he heard the noise from the mechanical pump. Upon closer inspection, it turned out that Xu Qiu was using it.
　　 "School brother, when did you come?" Chen Wanqing said.
　　 "It's past eight o'clock, I just met Teacher Wei, and he said that I should grab the glove box with you."
　　 "Puff" Chen Wanqing laughed out: "This is indeed like his speaking style, what else did he say to you."
　　 "I told him yesterday's test results, and he said he could post a short article." Xu Qiu said.
　　 "It's true, you haven't told me about the result yesterday, are you very efficient?" Chen Wanqing said.
　　 "About 7%, PTB7-TH system." Xu Qiu said.
　　 "Not bad," Chen Wanqing said:
　　 "If the efficiency is higher, it is estimated that a periodical of the second zone crane tail can be published, such as ACSAppl.Mater.Interfaces, or the third zone RSCAdv.
　　 I didn't expect the school brother, this is only two months after joining the group, I will have an article. "
　　 "I didn't expect it either. Before, I just wanted to complete the project that Teacher Wei gave me." Xu Qiu said.
"The school’s projects are easy to say, he is to train you, even if the efficiency test is 1%, as long as the characterization is completed, a few more PPT pages, and the conclusion report looks fuller. It is easy to pass the project acceptance. It’s an undergraduate project."
　　"Actually, it is not too difficult to post articles. The second and third districts are still relatively easy, as long as the efficiency is similar, and then a little bit new and different from others.
　　 If I had started using the PTB7-TH system, the results may be faster, but it is estimated that it will cost a lot of materials.
At that time, the evaporation conditions were the most difficult to touch, because during the entire evaporation process, I didn’t know what was going on inside. Only after the evaporation was over and the device was tested, could we get the data and analyze where it might appear. Problem.
　　 At that time, the efficiency of making devices for a month was close to 0~EbookFREE.me~ It was a dark time. "
　　 "Senior sister, this is the predecessor who planted trees, and the descendants will enjoy the cold." Xu Qiu said.
"To each other, you also helped me a lot," Chen Wanqing said: "Two people in a field are still better than one person working alone. If you have any questions, you can discuss with each other. Look at Wu Feifei and Duan Yun. Often a bitter face."
　　 "Speak down, watch out for them to hear." Xu Qiu smiled.
　　…………
　　The evaporation is completed.
　　 Xu Qiu first tested two substrates under the best conditions, and the efficiency was 7.57% and 7.68% respectively.
　　 Although it is an increase from 6.92% yesterday, it still lacks meaning.
　　 He tested the remaining six pieces again. He didn't have much hope for them, but he didn't expect to have an unexpected surprise.
　　 has the highest efficiency of 7.86%, which is only a drop from 8%.
　　 depends on the conditions, it is "23 mg per milliliter, 1:1.3 to the receptor, 0.7% volume fraction + chlorobenzene solvent, 2200r.p.m.".
　　Moreover, the speed of this solution has not been adjusted, so it is quite possible that the efficiency will exceed 8%.
　　 As for 9% of what Teacher Wei said, Xu Qiu regarded it as a joke.
At present, he does not see the way that the efficiency of this system can achieve 9%. Perhaps replacing the two transport layer materials PEDOT: PSS and calcium can further optimize the device performance, but he has no relevant experience to change it hastily and has worked out. Under the experimental conditions, the greater the probability, the lower the efficiency of adjustment.
　　 Basically only the effective layer can be changed, and he has tried more than 70 conditions for the effective layer, and there is not much room for further improvement.
　　 Therefore, he only asks for an 8% now.