I Have a Research Support System

At 8:50 in the morning, the Handan Campus went to the school bus point of the Zhangjiang Campus.

Xu Qiu, Han Jiaying, and Chen Wanqing parted here, and walked towards Caiyi alone.

The senior sister and the junior sister went to Zhangjiang to continue to synthesize IEICO, IEICS non-fullerene acceptor materials, and wide bandgap donor materials of H4x and PBDB-T systems.

Xu Qiu arrived at Caiyi 216, the door was locked, he was the first to arrive.

After a year of observation, Xu Qiu discovered a phenomenon:

Like Wu Feifei and Chen Wanqing, they can sometimes work overtime in the office until 12 o'clock in the morning at night, but it is rare for them to come to the office in advance, unless there is an early morning test experiment.

That is, you can leave late, but you won't arrive early, which is quite interesting.

Xu Qiu opened the access control with his card, entered Room 216, took out his laptop from his school bag, opened the CHEMDRAW software, and began to draw the synthesis routes of several materials based on the three optimization directions in the morning, and made a total of three pages of PPT for later use. .

Tomorrow Friday, he will go to Kainan University in Jincheng for a visit and exchange with Mr. Wei. Even if he wants to synthesize, he will have to wait until next week.

They will take the high-speed train from Modu to Jincheng. Wu Feifei bought the tickets on Monday, and the round-trip tickets have already been bought.

Because it is not a peak period such as Spring Festival travel, high-speed rail or train tickets are still very easy to buy. After all, the second-class seat costs about 500 yuan, and the business seat is more than 1,500 yuan. The price is very expensive. Naturally, it is very expensive for passengers. After screening, most passengers still prefer hard-seat trains such as K and T, and the price will be much cheaper, only about 150 soft sister coins.

Of course, although the ticket money can be reimbursed, Mr. Wei did not waste the travel expenses and chose the second-class seat. As for the hotel accommodation during the visit, the organizer has already arranged it, so they don't need to worry about it.

After completing the PPT, Xu Qiu went to the laboratory in the inner room and began to prepare the solution.

This time, there are five newly synthesized acceptor materials, and Xu Qiu chose two as donor materials, which are Xuemei's H22 and the reference material PCE10, which means that a total of 10 sets of solutions need to be prepared, which is quite troublesome.

In addition, the zinc oxide precursor solution must be prepared, and the solution of the senior sister has turned yellow last week.

At this time, Wu Shengnan, Wu Feifei and others have come to 216 one after another. Wu Shengnan saw Xu Qiu doing experiments in the room, put down his schoolbag, walked over directly, and said hello:

Xu Qiu, good morning, are you going to make organic solar cells today?

Organic solar cells, this term is so formal... Xu Qiu complained, and then said: We generally call this a device. Today I will indeed make a batch of devices. I plan to make ten systems. I am preparing solutions now. Postgraduate sister, you are right next to me, and I will take you through the process of device preparation. The newly accepted postdoctoral brother, she has changed careers from photoluminescent materials to organic photovoltaics, and a lot of knowledge needs to be relearned.

Okay. Wu Shengnan nodded, and obediently stood beside Xu Qiu.

Xu Qiu glanced at Wu Shengnan next to him, and for some reason remembered her junior, she was the same at that time, standing next to him, sometimes pulling him to ask questions, and now the junior has become able to Independent research workers.

This time, Xu Qiu did not intend to let Wu Shengnan intervene in the preparation of the solution. On the one hand, once the solution is mixed, the device will be cool no matter how you apply it. The key is that it is difficult to tell whether there is a problem with the solution; The speed of the solution is usually relatively slow. The pressure of today's experiment is a bit high, and he has to find time to discuss it with Teacher Wei at night.

In reality, the preparation of devices is still relatively slow. Even if it is continuous rotation in one day, at most two batches of devices can be made, about 40 pieces, and this is still under the condition of sufficient preparation.

If this kind of solution needs to be prepared on-the-spot, it would be good to be able to make one batch a day. For example, for the job of mixing solutions, 10 sets of solutions, if not for a skilled worker like Xu Qiu, it is estimated that it would not be enough to prepare them all in the morning. It is relatively fast, and the average solution takes 5-10 minutes.

In the end, it took Xu Qiu more than an hour to successfully prepare 10 sets of solutions and zinc oxide precursor solutions, and even the Tires of the bottles were filled to the brim.

After leaving the glove box, Xu Qiu led Wu Shengnan to the ultrasonic cleaner and said, I'll teach you how to clean the substrate...

A total of 24 clean substrates were cleaned, just enough to fill a petri dish, and then the transfer layer was spin-coated, the active layer was spin-coated, and evaporation was performed.

There are ten groups of conditions for the effective layer. Xu Qiu planned to prepare 20 pieces. He only made one piece for each condition, and it was successful in one pass, with a success rate of 100%. He handed over the remaining ten pieces to Wu Shengnan for spin coating.

Wu Shengnan damaged three pieces, but the success rate is 12/15, which is 80%. For a postdoctoral student who is new to the spraying method, such a high success rate is not bad.

Xu Qiu remembered that when he was teaching Chen Wanqing, the senior had studied for a long time for the first time, and hadn't learned yet...

For these ten systems, especially the best H22:ITIC system, Xu Qiu synthesized the conditions of the senior H22:IDT-ICIN system, and adopted the optimal conditions close to those obtained in the simulation laboratory, because the next step will be to synthesize With receptor molecules such as IT-4F, IT-DM and FN-4F, there is a high probability that the performance of the device will be further improved, so Xu Qiu did not keep a hand like before.

You can keep one hand, but it's not necessary.

After four o'clock in the afternoon, the evaporation of the device was completed and the test began.

The test is relatively simple. Xu Qiu directly asked Wu Shengnan to operate in the glove box, and he instructed outside:

Connect the positive and negative electrodes of the device to the source meter, red positive and black negative...

Set the test parameters, the area is 0.04 square centimeters...

Test the dark state first...

A dark state curve like this is normal, you can continue to test the bright state...

The first device was the H22:ITIC system that was spin-coated by Xu Qiu, and the bright J-V results appeared on the computer screen.

10.07%?! Wu Shengnan asked puzzledly, This figure doesn't seem to be low. I remember the result reported by Chen Wanqing and the others last week was 7.3%.

That's right, Xu Qiu smiled, and said, It's almost certainly not low, and it's on par with the existing world record for non-fullerenes.

Equal to the world record...? Wu Shengnan was stunned on the spot. Her understanding of the field of organic photovoltaics was only a few words in group meetings. Recently, she was busy with her two articles and the synthesis with Xu Qiu. Have time to systematically learn the knowledge in this field.

However, after all, Wu Shengnan is a postgraduate student, so she quickly regained her composure. While continuing to test, she murmured in her heart: Xu Qiu's brother is really amazing. I don't know how my FNIC system is. If the efficiency can also approach the world record , Is there a chance to post an article on AM and JACS? However, this synthesis idea was provided by Xu Qiu, and I don’t know if he would like to give it to me... Hey, what do I want to do so much, as long as I hold my thighs tightly Yes, there will always be opportunities in the future.”

After the test of this ITIC device, the highest efficiency is fixed at 10.09%.

When the results came out, Xu Qiu took the initiative to suggest: Next, let's test the FNIC system of the post-doctorate sister.

Okay. Wu Shengnan picked up the device of the H22:FNIC system, and placed the connection line above the simulated sun light source.

The first point is only 6.83%. After hastily measuring the other five points, Wu Shengnan said with some disappointment: The highest is only 6.92%.

Wu Shengnan picked up the battery device, looked at the label on it, and said, This is not the device I painted. Could it be that the performance of the system I synthesized is really not good?

Isn't there another system? Xu Qiu said in a casual tone, Maybe a miracle will happen?

Another system, PCE10: FNIC? I'll try it. Wu Shengnan picked up the device that Xu Qiu had spin-coated with tweezers and started testing.

9.42%?! Wu Shengnan excitedly said, So high!

I'll just say, don't give up easily, persist, and miracles will appear. Xu Qiu said with a smile. He knew that postdoctoral senior sisters are more concerned about articles, so he added an additional explanation: If the work is published early, With your system, it is not difficult to publish an AM-level article.

This experiment idea was proposed by Xu Qiu, I... Wu Shengnan said with some embarrassment, she heard the hidden meaning in Xu Qiu's words, that is, to give her the first part of this work.

It's a big deal that we are together. You just need to be in front. Xu Qiu waved his hand and said nonchalantly. It is not good to let the post-doctoral senior sister only contribute. He also plans to let her help in the synthesis. Put a carrot in front of it.

Okay. When it came to this point, Wu Shengnan was not polite, nodded heavily, and said thank you.

It's okay, post-doctorate senior, you can continue to test, I'll go back to the office first. The two most important systems have been tested, and Xu Qiu has no need to stay and watch.

In the end, all 20 devices were tested by Wu Shengnan. The highest efficiency of the ITIC system was 10.09%, and the highest efficiency of the FNIC system was 9.47%.

Wu Feifei, Duan Yun, and Tian Qing, who stayed in Handan, congratulated Xu Qiu and Wu Shengnan after receiving the news. They were not too shocked, because Xu Qiu had created too many miracles.

The first time I was shocked, the second time I was surprised, and then I became accustomed to it...

After dinner, Xu Qiu called the junior girl and conveyed the device test results here.

Congratulations, brother~ Han Jiaying said happily, the donor material is her H22, which shows that her Hxx series is also expected to become the benchmark donor material such as PCE10 and PCE11, which is exclusive to the ICIN series of ADA non-fullerene receptors. body.

Because the school girl was using the hands-free, Chen Wanqing who was next to her also received the message.

Hey, the senior sister sighed softly, and said, I would have chosen the other three paths if I knew it earlier... Is there still time to get on the bus?

Don't be like this, Xu Qiu knew that the senior sister was joking, her IEIC derivatives were already half synthesized, how could she give up before the materials were synthesized, but she still comforted her:

Now you have the IEIC system in your hand. After introducing oxygen, sulfur, and fluorine heteroatoms, the light absorption performance will most likely be red-shifted. Maybe it can become an acceptor material with an ultra-narrow band gap, and a donor with a narrow band gap such as PCE10 and PCE11. Adaptation, the performance will not be low.

I would like to borrow your good words. After Chen Wanqing finished speaking, she handed over the phone to Han Jiaying.

The junior girl turned off the speakerphone, and had some private conversations with Xu Qiu, and the two got bored for a while before hanging up the phone.

Xu Qiu began to sort out the test results this time, planning to put them in the PPT, and then report them together in the evening when discussing the exchange visit with Mr. Wei tomorrow.

PS: That... the double monthly ticket event is almost over, please ask for a ticket.