Chapter 192: Interesting reviewer

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"You can see it, Teacher Wei mainly picked this problem." Chen Wanqing sighed and said:
"The D and A units of the ADA molecules I designed are relatively small. They must be synthesized from raw materials. Unlike the DA copolymer donors, most of the D and A unit monomers can be directly derived from optoelectronic materials. The company buys it directly, and then gets the monomer directly for polymerization."
"Um..." Xu Qiushen nodded in agreement, and then added:
"At the time, I was more inclined to start with PDI molecules, and I also had this consideration. After all, I had only done Stille coupling reactions before. Although I had also taken courses and experimental courses on "Organic Synthesis", I did not have much practical experience. .
Compared with the ADA molecule, the PDI molecule has a single molecular structure, and there are fewer types of organic synthesis involved. As long as you master two or three types of reactions, such as the substitution reaction of bromine and the condensation reaction of amino and carboxyl groups, most molecular structure designs can be realized. , It's perfect to practice hands. "
Chen Wanqing glared at him, "You know, why didn't you tell me then?"
"You didn't ask either..." Xu Qiu saw that she seemed to have signs of hands-on, and she hurriedly changed the subject: "Why do you come and do PDI with me?"
As soon as the voice fell, he received a left uppercut.
"I don't believe that I can't do it. Recently, I checked a lot of information, and now the newly designed synthetic route has been completed." Chen Wanqing was still sulky.
She jumped the PPT to a new page: "Here, you look at it again."
"Four, seven, nine, eleven-step synthesis reactions? So many steps? Senior sister, are you serious?" Xu Qiu was surprised. If there are many reaction steps, the final yield will be very low and accidents are more likely to occur. Anyway, he didn't have the courage to challenge such a high degree of difficulty.
"Of course it's serious, why, do you have an opinion?" Chen Wanqing said in a bad mood.
"No, no." Xu Qiu waved his hand, thinking,'Senior sister now has enough articles for her to graduate. If you want to toss, let her go. If you force her to persuade her, she will probably not be able to come back. It's not too late to persuade, anyway, at most wasting some time'.
With this idea, he once again looked at the other parts of the senior sister's PPT. In addition to material synthesis, she also mentioned three aspects: light absorption, energy level matching, and blending morphology.
After a while, Xu Qiu asked again: "Why limit the light absorption range of the acceptor material to 400-800 nanometers?"
"Coincidentally, Teacher Wei asked me this question at the time," Chen Wanqing explained: "His suggestion is to start with non-fullerene materials with a wide band gap that absorbs 400-600 nanometers.
Because it can complement the light absorption of PCE10, the best donor material at this stage, and your PCE11, you know that the latter two are materials with a narrow band gap, and the light absorption range is about 600-800 nanometers.
However, in principle, he did not oppose me to continue to be a narrow band gap receptor, and he encouraged me to work towards the diversity of molecular structure and develop some molecules that are different from the existing system. . "
"Well, I can understand him when he said that. After all, he has studied the PDI system for many years. When encountering a new system like ADA, it is easy to substitute some research ideas of the original system into it." Xu Qiu nodded. .
"So, do you agree with me more?" Chen Wanqing tilted her head.
"No, I don't agree with either of you." Xu Qiu shook his head: "I think it can be more radical and widen the band edge of non-fullerene acceptor materials to 900 or even 1000 nanometers."
"Is this not feasible?" Chen Wanqing retorted subconsciously: "Really make the band gap of the material so small. When converted into the band gap, it is only 1.2-1.4 eV. Isn't the device open circuit voltage only 0.4 or 0.5 volts? ."
"Based on the theory of fullerene derivatives, this is true, but the structure of non-fullerenes and the spherical structure of fullerenes are completely different, and there are few researches on the mechanism at this stage, and they are not necessarily applicable to the same Theory." Xu Qiu further explained:
"If we stand at a higher level, jump out of the framework of the traditional fullerene system, and directly follow the Shockley-Quisel limit, we will find that the upper limit of the photoelectric conversion efficiency under the wide band gap is much lower than that of the narrow band gap.
The extreme point, at 1.2-1.4 electron volts, also corresponds to the 900-1000 nanometer absorption band edge. "
Seeing the senior sister lost in thought, Xu Qiu continued:
"I think that narrowing the band gap of materials, like silicon materials, is the way out for the organic photovoltaic field in the future.
You can't always expect the efficiency of organic photovoltaic materials to be only 10-12%. This is a device made under the conditions of a laboratory, no water, no oxygen, and a small area.
If applied, facing the conditions of factory production, air preparation, large area, and long-term use, the efficiency of the device may only be 5%.
Of course, the road has to be walked step by step, and there is no rush to get it in place. We can slowly choose an entry point to start the experiment first, and then slowly figure it out, but we cannot be constrained by the existing framework. "
"I understand," Chen Wanqing nodded slowly: "I will consider this when designing new molecules later."
"One thousand words, ten thousand words, now it's all on paper, the senior sister first synthesizes a molecule and then talks..."
When Xu Qiu finished speaking, he received another right uppercut.
"If you can talk, just say a little bit more," Chen Wan said innocently. "That's right, do you still insist on doing PDI afterwards? Isn't that also broadband gap?"
"Actually, I discussed it with you and helped me straighten out my thinking. When I put forward my research ideas before the holiday, I didn't think so far-reaching." Xu Qiu scratched his head and said:
"But I think the idea of ​​PDI is very feasible, and I am not willing to give up. Anyway, some seniors will find the way first, and then I will prepare to hug your thighs."
Chen Wanqing gave a hum, and then suddenly asked: "By the way, have you bought your medicine?"
"I bought it, I bought it before the holiday," Xu Qiu gestured with his fingers: "Including the initial raw material of PDI, perylene tetracarboxylic dianhydride, various amines, and elemental bromine. These are common industries. The raw materials can be bought directly on the website of hazardous chemicals, and then I can directly condense and get the perylene diimide I need, and furthermore..."
"Hey," Chen Wanqing sighed, "If I had planned the synthesis route before the holiday, it wouldn't be so troublesome now. The medicine has just been ordered and it is estimated that it will take more than a week to start the experiment."
"It doesn't matter, senior sister can take this opportunity to write more reviews." Xu Qiu smiled.
"You will arrange things for people, but you are ranked first in the summary."
"What's the relationship between the two of us? If you want one, I will give it to you."
"I'm just kidding. If the medicine doesn't arrive, I will write a summary first and pass the time."
Today is Friday. In the evening, Xu Qiu worked overtime with Teacher Wei and Jiaying Han to drop articles.
At this point, after Xu Qiu came back from the holiday, the two matters of the senior sister and senior sister were all over.
...
Sunday afternoon.
Originally, Xu Qiu's plan was to go to Zhang Jiang's laboratory today and test the water with a simple PDI synthesis reaction.
As a result, he took Han Jiaying happily to the place where the school bus was waiting, only to find that there was no school bus to Zhangjiang today.
It turns out that during the holidays, there are only shuttle buses on Saturday and Sunday two weeks before school starts, and there are not many trains.
Today is just the last day of the three weeks before school starts...
He didn't want to spend three hours commuting back and forth on rail transit, or spending more than a hundred dollars in taxis, so he returned to the laboratory with his schoolgirls.
Xu Qiu was sitting at the desk, thinking about what to do today. When he wanted to paddle, there was the sound of "Da Da Da" footsteps in the corridor.
Everyone showed serious research in an instant.
Wei Xingsi quickly appeared at the door. He looked around in the laboratory, then smiled and said to Xu Qiu and Chen Wanqing:
"There are two things, one is your review, the ACSEnergyLetter editor agreed to submit the manuscript, and you can start writing.
Of course, the review is not in a hurry. You can write it slowly. The main thing is to do the experiment. It can be completed in the interval between the experiments. The editor and I will take two months and give you one month to complete the first draft. Then we Change it again. "
"Okay." The two nodded in response.
Xu Qiu thought secretly in her heart,'Finally, this review was voted into a new journal, and it must not be used to complete system tasks~EbookFREE.me~ After all, the new journal will have to wait two or three years for the impact factor to be published, and then it will be divided into sections. The dishes are cold. ’
"The other one is that there is an article to be reviewed and it has been forwarded to your mailbox. Take a look. This article is very interesting." Wei Xingsi left this sentence and turned and left.
"Interesting?" Xu Qiu and Chen Wanqing looked at each other, and Han Jiaying was also attracted.
Xu Qiu uses his computer to click on the email, download the attachment, and open the file.
"Well, the journal is JACS..." he muttered as he read it.
JACS is the top journal in chemistry, and the same level as the German application. As for how its status compares with AM, different people have different opinions. Some say that the two are equivalent, and some say that an AM has two articles. JACS.
"Title, "A high-performance, highly crystalline polymer donor material used in organic solar cells with an efficiency of over 10%""
It wouldn't be so coincidental. Seeing this, Xu Qiu showed an inexplicable smile. He immediately flipped down and went directly to the picture of molecular structure.
Han Jiaying glanced at the structural formula, and immediately reacted, and said in surprise: "Isn't this the PCE11 made by brother, it seems exactly the same."
"Yes," Xu Qiu nodded and said, "It's just that they named PffBT4T-2OD, which is slightly different from mine."
"Fortunately, we acted faster," Chen Wanqing said with a sigh of relief, "Look at their highest efficiency?"
"Not very high, only 10.16%." Xu Qiu said, when he crossed the abstract of the article before, the efficiency data flashed by, but he still remembered it.
"What do you think of this review?" Han Jiaying asked curiously.
"I can only... refuse."