I Have a Research Support System

A new week is coming, group meeting.

Wu Feifei and Duan Yun each advanced the progress of the experiment a little bit, of course the same "some", there is still a difference.

The former means that the core data has been obtained, and other characterizations are being supplemented, and you can start writing articles. Although there is a high probability that the article is in the second district, it is also an SCI, and the latter is really a literal advancement...

Tian Qing talked about her work plan. This week, she plans to synthesize the first batch of perovskite quantum dots in Zhang Jiang's laboratory.

Sun Wo made a literature report, and he could see that he was a little nervous and stuttering, but everyone was very tolerant. After all, everyone was trained slowly from a novice speaker. Confucianism.

Wei Xingsi also acted very kindly, and encouraged Sun Wo a few words.

Xu Qiu thought 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 have synthesized an A-D-A type non-fullerene acceptor named C1, and I have obtained 80 mg of the product so far. The product is a purple-black solid powder. The purity is good.

The basic characterization of the material such as NMR and elemental analysis has not yet been done. I plan to send samples for testing this week. At present, I have only tested the UV-vis light absorption spectrum, and the light absorption range of the material is roughly 500-700 nanometers. "

"The device hasn't arrived yet." Wei Xingsi paused and asked, "How do you estimate the photoelectric performance?"

This is what he is most concerned about. Most of the scientific research work is result-oriented. If a lot of energy is spent and the performance of the material is poor in the end, it is almost meaningless.

It is normal in scientific research work to work hard but not gain.

"I don't know," Chen Wanqing shook her head, saw Teacher Wei staring at her, and asked tentatively, "I guess 1%-2%?"

"Well, let's make a batch of devices today." Wei Xingsi said lightly, seeming a little disappointed.

Xu Qiu was sitting next to him, and he really wanted to interject, "Sister, you are too optimistic", but looking at the current atmosphere, he held back.

He suddenly remembered that senior sister once had such a period of time, the device efficiency was always lower than 1%, and the experimental pattern failed. Is this going to repeat the same mistakes?

Hey, let's find a chance to help her.

Next, Xu Qiu reported his and Han Jiaying's achievements in the past two weeks, as well as the experimental plan for this week.

"Starting this week, I plan to synthesize two 3D-PDI molecules. The first is the PDI3-B series, and the other is the PDI3-B3T, PDI4-B4T series..."

These two series are the top two selected by Xu Qiu in order of priority from the dozens of feasible plans listed before.

Of course, this is just his subjective sorting, and the sorting basis is relatively rough. For example, whether the molecular structure is pleasing to the eye occupies a large ranking weight.

Therefore, the top ranking does not necessarily mean that the performance of the device is good.

Xu Qiu plans to take charge of the PDI3-B series.

It can be called one of the 3D-PDI molecules with the simplest structure. The molecular structure is a benzene ring in the middle, and then three PDI molecules outside.

As for why the thiophene ring is not used, because the benzene ring is a six-membered ring, it is easy to form a symmetrical structure, and the thiophene ring is a five-membered ring, which is generally attached to the benzene ring during the introduction process. Otherwise, if the molecule is asymmetric, the synthesized The difficulty will be greatly increased.

The molecular structure of this series is simple, which means that the corresponding synthesis reaction is relatively easy to carry out, and there is a large space for subsequent operations.

Xu Qiu doesn't expect to hit the soul right away, lay the foundation first, and continue to improve in the future, just like the original PCE11 was obtained from the step-by-step optimization of PBT4T.

What's more, he is not the same scientific research rookie as he used to be. He has a lot of scientific research experience, and the improvement plan has already taken shape in his mind.

In addition, the 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 on the outside, and then PDI molecules, which are now in charge of her.

Originally, this idea was ranked fourth among the dozen or so possible solutions, but due to the addition of "the school girl proposed it on its own initiative", the priority instantly jumped to the second place.

That's right, it's that random...

After listening to Xu Qiu's report, Wei Xingsi nodded, "That's right, let's combine these two routes." After a pause, he added: "Strive to achieve an efficiency of 8% or 9%!"

Xu Qiu smiled, but did not respond.

The goal given by Mr. Wei is to break the world record. Now the highest efficiency of the PDI series is only 8%, which is still a bit far for him who has just started.

He can probably understand Mr. Wei's thoughts. In fact, the two synthesis routes he proposed are not so shocking, nor did they go into depth. The main reason should be the photoelectric performance data just reported, based on the PCE10:PBI-5 device. The efficiency reached 5.21%.

This value is higher than the highest efficiency of Mr. Wei when he was doing PDI research in the beautiful country. At that time, they were only 4%.

Although this field has developed over the past few years, but the results of Xu Qiu's first report are so impressive, coupled with his historical performance, it is not surprising that Teacher Wei has such expectations.

Xu Qiu didn't aim too high, he set his goal at 6% or 7% for the time being.

The main purpose of getting involved in 3D-PDI was to sell a 3D concept, and at the same time hone the ability of organic synthesis, and then transform to A-D-A molecules with higher potential.

But the plan couldn't keep up with the changes. On the one hand, the concept was snatched away, and on the other hand, the C1 molecule synthesized by the senior sister was a bad start, and the efficiency was less than 1%.

This made Xu Qiu doubt his own judgment, but he quickly adjusted his mentality. No matter what the future says, he still needs to do a good job of 3D-PDI now, at least to create a complete system.

...

After the group meeting, everyone returned to 216.

Xu Qiu carried a foldable round stool and walked in front, intending to use his card to open the gate.

At this time, Han Jiaying suddenly appeared from beside him, grabbed his sleeve, and said eagerly: "Brother, I just mentioned it casually, why did I mention it in the group meeting, I'm not ready yet , I think this week I will mainly do devices and characterization here in Handan, and I feel that there is still room for further improvement in the performance of the PBI-5 system."

Xu Qiu had expected this for a long time, and responded: "The PBI-5 system is not in a hurry. The system that has been reported, no matter how efficient we make it, it can only be used as a standard sample."

"But, I haven't designed the synthesis route yet," Han Jiaying said again.

Xu Qiu smiled, "It's rare for you to come up with an idea, junior girl. I've checked it out for you. The feasibility is good. I've also planned the specific synthesis route for you."

"Really, that's great," Han Jiaying's face brightened, and then she suddenly thought of something, "I read the JACS review before, and it seems to use boronized raw materials, which we haven't touched 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, woke up the laptop in standby mode, and pointed to the information summarized on the PPT. , explaining:

"One of the raw materials used in our synthesis reaction is monobromo-substituted PDI-Br, which is existing.

However, only 500 mg of PDI raw material was cast before, reacted with liquid bromine, and the output of PDI-Br obtained was about 200-300 mg, while the last synthesis of PDI dimer consumed 100 mg of each raw material, so now only A little over 100 mg is only enough for one reaction.

Another reaction raw material is the central core unit of boronate esterification, such as my 1,3,5 triborate substituted benzene, or your tetraboronate substituted TTB. "

Han Jiaying stared at the computer screen carefully, frowning slightly, "It seems that the structure of boric acid ester is very 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 boronic acid ester forms a carbon-carbon single bond at the connection." Xu Qiu explained:

"In terms of difficulty, the new reaction may be slightly more difficult than the Stille coupling reaction, but it will not be too exaggerated."

"Well...that's good." Han Jiaying breathed a sigh of relief.

The moment the junior girl exhaled halfway, Xu Qiu suddenly said: "But..."

Han Jiaying was held back for a moment, her face turned red, and she said angrily, "Senior brother, can you finish speaking in one breath."

Xu Qiu secretly smiled inwardly, but his expression remained calm, "But the structure of the material you designed is relatively complex, and there is no direct commercial channel to purchase the corresponding borate ester substitutes, so you need to synthesize them yourself."

Afterwards, he didn't tease the schoolgirl any more, and just said it all at once: "I've already planned the synthesis route for you.

The first step starts from the initial 1,3,5-tribromobenzene and 1,2,4,5-tetrabromobenzene, and reacts with trimethyltin-substituted thiophene to obtain the intermediate nuclear unit;

In the second step, the smooth nuclear unit reacts with p-diboronate to obtain a boronated nuclear unit;

In the third step, a Suzuki coupling reaction occurs between the borated core units and PDI-Br to obtain 3D-PDI molecules. "

"This way, this way, this way..." Han Jiaying nodded thoughtfully, she quickly understood the language and the introduction of the pictures, "It doesn't seem to be very difficult, by the way, what about the initial raw materials, and catalyst."

"Don't worry about my work. The medicines and catalysts were bought last Tuesday, and they have arrived and are stored in Zhangjiang's medicine warehouse," Xu Qiu said.

"Hmm... It seems there's nothing wrong with it." Han Jiaying tilted her head and thought for a while, it seemed that everything had been prepared, but she always felt that something was wrong.

...

In the afternoon, Chen Wanqing stayed in Handan to make devices, and Xu Qiu took Han Jiaying to Zhangjiang's laboratory.

In the A501 office, Han Jiaying was making preparations before the reaction, operating the computer, and calculating the quality of the feed.

When she saw the raw material of Xu Qiu's reaction, she finally understood what was wrong, "Brother, why is your reaction only one step?"

"Of course it's because my raw materials are simple and I can buy them directly. I can do it in one step. Be envious." Xu Qiu was triumphant.

"You did it on purpose." Han Jiaying gritted her teeth.