Chapter 240: Teacher Wei's changes

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Xu Qiu's method is to dissolve the solvent additives in the main solvent chloroform to obtain a mixed solvent, and then add the mixed solvent to the effective layer solution.
For example, 900 microliters of chloroform can be mixed with 100 microliters to prepare a mixed solvent of 9:1 chloroform.
Then, in 1 ml of the effective layer solution, add 40 microliters of mixed solvent.
This is equivalent to about 1.04 ml of solution, containing 4 microliters, and the calculated volume fraction is about 0.38%.
Although it is not 0.4%, it is at least an accurate value.
Moreover, this approach does not involve the whole process of measuring less than 20 microliters of liquid, and the error of the pipette will be greatly reduced, because when measuring more than 20 microliters of solution, a piston-type pipette can be used Head, almost no solution remains, the same is true for high viscosity solutions.
Naturally, there are disadvantages. The mixed solvent contains chloroform as the main solvent, which will slightly dilute the concentration of the original solution.
If you want to pursue perfection, you need a lot of calculations to plan the concentration of the original solution and the amount of mixed solvent added.
Similarly, the effect of this problem can also be reduced by reducing the blending ratio of chloroform.
For example, to prepare a 4:1 chloroform mixed solvent, 1 ml of the effective layer solution only needs to add 20 microliters of the mixed solvent to achieve an addition amount of about 0.39%, and the effect on the concentration of the original solution is almost negligible.
Obviously, the higher the proportion in the blended solution, the smaller the amount that needs to be added to achieve the same concentration.
This is a question of balance.
After much consideration, Xu Qiu decided to unify the experimental standards and set the new standard as "9:1 chloroform mixed solvent, the original solution concentration increased by 4%."
Doing so may not significantly improve the performance of the device, but it can at least avoid the occurrence of high-efficiency devices made in the simulation laboratory, but in reality, the situation cannot be repeated because of uncertain conditions.
Xu Qiu restarted the simulation laboratory II, referring to the new standard, and instructed the simulation experimenters to start optimizing the device processing conditions of the highest efficiency system for him and his schoolmates.
Monday morning.
Xu Qiu got new data. Based on his third-generation 8 series and the second-generation B4T-6 series 3D-PDI receptor devices of his school girl, the highest efficiencies were 7.50% and 6.58%, and the previous values ​​were 7.42% and 6.51. %.
"Improved by 0.08% and 0.07%, just so-so."
"However, no matter what, I have improved a lot, and I invested a few hundred points in it in vain."
Xu Qiu was not very surprised by this result. After all this optimization, the experimental conditions did not change much.
The increase in efficiency data is simply due to the increase in the number of experiments, and the data fluctuates closer to the boundary.
From a statistical point of view, the device efficiency generally presents a normal distribution. In theory, as long as there are enough experiments, even if the average value is only 7%, it may fluctuate to 8%, 9%, or 10%. Of course, the probability of reaching 9% and 10% may be close to 0, but there is still a chance of 8%.
Having said that, even if by luck, 8% is made in the simulation laboratory, it is meaningless.
Unless you can have the same luck in reality, it will be nothing more than spectacle.
After exiting the simulation laboratory, Xu Qiu took a brief wash, then went downstairs to Han Jiaying to pick up the school girl, walked around the playground a few times, then settled breakfast, and went to the first floor of the material together.
At 9:35, everyone was summoned to 218 by Teacher Wei.
Before the official start of the group meeting, Wei Xingsi said: "I'm going to Europe this Thursday. You may have heard about it. It lasts for a week. When I come back next week, I will mainly visit several places for exchanges and visits."
"During my absence, the laboratory will be handed over to Feifei Wu. Every day, she will summarize the texts of your main work and send them to me in a unified manner. You can also send me a message on WeChat if you have anything." After a pause, Wei Xingsi added:
"Also, if there are calls coming in from abroad during this period, remember not to hang up. Okay, the group will start. You will come first, Feifei Wu."
Last week, Feifei Wu’s "Calcium Chloride Additives" article has been published, and the target journal is CC. After that, she plans to return to her old business and write an overview of "Research Progress in Perovskite Thin Films and Single Crystals". Adv.Sci., Wiley’s new publication.
The positioning of this journal is similar to that of AM's sub-journals AEM and AFM, but the positioning is positioning. There are too many new journals published every year. Whether it can be achieved, the most important thing is the recognition of the entire academic circle.
Otherwise, they will randomly produce a few journals and claim to be the top journal of the CNS. If others don't buy it, they can only cheer themselves up and make themselves cute.
Duan Yun's work on "Silver Nanowire Doped PVDF Based Thermoelectric Devices" is basically completed. He is currently sorting out experimental data and intends to vote for Small under Wiley. His previous review was posted on Small.
Small is a good journal. The major category is TOP in the first area, and several small categories are mostly in the second area. Although it is not comparable to AM and AEM, it is still better than AELM and ACSAMI.
Tian Qing is now cooperating with Feifei Wu on the in-depth study of the "perovskite charge transport mechanism" and has made preliminary progress.
Halfway through, Wei Xingsi mentioned something about "perovskite quantum dots." Tian Qing didn't respond positively to him, saying "I don't care, I just don't do it."
Teacher Wei made a stern face and seemed a little unhappy, but in the end he didn't say much.
According to Xu Qiu's current understanding of him, Teacher Wei is sluggish, and there is no way Tian Qing can be helped.
On the one hand, she is only a master's student and cannot use the article to entrap her; on the other hand, her parents are both locals in the magic city, so if you are really in a hurry, you can directly call her dad and mom to come over.
Of course, Tian Qing is not completely paddling, and she has done a good job of theoretical research that she likes to do.
She is now in the first year of graduate school and has already had an article. After that, the work on hand has produced results, and she can add another article. At least it is a total. It is conservatively estimated that it has surpassed more than 90% of the students.
Next, it was Sun Wo's turn.
He has been in the research group for three weeks and has basically learned the whole process of device preparation. Last week, he prepared several batches of tin-based perovskite devices.
However, when Xu Qiu saw his PPT, it didn't seem to be going well...
"What about efficiency, why is there only molecular structure listed in the table?" Wei Xingsi frowned while looking at the projection screen.
"There is no...efficiency." Sun Wo whispered.
"No efficiency, less than 1%?" Wei Xingsi asked.
"No, um, yes, the efficiency is all 0." Sun Wo lowered his head and said in a panic.
"Well, that means the device is not working." Wei Xingsi leaned forward behind the chair and said, "Wu Feifei, can you help me see it? What's the reason?"
"Um..." Wu Feifei paused, and said, "The film is very poor in appearance, which may be caused by this."
"The appearance is very poor, so don't make the device. Make the film first. When will you get a smooth and flat film, then make the device?" Wei Xingsi tapped the table lightly, increasing the sound, and said, "You know? ?"
"I see." Sun Wo and Wu Feifei responded.
"Okay, let's talk about it next." Wei Xingsi said lightly.
Chen Wanqing saw the result of Sun Wo, and she was a little gloat in her heart.'Finally there is a brother like me, and he is worse than me, hahaha', but seeing Teacher Wei’s attitude, she instantly wilted. .
She first carefully reported the device efficiency of C4 last week, which reached more than 1%, and put forward new experimental ideas.
Although Wei Xingsi didn't have a good face, he didn't make her too harsh. He just replied a few times and finally said, "This synthesis route looks better than before. Have you discussed it with Xu Qiu?"
After getting a positive answer, Wei Xingsi nodded.
In the end, it was Xu Qiu and Han Jiaying's turn to appear, and they respectively reported the progress of the device last week.
Hearing that Xu Qiu had reached an efficiency of about 6.5%, Wei Xingsi quickly burst into a smile and asked, "Is there any chance to do higher, above 7%?"
"High probability." Xu Qiu responded.
"Yes, keep going." Teacher Wei nodded and encouraged, and then when he learned that Han Jiaying's system had also broken through 6%, he stood up excitedly and said with satisfaction:
"Okay, very good. During this time, you will focus on optimizing devices and try out a few more batches. You can decide the specific division of labor yourself."
After everyone reported, Wei Xingsi sat back at his desk, switched back to a serious face, and said:
"One last time~EbookFREE.me~ After I leave this week, the laboratory will operate normally. When I come back I will check the progress of your experiments, especially Tian Qing, Sun Wo and Chen Wanqing."
After speaking, he breathed a sigh of relief, "Wu Feifei, you can order dinner, I won't eat at noon."
Everyone returned 216 thoughtfully.
Xu Qiu is not difficult to understand the changes in the weather of Teacher Wei at the group meeting.
He was mainly afraid that during the period of going abroad, the students in the group paddled a lot and didn't work, so he beat him.
In fact, for scientific researchers of age like Wei Xingsi, success or failure of experiments has long been commonplace.
The students will not knock on the table with anger when the experiment fails, and get excited when the experiment progresses. The exaggerated expressions in group meetings are more often just used to play the role of a mentor.
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