Chapter 109: Mentor direct school girls

　　 Xu Qiu saw that the new junior Han Jiaying was also there, so he called her over.
　　He was going to make devices while giving her an introductory guide. By the way, he would see how savvy this school girl was and whether it was good material for scientific research.
　　 When Chen Wanqing was teaching him, he used the "toothpaste squeeze" method, that is, to teach him each experiment step by step.
　　 However, Xu Qiu's preferred teaching method is "first overall and then partial".
　　 is to know the entire operation process first, and then learn the specific experimental operations in fragments.
　　 First of all, we must understand the progress of school girls.
　　 "Han Jiaying, have you come to the laboratory for a week, what have you learned?"
　　 "Senior Sister Chen Wanqing taught me the safety rules of the laboratory this week, and also taught me how to clean the substrate," Han Jiaying said:
　　 "Besides, there seems to be nothing else. Brother Xu Qiu intends to teach me other experimental operations?"
　　 "Well, today I am going to make a batch of devices, you can follow me to watch my experiment, you can ask any questions if you have any questions." Xu Qiu said.
　　 "Okay." Han Jiaying nodded.
　　 "The lab coat has been used, and the basic protective measures will be done." Xu Qiu said.
　　 "I have used it, and the protective measures my sister taught me before." Han Jiaying said.
　　 "Okay, then come to the lab with me."
　　……
　　 Entering the laboratory, before Xu Qiu could speak, Han Jiaying volunteered:
　　 "Brother do you want to make a device, let me clean the substrate for you."
　　 This school girl is on the road.
　　 "Okay, not too much. For today, 12 pieces are enough."
　　 Xu Qiu finished speaking, went into the spin-coating glove box, and began to prepare the solution.
　　 The results of this experiment are not important, just to get some data for the Monday group meeting.
　　 Therefore, he plans to use a chlorobenzene solvent that dissolves polymers better.
　　 After the preparations were completed, he did not immediately start preparing the solution, but patiently waited for Han Jiaying.
　　 After putting the box containing the substrate into the ultrasonic cleaner, she leaned over and stood beside Xu Qiu.
　　 "This is the polymer material I synthesized in Zhangjiang this week. I will use it as an effective layer material to prepare devices later." Xu Qiu introduced:
　　 "This is PC[70]BM, which is a commonly used acceptor material in organic photovoltaics. The polymer material just now is a donor material."
　　 "When weighing, first weigh the polymer material that is difficult to weigh, then weigh the weighed powder PCBM, and finally add the solvent and magnetic stirrer."
　　Han Jiaying listened carefully, and every time Xu Qiu said a word, she nodded.
　　 However, she did not speak and asked questions.
　　 Probably the two are not familiar enough, and the relationship between people takes time to slowly get closer.
　　 Xu Qiu didn't intend to be too proactive, but just introduced it to herself. Anyway, after explaining it this way, she can always learn something.
　　At this time, the ultrasonic cleaner reaches the set time and automatically stops.
　　 "Brother, I'm going to change the solvent."
　　 "Go ahead."
　　 A few minutes later, Han Jiaying returned.
　　 "To prepare the prepolymer solution of zinc oxide, zinc acetate dihydrate, 2-methoxyethanol and ethanolamine are used." Xu Qiu continued:
　　 "Mix it in a certain proportion, put it on the heating and stirring table, and it can be used in about two hours."
　　 Ten minutes later, Xu Qiu prepared the two solutions and left the spin-coating glove box, intending to go back to the desk to rest for a while.
　　 Han Jiaying pointed to the glove box, hesitated for a moment, and finally spoke:
　　 "Brother, this instrument is a glove box, can I try it?"
　　 Seeing her look expectant and cautious, Xu Qiu smiled:
　　 "Yes, I will teach you by the side."
　　 Although this will take up some of his time, Han Jiaying is after all her direct school girl, and it is worth putting in some energy.
　　 Just like the original self, when she encountered problems in the experiment, when she consulted the senior sister, she was responsive.
　　 "It is filled with nitrogen, mainly to provide a relatively inert atmosphere, to ensure that the device will not encounter oxygen or water molecules and deteriorate."
　　 Xu Qiu finished speaking and pointed to the pedals on the ground:
　　"These two control the air pressure in the glove box, the left one is pressure reduction, and the right one is pressure increase.
　　Usually, the left-hand step-down pedal is used. The step-up pedal is rarely used, because if the air pressure in the glove box is insufficient, it will automatically supplement air.
　　 When you enter the glove box, step on the pressure-reducing pedal while slowly reaching into your arm.
　　 Similarly, when you come out of the glove box, you have to take it slowly. "
　　 Xu Qiu demonstrated twice in slow motion and asked: "Have you learned it?"
　　 "Learned, brother, let me come." Han Jiaying nodded and said.
　　 She moved slowly, but there was no problem. Both hands reached into the box.
　　 Xu Qiu stood behind the school girl and looked at her.
　　Han Jiaying is about 165 in height, but is about the same as Chen Wanqing. The two are similar in figure, but they can be distinguished from the hairstyle. The former has a double ponytail and the latter is a long and straight black.
　　 When doing the experiment, the black long straight must be tied up, otherwise there may be a safety hazard, and the double pony tail will not have so much trouble.
　　 Next, Xu Qiu gave her a detailed introduction to the working principle of the glove box, how to use the transmission cabin and the control panel, etc.
　　At this time, the ultrasonic cleaner stopped again.
　　 Han Jiaying came out of the glove box with a bit of reluctance, and said: "I'm going to deal with the substrate~EbookFREE.me~Xu Qiu has nothing to do, so she simply walked to her side and watched her experiment.
　　 Han Jiaying seemed a little nervous, but when she found him standing next to her, she became even more nervous.
　　 Under the double stimulation, the first substrate she picked up was blown away by the airflow from the nitrogen gun.
　　 She glanced at Xu Qiu with some embarrassment. Seeing that he didn't mean to blame, she bent over to pick up the substrate and put it into the old substrate box.
　　 Xu Qiu handed her a pair of tweezers and said, "This kind of flat tweezers are better for holding the substrate. You can try it."
　　 Han Jiaying tried, and said with emotion: "Really."
　　 Xu Qiu originally planned to ask, "Did she not teach you Chen Wanqing?" But then I thought of her teaching herself at the time, often missing key points.
　　 In terms of experimental operation, I mainly rely on imitating system images by myself and constantly exploring, which can be regarded as a lot of detours.
　　 It seems that this school girl still has to guide herself, she is a little unreliable.
　　……
　　 After cleaning the substrate, Xu Qiu continued the experiment, spin-coated zinc oxide, spin-coated the effective layer, evaporated and tested.
　　 He explained while operating.
　　Han Jiaying seemed to discover later that the brother Xu Qiu was more responsible and easier to talk.
　　 was no longer as restrained as it was at the beginning, and started to chirping non-stop.
　　 "Why is there a transport layer?"
　　 "Why heat annealing?"
　　 "Why is the rate of vapor deposition of metal electrodes so fast, while molybdenum trioxide is slower?"
　　 Xu Qiu was not impatient either, and solved the puzzles for the school girls one by one.
　　 Finally, the highest efficiency of this batch of devices reached 9.23%.
　　 The results were just right, and Xu Qiu was very satisfied.