I Have a Research Support System

After exchanging good mornings with his junior, Xu Qiu strolled to Caiyi.

The main reason for not going to Zhangjiang today is that on the one hand, there is a class meeting, and on the other hand, the school girl has accumulated a lot of products to be separated and purified. It will definitely take a whole day of liquid chromatography. After he passes by, he can only print Make soy sauce.

Arriving at 216 ten minutes earlier, there were only Chen Wanqing, Wu Feifei and Sun Wo in the office.

After saying hello to the friends, Xu Qiu sat next to the senior sister and asked casually, "How about the C1 device?"

"Hey, don't mention it, I made a batch, and the highest efficiency is only 0.89%." Chen Wanqing shook her head, not too frustrated, with a calm face, "I plan to make another batch today, if it doesn't work, I will try to optimize it again Molecular Structure."

"How much, 0.89%?" Xu Qiu was surprised. He remembered that the result after the first pass with Simulation Lab II was only 0.67%. ‘How did the senior sister manage to be higher than the system? Could it be that I remembered wrongly? '

"Less than 1%, it's indeed a bit lower, but you shouldn't be so surprised?" Chen Wanqing tilted her head, looked at Xu Qiu carefully, and seemed to say, "Little brother, you seem to have a problem with me?" ".

"No, that's not what I meant." Xu Qiu explained, then took out the water glass, "I'm going to get a glass of water."

"Your water glass is still full." Chen Wanqing complained.

"It's only half left now." Xu Qiu unscrewed the lid of the cup, took a big sip, and when the teeth were cold, he said, 'Oh, it's so cold. '

"Go, go." Chen Wanqing waved her hand. 'The younger brother is acting weird early in the morning, forget about him, and continue to follow the drama. '

Taking the opportunity of fetching water, Xu Qiu entered the simulation laboratory II and opened up the historical data.

Senior sister C1's system, the highest efficiency is 0.67%, that's right, what's wrong?

Xu Qiu murmured to himself, it couldn't be the senior sister who falsified the data.

He quickly ruled out this possibility. The efficiency is less than 1%, and it is not 10%. There is no point in falsification.

'The data can speak, let's look at the historical data on my side first. '

After a few minutes, Xu Qiu finally figured out the reason.

When he first started the simulation lab II for traversal, he provided the simulation lab personnel with the initial conditions of the PDI system.

The C1 material synthesized by the senior sister later has an A-D-A structure. The optimal conditions for the two are different, but the initial conditions have not changed.

Therefore, based on the initial conditions of PDI, it only takes 5 hours for preliminary exploration, which is too short and there are no complete optimization conditions.

This leads to a unilateral increase in the efficiency data of the device to 0.67%, which means that there is still room for improvement.

However, the room for improvement is not very large, and it is estimated that it is almost 1%.

So Xu Qiu didn't waste any more points on the senior sister's C1 system, her background was too bad, it wasn't worth it.

This also reminded him that the simulation experimenters in the simulation laboratory II are not very intelligent now.

You can't believe it all, and you still have to screen it yourself after you get the results in the future.

Thinking of this, he glanced at the traversal results of several PDIs.

These data do not seem to be a big problem, and the performance of the device generally presents an extreme point formed by rising first and then falling.

There may be room for further improvement, but there is no need to try it for the time being, because the price/performance ratio is not high.

Xu Qiu occupied the glove box and began to prepare the solution.

The device that is going to be made today has an effective layer structure of P3TEA: PDI3-B-5/6, which is also the best system obtained through traversal in Simulation Lab II.

The donor material P3TEA only has a small sample of 15 mg in the laboratory. He remembered that this kind of donor had the best performance when PDI dimer was used before, and he can buy some more in the future.

For the receptor materials PDI3-B-5 and PDI3-B-6, Xu Qiu only took back 15 mg, and kept the rest in Zhangjiang for the next molecular structure optimization.

1 ml of each of the two solutions consumed 8 mg of donor and 12 mg of acceptor.

The specific conditions are chloroform solvent, normal spraying, D/A ratio 1:1.5, concentration 10 mg/ml, 1% volume fraction DIO, thermal annealing at 120 degrees Celsius for 15 minutes.

The conditions are very different from the previous PCE11:PCBM system, and the difference from the C1 system of the senior sister is not small.

This is the case in the field of organic photovoltaics. Any change in the donor and acceptor of the active layer material may greatly change the optimal conditions.

Therefore, under normal circumstances, device optimization is a very long process. If you are lucky, it can be completed in one week. If you are not lucky, it may be completed in two weeks or even a month.

The key is to spend a lot of time and cost, but the final result is not necessarily good.

For example, a new polymer donor material was designed for the fullerene derivative system. It took one month to synthesize and another month to optimize the device, but the efficiency was only 4%, which is not high or low, and the probability of SCI Zone 2 is high. Can not send.

If you don't want to waste this work, you can only grit your teeth and spend another month adding other characterizations and writing articles, and posting to SCI District 3 and District 4.

This is not bad. If you encounter some systems, you must add a specified volume fraction of solvent additives to obtain high efficiency. For example, if you do not add DIO, the efficiency is 4%, and if you add 0.5% volume fraction of DIO, the efficiency is 3%. Add 1.5% volume fraction DIO, the efficiency can reach 8%.

When the researchers were optimizing the device, they found that the efficiency decreased after adding 0.5% DIO, so they did not further increase the volume fraction of DIO, resulting in the final efficiency staying at 4%.

In the end, I had the opportunity to publish an article in the first district, but it was posted in the third district, which is very regrettable.

...

After preparing the solution, Xu Qiu returned to the office and walked straight to Chen Wanqing, "Sister, are you going to make devices today?"

"Yeah," Chen Wanqing glanced at him suspiciously, "You want me to help you?"

"Sister who knows me," Xu Qiu nodded, "I have six devices, and they all have to be reversed. How about it, don't conflict with yours."

"Sure, I'll also do inverted structure, but..." Chen Wanqing changed the topic.

"But what?" Xu Qiu had a bad feeling.

"Are you and Han Jiaying..." Chen Wanqing showed an inexplicable smile.

'It's probably because Tian Qing said something, but she has promised her junior to keep it secret. ’ Thinking of this, Xu Qiuyi said righteously, "Even if you are a senior, you can't just make people innocent!"

"Really?" The senior obviously didn't believe her, her scrutinizing eyes flicked back and forth on Xu Qiu's face.

Xu Qiu didn't change his face, and changed the subject, "By the way, senior sister, I have a plan."

"What plan?" Chen Wanqing was indeed attracted.

"Afterwards, we will work as a three-person team. I am mainly responsible for making devices in Handan, and you and my junior are mainly responsible for synthesis." Xu Qiu said, after thinking about it, he included the senior in the plan.

He has a system. With this combination, the time spent on device optimization is very small, and the situation can be fed back to them in real time for them to further optimize the results.

On the other hand, he was also a little worried that it might be dangerous for the school girl to conduct experiments in Zhangjiang alone, but it would be much safer if there were two of them.

Chen Wanqing thought for a while, then nodded, "This is a good idea, does Han Jiaying agree?"

"I've already spoken to her, and she agrees."

"Then I have no objection."

After finishing the senior sister, Xu Qiu went to 218 again.

"Didn't go to Zhangjiang today?"

"Well, the first 3D-PDI molecules have been synthesized."

"Not bad, hurry up and make a device to try."

"I want to buy some P3TEA donors. The optoelectronic company in Shencheng sent some samples over and tried it out. The effect is not bad, and this material is more suitable for the PDI series in the literature."

"Okay, look at it and buy it. Is there anything else?"

"Gone."

"Here are the new documents for you, go get busy and let me know the results of the device."

"good."

Xu Qiu took a box of honey citron tea and left. He complained in his heart, "You don't even ask the price when you buy materials."

Returning to 216, he contacted the photoelectric company to buy 200 mg of P3TEA, which cost 2400 yuan, which should be enough for a while.

The price of polymer donors, except for P3HT with an extremely simple molecular structure, most of them are around 10,000 per gram, and imported ones are even 20,000 to 30,000 per gram.

After that, Xu Qiu found six zinc oxide substrates from his senior sister, and selected two groups of conditions with an efficiency distribution of 3.5%-4% to spin-coat the effective layer.

It would be too exaggerated to use the optimal conditions directly, and it would be too exaggerated, and it might make Teacher Wei have too much expectation.

Not a good choice.

Anyway, he knows exactly how it will perform.

...

In the evening, the class will meet.

At this juncture in the second semester of senior year, it is not very easy to gather students, and there are not all of them.

Counselor Yu Qiang mainly talked about matters related to graduation, this time mainly for students who are looking for a job, which involves signing a tripartite employment agreement and other matters.

For postgraduate students and postgraduate students studying abroad, the process has almost been completed now, and there is basically nothing to do, so they can complete the final project with peace of mind, and just wait for the graduation certificate and degree certificate.

Listening to the counselor's voice, Xu Qiu's thoughts gradually drifted away.

In the university, he has experienced two counselors. When he was in the technical science experimental class in the freshman year, he was a graduate student from the computer department as their counselor. After entering the material department from the sophomore to the senior year, he was replaced by an associate professor of the material department. Yu Qiang.

Generally speaking, he didn't interact with counselors very much. He didn't take the initiative to talk to counselors when he was a freshman. Most of the time, he explored the new life in college by himself.

Later, I heard a few friends who were counselors tell about the bad things they encountered:

If the course is not selected, ask the counselor for help in selecting courses;

Lost in love, seek psychological counseling from a counselor;

Money is tight, ask a counselor to borrow money;

XXX in the class, ask the counselor to make a small report;

There are also attempts to strike up a conversation and develop a wave of relationships beyond friendship.

In short, when the forest grows, there are all kinds of birds.

In addition to the tutor system, the Department of Materials has another tutor system, which is different from the tutor for graduate students. This system is dedicated to undergraduates, and it is nominally to provide scientific research guidance for undergraduates.

Three majors, each with a tutor, usually a green pepper scholar with little qualifications.

Because there is no benefit, the interest of the instructors is not very high.

Xu Qiu, the tutor of materialization, only had formal contact once. It was when they visited the dormitory during their sophomore year, and they had no contact since then.

The counselor's words are actually beneficial, and they can take the path of talent engineering.

Dedication for three or four years can be exchanged for a chance to maintain a graduate school, and there is even a slight chance to stay in school.

However, given the current market situation of Shanghai Comprehensive University, even staying in the school is an administrative post, such as teaching affairs, and there are not many places, but it is a way.

If the time is pushed back ten years, it is possible to stay in school after graduation and become a lecturer directly.

Now, it's getting harder and harder.