I Have a Research Support System

You can tell, Teacher Wei is mainly picking on this problem. Chen Wanqing sighed and said:

The D and A units of the A-D-A molecules I designed are relatively small and must be synthesized from raw materials. Unlike D-A copolymer donors, most of the D and A unit monomers can be directly obtained from optoelectronic materials. The company buys directly, and then gets the monomers to do polymerization directly.”

Hmm... Xu Qiu nodded approvingly, and then added:

At that time, I was more inclined to start with PDI molecules, and I also had this consideration. After all, I only did Stille coupling reactions before. Although I also took the courses and experimental courses of Organic Synthesis, I didn't have much practical experience. .

Compared with A-D-A molecules, the molecular structure of PDI is single, and there are fewer types of organic synthesis involved in it. As long as you master two or three types of reactions, such as bromine substitution reactions, condensation reactions of amino and carboxyl groups, most molecular structure designs can be realized. , It's perfect for practicing.

Chen Wanqing glared at him, You know it all, why didn't you tell me then?

You didn't even ask... Seeing that she seemed to be doing something, Xu Qiu hurriedly changed the subject: Why don't you come and do PDI with me?

As soon as the words fell, he received a left uppercut.

I don't believe that I can't do it anymore. I have checked a lot of information recently, and now the newly designed synthesis route has been prepared. Chen Wanqing was still angry, still looking full of anger.

She jumped the PPT to a new page: Here, take a look again.

Four, seven, nine, eleven steps of synthetic reaction? So many steps? 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 difficulty when he came up.

Of course it's serious. Why, do you have an opinion? Chen Wanqing said angrily.

No, no. Xu Qiu waved his hand, thinking, Senior sister, the article is enough for her to graduate now, so let her go if you want to make a fuss. If you force her to persuade her now, she probably won't be able to persuade her back. When she hits a wall at that time, she will not come back. It's not too late to persuade, anyway, at most waste some time'.

With this in mind, he looked at the other parts of the sister's PPT again. 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 should the light absorption range of the acceptor material be limited to 400-800 nanometers?

Coincidentally, Teacher Wei also asked me this question at the time, Chen Wanqing explained: His suggestion is that it is more appropriate to start with non-fullerene materials with a wide bandgap that absorbs at 400-600 nanometers.

Because it can complement PCE10, the best donor material at this stage, and your PCE11 light absorption. As you know, the latter two are materials with narrow bandgap width, and the light absorption range is about 600-800 nanometers.

However, in principle, he did not object to my continuing to be a narrow-bandgap acceptor, and encouraged me to work towards the direction of molecular structure diversity, and to develop some different molecules that are different from the existing systems. .

Well, I can understand what he said. After all, he has studied the PDI system for many years. When encountering a new system like A-D-A, it is easy to substitute some research ideas of the original system. Xu Qiu nodded. .

So you agree with me more? Chen Wanqing tilted her head.

No, I disagree with both of you. Xu Qiu shook his head: I think it can be more radical and broaden the band edge of non-fullerene acceptor materials to 900 or even 1000 nanometers.

Is this not feasible? Chen Wanqing retorted subconsciously: If the bandgap width of the material is really made so small, it is only 1.2-1.4 electron volts when converted into a bandgap width. Isn't the open circuit voltage of the device only 0.4 or 0.5 volts? .”

Based on the theory of fullerene derivatives, it is true that the structure of non-fullerenes is completely different from the spherical structure of fullerenes, and there are few mechanistic studies at this stage, which may not necessarily apply to the same A 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-Queissel limit, we will find that the upper limit of the photoelectric conversion efficiency is much lower under the wide band gap than that of the narrow band gap.

And the extreme point, at 1.2-1.4 eV, also corresponds to the absorption band edge at 900-1000 nm.

Seeing that the senior was lost in thought, Xu Qiu continued:

I think that narrowing the bandgap width of materials to be on par with silicon materials is the way out for the future of organic photovoltaics.

You can't always expect the efficiency of organic photovoltaic materials to be only 10-12%. This is still a device made in the laboratory, under the conditions of no water and oxygen, and a small area.

If it is applied, the efficiency of the device may be only 5% in the face of factory production, preparation in the air, large area, and long-term use.

Of course, the road has to be taken step by step, and there is no rush to get it in place in one step. We can slowly choose a starting point to start experiments, and then gradually develop, but we should not be bound by the existing framework.

I understand. Chen Wanqing nodded slowly: I will consider this when designing new molecules in the future.

Say one thousand, say ten thousand, now it's all on paper, senior sister synthesizes a molecule first, let's talk...

Just as Xu Qiu finished speaking, he received another right uppercut.

If you can talk, talk more, Chen Wan gave him a clean look: By the way, will you continue to do PDI in the future? Isn't that also wide-bandgap?

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. Xu Qiu scratched his head and said:

However, I think the idea of ​​PDI is very feasible, and I'm not willing to give it up. Anyway, there is a senior to explore the way first, and then I'm going to hug your thigh.

Chen Wanqing hummed, and then suddenly asked, By the way, have you bought your medicine yet?

I bought it, I bought it before the holiday, Xu Qiu gestured with his fingers: Including perylenetetracarboxylic dianhydride, the initial raw material of PDI, various amines, and bromine elemental substances, which are commonly used in industrial The raw materials can be bought directly on the hazardous chemicals website, and then I can directly condense to get the required perylene diimide, and further...

Hey, Chen Wanqing sighed softly, If I had planned the synthesis route earlier before the holiday, I wouldn't be in such trouble now. I just placed an order for the medicine, and it may take more than a week before the experiment can start.

It's okay, senior sister can take this opportunity to write more summaries. Xu Qiu smiled.

You will arrange things for people, but you will be ranked first in the summary.

What's the relationship between us? If you want a work, I'll give it to you.

I'm just joking. If the medicine doesn't arrive, I'll write a review first. It's a good way to pass the time.

Today is Friday, and Xu Qiu worked overtime in the evening to drop the article together with Teacher Wei and Han Jiaying.

So far, after Xu Qiu came back from vacation, the two matters between the senior and the junior were all settled.

...

Sunday afternoon.

Originally, Xu Qiu's plan was to go to Zhang Jiang's laboratory today and try a simple PDI synthesis reaction.

In the end, he took Han Jiaying excitedly 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 buses on Saturdays and Sundays two weeks before the start of school, and there are not many buses.

Today just happens to be the last day of three weeks before school starts...

He didn't want to spend three hours commuting back and forth on the rail transit, or spend more than 100 yuan to take a taxi, so he took his junior girl back to the laboratory.

Xu Qiu was sitting at his desk, thinking about what to do today, whether he should go paddling, when the sound of da da da footsteps came from the corridor.

Everyone put on an appearance of serious scientific research in an instant.

Wei Xingsi quickly appeared at the door. He looked around the laboratory, then smiled and said to Xu Qiu and Chen Wanqing:

There are two things, one is your review, the editor of ACS Energy Letter agreed to submit it, 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, and finish it in the interval between experiments. The editor and I took two months, and I will give you one month to complete the first draft. Change it again.

Okay. The two nodded in response.

Xu Qiu thought to himself, 'In the end, this review was submitted to a new journal, and it must not be used to complete the system tasks. After all, the new journal will have to wait two or three years to publish its impact factor, and when it is published, the day lily will be cold. '

The other thing 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, then turned and left.

Interesting? Xu Qiu and Chen Wanqing looked at each other, and Han Jiaying was also attracted.

Xu Qiu opened the email on his computer, downloaded the attachment, and opened the file.

Well, the journal is JACS... he muttered while reading.

JACS is the top journal of chemistry, and there is German Yinghua at the same level. As for how its status compares with AM, different people have different opinions. Some say that the two are equivalent, and some say that one AM is better than two. JACS.

Title, 'A high-performance highly crystalline polymer donor material for organic solar cells with efficiencies above 10%'

It can't be such a coincidence. Seeing this, Xu Qiu showed an inexplicable smile, and he immediately scrolled down, directly to the picture of the molecular structure.

Han Jiaying glanced at the structural formula, and immediately reacted, and said in surprise: Isn't this the PCE11 made by senior brother, it seems exactly the same.

That's right, Xu Qiu nodded and said, It's just that they named it PffBT4T-2OD, which is slightly different from my naming method.

Fortunately, we moved faster, Chen Wanqing said with a sigh of relief, Let's see how efficient they are?

Not high, only 10.16%. Xu Qiu said, when he swiped over the article summary, the efficiency data flashed by, but he still remembered it.

What about the reviewers for this article? Han Jiaying asked curiously.

I can only... refuse.