Chapter 215: You did it on purpose

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The new week comes, the group will meet.
Wu Feifei and Duan Yun each advanced the progress of the experiment a bit, and of course they are also "some", but there are still differences.
The former is that the core data has been obtained, and other representations are being added, and you can start writing articles. Although it is likely to be the second area of ​​the article, it is also SCI, and the latter is really a literal advancement...
Tian Qing talked about her work plan. She is going to Zhang Jiang laboratory to synthesize the first batch of perovskite quantum dots this week.
Sun Wo made a document report and saw that he was a little nervous and stumbling, but everyone was very tolerant. After all, everyone was slowly trained from novice speeches. No one was born to be a speech genius, who can talk to the group. Confucianism.
Wei Xingsi was also very amiable and encouraged Sun Wo a few words.
Xu Qiu remembered that when he first joined the research group, Teacher Wei seemed to treat him like this.
Then, Chen Wanqing reported with a PPT: "In the past two weeks, I synthesized a non-fullerene receptor of the ADA type called C1. I have obtained 80 mg of the product. The product is a purple-black solid powder. The purity is good.
The basic characterization of materials such as nuclear magnetism and elemental analysis has not been done yet. I plan to send samples for testing this week. Currently, only the UV-vis light absorption spectrum has been tested, and the light absorption range of the material is roughly 500-700 nm. "
"The device hasn't come in time to do it," Wei Xingsi paused and asked, "What do you think of the photoelectric performance?"
This is what he is most concerned about. Most of the research work is result-oriented. If a lot of energy is spent, the performance of the final material is in a mess, it is almost meaningless.
Efforts but no gains are the norm in scientific research.
"I don't know," Chen Wanqing shook her head, and when she saw Teacher Wei staring at her, she tentatively said: "Estimated 1%-2%?"
"Well, let's take a look at the batch of devices today." Wei Xingsi said lightly, seemingly disappointed.
Xu Qiu was sitting next to him, he wanted to cut in, "Senior sister, you are too optimistic", but looking at the current atmosphere, he still held back.
He suddenly remembered that the senior sister used to have such a time, the device efficiency was always below 1%, and the experiment failed. Is this going to repeat the same mistake?
Hey, let's find an opportunity to help her.
Next, Xu Qiu reported on his and Han Jiaying's results in the past two weeks, as well as the experimental plan this week.
"Starting this week, I intend to synthesize two 3D-PDI molecules, the first is the PDI3-B series, the other is the PDI3-B3T, PDI4-B4T series..."
These two series are the top two selected by Xu Qiu in order of priority among the dozens of feasible solutions previously listed.
Of course, this is only his subjective ranking, and the ranking basis is relatively rough. For example, whether the molecular structure is pleasing to the eye takes a lot of ranking weight.
Therefore, a higher ranking does not necessarily mean better device performance.
Xu Qiu plans to personally take charge of the PDI3-B series.
It can be called one of the simplest 3D-PDI molecules, the molecular structure is a benzene ring in the middle, and then three PDI molecules.
As for why the thiophene ring is not used, because the benzene ring is a six-membered ring, it is easy to form a symmetric structure, while the thiophene ring is a five-membered ring. Generally, it must be attached to the benzene ring during the introduction process. Otherwise, if the molecule is asymmetric, it will be synthesized The difficulty will be greatly increased.
The simple molecular structure of this series means that the corresponding synthesis reaction is relatively easy to carry out, and the subsequent operation space is large.
Xu Qiu didn't expect to get into the soul, first lay the foundation, and then continue to improve in the future, just like the original PCE11 was optimized step by step from PBT4T.
Moreover, today he is not the comparable scientific researcher of the past, he has a lot of scientific research experience, and the improvement plan has already taken shape in his mind.
The other PDI3-B3T and PDI4-B4T series are actually the ideas proposed by the school girl before. There is a benzene ring in the center, three or four thiophene rings connected to it, and then PDI molecules. Now it happens to be handed over to her.
Originally, this idea was ranked fourth among the dozens of feasible solutions, but due to the bonus of "proactively proposed by a school girl", the priority instantly jumped to second.
Yes, it's so casual...
After listening to Xu Qiu's report, Wei Xingsi nodded, "Yes, just follow these two routes to synthesize." After a pause, he added: "Try to achieve 8% or 9% efficiency!"
Xu Qiu smiled and did not respond.
The goal given by Mr. Wei is to break the world record. The highest efficiency of the PDI series is only 8%, which is still a little far away for him who has just started.
He probably understands Mr. Wei’s thoughts. In fact, the two synthetic routes he proposed are not terrifying, nor are they in-depth. The main reason should be the optoelectronic performance data just reported, based on PCE10:PBI-5 devices. The efficiency reached 5.21%.
This value is higher than the highest efficiency of Teacher Wei doing PDI research in Beautiful Country, when they were only 4%.
Although this field has developed in the past few years, Xu Qiu's first report is so impressive. Coupled with his historical performance, it is not surprising that Teacher Wei has such expectations.
Xu Qiu didn't go far ahead. He set his goals at 6% and 7% temporarily.
At the beginning, I set foot in 3D-PDI mainly to sell a 3D concept, while honing my ability in organic synthesis, and then transforming into higher potential A-D-A molecules.
But the plan couldn't keep up with the changes. On the one hand, the concept was robbed by others. On the other hand, the C1 molecule synthesized by the senior sister was open to the door.
This made Xu Qiu a little skeptical of his own judgment, but he quickly adjusted his mentality. No matter what the future says, he still has to do a good job of 3D-PDI now, at least to make a complete system.
...
After the group meeting, everyone returned to 216.
Xu Qiu carried the folding stool and walked in front, planning to open the door with a card.
At this moment, Han Jiaying suddenly appeared next to him, grabbed his sleeves, and said eagerly: "Brother, I just mentioned casually at the time. Why did I say it at the group meeting? I'm not ready yet. , I think this week I will mainly do device and characterization in Handan. I feel that the system performance of PBI-5 has room for further improvement."
Xu Qiu had anticipated this and responded: "The PBI-5 system is not in a hurry. The system that has been reported, no matter how efficient we are, we can only use it as a standard sample."
"However, I haven't designed the synthetic route yet." Han Jiaying said again.
Xu Qiu smiled, "It's a rare school girl that you mentioned an idea, I have already closed it for you, the feasibility is still good, I have also helped you plan the specific synthesis route."
"Really, that's great," Han Jiaying smiled, and then suddenly thought of something, "I read the JACS review before, and it seems to use borated raw materials. We haven't touched this before. "
"Well, this is indeed a new reaction." While speaking, Xu Qiu had already opened the door of the laboratory. He put down the round stool, returned to his seat, awakened the laptop in standby mode, and pointed to the information summarized on the PPT. , Explained:
"One of the raw materials used in our synthesis reaction is PDI-Br substituted with monobromo, which is available.
However, only 500 mg of PDI raw material was used before and reacted with liquid bromine. The yield of PDI-Br was about 200-300 mg. However, each raw material used to synthesize PDI dimer last time consumed 100 mg, so now only left A little over 100 mg is only enough for one reaction.
Another reaction raw material is the central core unit borated, such as my 1,3,5 triborate benzene, and your tetraborate substituted TTB. "
Han Jiaying stared at the computer screen carefully, frowning slightly, "It looks like the structure of borate ester is so complicated. Will this reaction be difficult?"
"The Suzuki coupling reaction similar to the Stille coupling reaction is used. The condensation reaction of the bromine group and the borate ester forms a carbon-carbon single bond at the junction." Xu Qiu explained:
"In terms of difficulty, the new reaction may be slightly more difficult than the Stille coupling reaction, but it is not too exaggerated."
"Um...that's good." Han Jiaying breathed a sigh of relief.
When the school girl was halfway out of her breath, Xu Qiu suddenly said, "But..."
Han Jiaying was suffocated, her face flushed, and she was out of breath: "Brother, can you finish it in one breath."
Xu Qiu smiled secretly in his heart, but the surface was calm, UU Reading www.uukanshu.com "But the structure of the material you designed is more complex, and the corresponding borate ester substitutions are not directly commercially available for purchase, and they need to be synthesized by themselves."
After that, he didn't tease the school girl anymore, and he said, "I have planned the synthesis route for you."
The first step starts with the first 1,3,5-tribromobenzene and 1,2,4,5-tetrabromobenzene, and reacts with trimethyltin-substituted thiophene respectively to obtain the middle nuclear unit;
In the second step, the smooth core unit reacts with p-diborate to obtain the borated core unit;
In the third step, the borated core unit undergoes Suzuki coupling reaction with PDI-Br to obtain 3D-PDI molecules. "
"This, this, and this..." Han Jiaying nodded thoughtfully, and she quickly understood the language and the introduction of the picture. "It doesn't seem to be difficult. By the way, what about the initial raw materials? catalyst."
"Don't worry about my affairs. The medicines and catalysts were bought last Tuesday. They have arrived and are stored in the Zhangjiang Pharmaceutical Warehouse." Xu Qiu said.
"Um... it seems that there is nothing wrong." Han Jiaying tilted her head and thought for a while. It seemed that everything was ready, but there was always something wrong.
...
In the afternoon, Chen Wanqing stayed in Handan to make devices, and Xu Qiu took Han Jiaying to Zhangjiang laboratory.
In the A501 office, Han Jiaying makes preparations before the reaction, operates the computer, and calculates the feeding quality.
When she saw the raw material of Xu Qiu's reaction, she finally understood what was wrong, "Brother, why is there only one step in your reaction?"
"Of course it's because my raw materials are simple, and I can buy them directly. I can do it in one step, envy it." Xu Qiu triumphed.
"You did it on purpose." Han Jiaying gritted her teeth.