I Have a Research Support System

After Wei Xingsi left, Xu Qiu returned to the laboratory with the document in his hand, intending to guide Mo Wenlin while reading the document.

"Xu Qiu," Mo Wenlin turned her head and said, "You ran out of the ITIC in the buckle box, so I used the one from Senior Chen Wanqing's box, but after adding the materials, I felt something was wrong, not quite like ITIC. "

"Oh? Let me see." Xu Qiu moved closer to Mo Wenlin.

Ma Wenlin unscrewed the small brown bottle marked "ITIC" and scooped out a spoonful of black powder with a stainless steel spatula.

Xu Qiu took a closer look and made a judgment: "It's a bit... like PCBM."

He is the developer of ITIC, so he naturally understands the nature of ITIC. It should be a brown powder, not the one that is close to pure black. This pure black powder is more like PCBM. After all, the main component of that thing is C-60 is carbon.

Thinking of this, Xu Qiu had some guesses in his mind: "Take a look in senior sister's lock box, if there is a bottle marked with PCBM, open it and have a look."

Mo Wenlin rummaged for a while, picked up a small bottle, and said, "Yes, this one is marked with PC[70]BM, do you want to scoop it out?"

Xu Qiu said "Yes", Mo Wenlin is quite spiritual, it seems that she understands what she means.

Soon, Mo Wenlin scooped out another spoonful with a stainless steel spatula. This time it was a brown powder, very similar to ITIC.

"There is a high probability that the senior sister put on the wrong cover. I will ask her to ask." Xu Qiu shouted from the air: "Senior Chen Wanqing, come here."

Now he can't directly make a judgment. In addition to PC[70]BM and PC[60]BM, the pure black powder in the laboratory is also pure black. The C-60 fullerene used in their perovskite is also pure black, while brown There are more powders, except for ITIC, many ADA receptors including ITIC derivatives are brown.

Chen Wanqing walked over quickly, and Xu Qiu explained the reason to her.

The senior sister looked at the two small brown bottles, stuck out her tongue, and said weakly: "These two ingredients are indeed ITIC and PC[70]BM respectively, that's right, I should have given the cap to it when I prepared the solution. The cover is reversed, so it doesn't affect your experiments..."

"It's not a big problem, just reconfigure one. Wait a minute..." Xu Qiu suddenly had an idea and asked, "Mo Wenlin, how much PCBM did you just add?"

Although Mo Wenlin didn't know what Xu Qiu was going to do, she still replied truthfully: "6 mg, I added it according to the amount of ITIC, with a mass ratio of 1:1 to the donor material H22, and planned to prepare 1 ml of chlorine Benzene solution is coming."

Xu Qiu snapped his fingers and said, "Well, let's add 6 mg of ITIC to it. Anyway, the solution is ready. Let's use the waste and make a ternary system."

Mo Wenlin thought for a second or so, then nodded in response: "Okay."

"Senior sister, you have a successor to your ternary blending system, so happy." Xu Qiu turned his head and teased.

"Oh," Chen Wan gave Xu Qiu an innocent look, and said, "I'm going back first, remember to put the lid back on."

Afterwards, the preparation process of Mo Wenlin's solution was very smooth, and there were no more moths.

The next day, Thursday.

Xu Qiu took Mo Wenlin to prepare a batch of devices from scratch, including repeated experiments of several PCE10:ITIC and other systems, as well as the H22:ITIC;PCBM ternary system accidentally prepared yesterday.

Xu Qiu felt that it was very easy for him to teach, and Mo Wenlin was relatively worry-free, basically she could master it with one point. For the relatively difficult spraying method, she could have a success rate of about 90% for the first time.

Maybe it's because Mo Wenlin followed Chen Wanqing to observe and study for the first three days, or maybe it's because of her own talent. After all, during her master's degree, she was able to improve a major skill like organic synthesis to 10% proficiency at the fifth level. of.

In the evening, I got the final test result, but it was a bit unexpected.

The device efficiency of the H22:ITIC;PCBM ternary system directly reaches 10.43%, surpassing the two binary systems of H22:ITIC and H22:PCBM, whose values ​​are 10.12% and 6.77% respectively.

Although the increase is not large, it is still an increase.

The circle of organic photovoltaics has not been very fond of ternary systems. Many large research groups are devoted to the development of binary systems. The main reason is that many reported ternary systems are not really higher than binary systems.

When the concept of ternary was first proposed, there were some more practical people, and the work of reporting was roughly like this:

They made PCE10:PCBM, PTB7:PCBM two binary systems with efficiencies of 10% and 8% respectively, and then continued to make PCE10:PTB7:PCBM ternary systems with ratios from 0.7:0.3:1 to 0.5:0.5:1 , 0.3:0.7:1 is constantly changing, and then the efficiency value changes according to 9.4%, 9%, and 8.6%. Finally, it shows that the efficiency of the ternary system will change almost linearly with the content of the two donor materials.

Later, people saw that your ternary system was not as high as the dual system, so why bother to make the ternary system?

As a result, some people began to play tricks. Taking the PCE10:PCBM standard sample as an example, the efficiency of this system can generally reach about 10%, and some research groups claim that the efficiency of their PCE10:PCBM standard sample system is 8%. , and a third component X was added to it, so that the device efficiency reached, for example, 8.66%, and finally a lot of characterizations were done based on this, and a pass analysis was performed.

At first glance, the performance of ternary is better than that of binary, but in fact, their binary system is not optimized.

This is something that is tacitly understood in the academic circle. After all, students are going to graduate, so occasionally there will be one or two articles on the water, and generally no one will say anything. Of course, no good articles will be published.

Just like the initial work of the senior sister, it actually has something to do with this kind of operation, because it is her first article, and when there are enough articles in the future, she will stop engaging in the ternary system.

Someone published an article before, satirizing this phenomenon.

But the current situation is different. The ternary system in Mo Wenlin’s hands is a real improvement in efficiency, because H22: ITIC is a system that has been systematically and repeatedly explored in reality. The highest efficiency is basically determined, which is about 10.12%.

Xu Qiu further analyzed that this may be an opportunity brought about by the development of non-fullerene receptors.

Traditionally, there is only PCBM as an acceptor with good performance, and the efficiency of the non-fullerene acceptor represented by PDI is only within 8% for a long time.

Therefore, the general ternary system is 2D/1A type, that is, two donors and one acceptor. The donor materials are all polymers, and their properties are usually close to each other, which will form a structure similar to the donor alloy, resulting in device performance fluctuations. The ratio of the two donor materials varies linearly.

Now it is completely possible to develop a 1D/2A ternary system, and choose different types of high-performance non-fullerene acceptor materials or fullerene acceptor materials, because their performance differences will be relatively large. On the contrary, there may be complementary advantages in the system.

Originally, Xu Qiu was worried about how to assign work to Mo Wenlin, but now she found an opportunity by herself.

"Mo Wenlin, you have a new job to do." Xu Qiu said with a smile.

"Is it about this ternary blend system? Do you want to go deeper?" Mo Wenlin asked curiously. She is just getting started now, and she still doesn't know the meaning behind this result.

"That's right, hurry up and complete the characterization data, posting an AM is not a dream." Xu Qiu nodded.

"Really?" Mo Wenlin blurted out excitedly: "Can you send AM?"

"Calm down, calm down," Xu Qiuxu raised his hand, "Of course, it doesn't have to be AM, it could also be AM's major sub-journal AEM, or a journal of the same level as EES. Now we are standing in a new outlet Above, the starting point is high enough, and every new discovery has enough weight."

"Then I can get a job for this job." Mo Wenlin asked in a low voice expectantly.

"Hmm..." Xu Qiu thought about it for a while. It shouldn't hurt to give up the results that belong to the branch line, but after all, other research groups are involved, and this kind of matter should be decided by Mr. Wei, so he said: "I'll go to Teacher Wei to report the result and help you fight for it..."

Facing Mo Wenlin's scorching gaze, Xu Qiu added: "There should be no problem."

"Great." Mo Wenlin said happily.