Chapter 65: Happy troubles

　　 "Xu Qiu?"
　　 "Senior sister?"
　　 "What are you doing here?"
　　 "Experiment, how about you, senpai?"
　　 "Help you to change the article, how is it, I am moved."
　　 "I'm so moved and crying, it's not right, I'm also helping you with experiments."
　　 "It seems to be oh, that's even, yes, what about the results of the experiment, how?"
　　 "The result, guess?"
　　 "Hmm... Yesterday's efficiency was less than 5%," Chen Wanqing thought for a moment and said:
　　 "Is it 6%, 7% today?"
　　 Xu Qiu shook his head expressionlessly.
　　 "Is it high or low?" Chen Wanqing asked.
　　 "It's low," Xu Qiu said.
　　 "Then, 8%?"
　　 After Chen Wanqing finished speaking, she carefully observed Xu Qiu's expression.
　　 She muttered in her heart, as if she was still crying low, she asked tentatively:
"9%?"
　　 Xu Qiu still shook his head.
　　 "No way," Chen Wanqing was a little afraid to say: "Is it more than 10%?"
　　 "bingo," Xu Qiu smiled triumphantly:
　　 "The highest efficiency of this batch of devices is 10.44%."
　　 "How did you do it? Only after trying two batches of devices, the efficiency can be so high." Chen Wanqing said in surprise.
　　 "Maybe luck," Xu Qiu shrugged and said:
　　" After I went back yesterday, I analyzed the reasons for the failure of the first batch of devices and thought that the transmission layer may be too thick.
　　 So, today I adjusted the concentration of the perovskite solution, and I didn’t expect it to be a success. Among the four groups of materials, 4# has the best performance, and 2# is also OK, with an efficiency of 9.6%. "
　　 In fact, Xu Qiu himself thinks that he can succeed this time, and it is true that luck has a large proportion.
　　 If the four materials he selected are not suitable for the transmission layer, then it is useless no matter how he adjusts the experimental conditions.
　　 On the other hand, hard work is also indispensable. Three batches of devices are made in two consecutive days, compared to nearly 20 hours of high-intensity work in 48 hours.
　　 It is very uncomfortable to experiment in the glove box in summer. Even if the air conditioner is used to cool down, after the experiment, the whole person is like a sauna.
　　 "Is there a chance to make the efficiency higher, for example, to more than 11%?" Chen Wanqing asked.
　　 "I personally feel that the possibility is not high," Xu Qiu said:
　　" After all, it is only a transmission layer material, and the photoelectric conversion efficiency of the device mainly depends on the effective layer.
　　 Anyway, I will have to do repetitive experiments later, and then try again. You can also try the structure. "
　　"If it can reach 11%, the grade of the article may be higher. In this case, it is estimated that it is another article on the tail of the second district crane.
　　 However, this article can be posted, and there are relatively few experiments to make up. "Chen Wanqing said.
After 　　 said, she said with emotion:
　　 "Unexpectedly, my last article has not yet been followed. I haven't finished editing your article. I will write a new article soon."
　　 "This is the trouble of happiness." Xu Qiu said.
　　 The two were silent for a while, and Chen Wanqing seemed to say casually:
　　 "By the way, brother, do you have any thoughts on this article?"
　　 "What, a work?"
　　 Xu Qiu had never thought about this issue before, and in his mind he had always assumed that he was doing experiments for the senior sister. Now think carefully:
　　 At the beginning, the senior sister proposed an idea, but he did the core experimental design and experimental operation.
　　 If the follow-up supplementary experiment and article writing were all done by him, it would be a well-deserved one for him.
　　 However, there is no need to grab a piece of SCI in the second district. She has to publish four articles in the second district and one in three years to graduate.
　　 For him, regardless of early graduation, he still has six years to graduate from his Ph.D. There will be no shortage of articles.
　　 Thinking of this, Xu Qiu said:
　　 "There is no need to give me a game. This idea was originally proposed by my senior sister, so I thought I was helping you experiment. Just give me a second game like the last one."
　　 "If you make a contribution, the second game is not suitable, or we should be one?" Chen Wanqing said.
　　 "What is the same?" Teacher Wei's voice unexpectedly came from the door.
　　 Both of them were surprised, they did not hear Teacher Wei's footsteps at all.
　　 "Wei, good teacher Wei, it is like this," Chen Wanqing said nervously:
　　" Xu Qiu tried out the idea of ​​the perovskite transmission layer I mentioned before. He used a positive structure instead of PEDOT, and now the maximum efficiency exceeds 10%, which is 0.3% higher than the standard."
　　 "Oh," Wei Xingsi looked at Xu Qiu with satisfaction, and said happily:
　　 "I found the treasure, tell me how to do it."
　　 Xu Qiu began to introduce in detail:
　　" I first asked Feifei Wu, took a review of perovskite from her, and screened out some perovskite materials with wide band gap.
　　 Then, four solutions of MAPbBr3, MAPbCl3, FAPbBr3 and FAPbCl3 were prepared using the existing materials in the laboratory, all with wide band gap.
　　 Next, the perovskite solution was spin-coated by the one-step and anti-solvent method to obtain a smooth film with a thickness of about tens of nanometers, which was used to replace PEDOT as a hole transport layer.
　　 The other preparation methods are the same as those of the standard samples. Finally, the device based on the FAPbCl3 transport layer has a maximum efficiency of 10.44%. "
　　 "This idea is really good," Wei Xingsi nodded and said:
　　" One of the advantages of perovskite materials is their high charge mobility. In addition, you choose a wide band gap material, which is very thin, almost does not absorb sunlight, and has a good appearance.
　　 In theory, it is indeed a better transmission layer material.
　　 That is, there are still relatively few people doing perovskite now~EbookFREE.me~ I guess even if we don’t do this job, someone else will do it in a while.
　　 So, hurry up and get this article out. Although it may be just a small article, you can't let your efforts go to waste. "
　　 "Okay." Xu Qiu and Chen Wanqing nodded at the same time.
　　 Wei Xingsi looked at the two back and forth for a while, and said:
　　 "As for what the article is about, you can decide by yourself.
　　 When this article is finished, Chen Wanqing can take him to Zhangjiang to do synthesis. In this field, if you want to post a good article, you still have to synthesize new materials yourself. "
　　 By the way, I just bought you a box of salt soda. The courier called me and said it was delivered to the door of my office. Xu Qiu, come and move it. "
　　……
　　 on the way.
　　 "I will come over on Saturday to do the experiment. It's hard work," Wei Xingsi exclaimed, "Like when I was young."
　　 Xu Qiu wanted to say that he had forgotten that it was Saturday, but he changed his words:
　　 "The main reason is that I have experimental inspiration in my heart, so I want to come over and verify it quickly. I didn't expect it to be successful just once."
　　 "Okay, work hard here. If there are any problems in life or experiments, you can tell me, don't have any scruples." Wei Xing thought.
　　 "Okay." Xu Qiu saw the salt soda at door 218, and said, "Is that this?"
　　 "Well, move back." Wei Xing thought.
　　 Xu Qiu moved the salt soda to 216, opened the package with scissors, took out two bottles, and handed one bottle to the senior sister.
　　 Then he unscrewed the lid and took a sip.
　　 I, how hot, there is a plastic smell.
　　 Forget it, will just drink it.