Chapter 326: Unexpected result

After Wei Xingsi left, Xu Qiu returned to the laboratory with the literature in his hand, intending to guide Mo Wenlin while reading the literature.
"Xu Qiu," Mo Wenlin turned her head and said, "You have used up the ITIC in your lock box, so I will use the one from Chen Wanqing's box, but after adding the materials, I feel a little bit wrong, not like ITIC. "
"Oh? Let me see." Xu Qiu leaned over to Mo Wenlin.
Mo 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. He naturally understands the nature of ITIC. It should be a kind of brown powder, not the pure black in front of him. This pure black powder is more like PCBM. After all, the main component of the thing is C-60 is carbon.
Thinking of this, Xu Qiu guessed in her heart: "Look at senior sister's lock box, whether there is a bottle marked with PCBM, and open it."
Karen Mok 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, "Yeah", Mo Wenlin is still quite spiritual, she seems to understand her meaning.
Soon, Mo Wenlin used a stainless steel spatula to scoop it out again. This time it was brown powder, very like ITIC.
"The high probability is that the senior sister put the wrong cover on, I'll ask her to ask." Xu Qiu called out in the air, "Senior Chen Wanqing, come here."
Now he can’t directly make a judgment. The pure black powder in the laboratory is not only PC[70]BM but also PC[60]BM. The C-60 fullerene used for their perovskite is also pure black, but brown There are more powders, except for ITIC, many ADA receptors including ITIC derivatives are brown.
Chen Wanqing came over quickly, and Xu Qiu explained the reason to her.
The elder 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. That's right, I should give the lid to the solution when I prepared It’s reversed, it doesn’t affect your experiments..."
"The problem is not big, just re-match one, wait..." Suddenly Xu Qiu asked, "Mo Wenlin, how many PCBM did you just add in?"
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, and the mass ratio of the donor material H22 is 1:1. I plan to prepare 1 ml of chlorine. The benzene solution is coming."
Xu Qiu snapped his fingers and said, "In this way, add 6 milligrams of ITIC. Anyway, the solution is ready. Use the waste and make a ternary system."
Mo Wenlin thought for a second, then nodded in response: "Good."
"Senior sister, your ternary blend system has someone succeeding you, so happy." Xu Qiu turned his head to tease.
"Oh," Chen Wan gave Xu Qiu a clean look and said, "I'll go back first, remember to put the lid back."
Afterwards, the preparation process of Mo Wenlin's solution went smoothly, and no moths appeared again.
The next day, Thursday.
Xu Qiu took Mo Wenlin to prepare a batch of devices from scratch, including several repeated experiments of several systems, and the PCBM ternary system that was accidentally prepared yesterday.
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Xu Qiu felt that he was very easy to teach, and Mo Wenlin was more worry-free, basically it was easy to get through. For the relatively difficult spraying method, her first operation success rate could be about 90%.
Perhaps it is because Mo Wenlin followed Chen Wanqing to observe and study in the first three days, or it may be that her own talent is good. After all, it is very good to be able to increase the proficiency of organic synthesis to 10% during the master's degree. of.
In the evening, I got the final test result, but it was a bit unexpected.
; The device efficiency of the PCBM ternary system directly exceeds that of the two binary systems, and the values ​​of the latter two are 6.77% and 6.77% respectively.
Although the increase is not large, it is also an increase.
The ternary system of organic photovoltaics has not been very much sought after. Many large research groups are committed to the development of the binary system. The main reason is that many reported ternary systems are not really higher than the binary system.
When the concept of ternary was first proposed, they were all real people. The report's work was like this:
They made two binary systems with efficiencies of 10% and 8%, and then continued to make ternary systems, with the ratio constantly changing from 0.7:0.3:1, 0.5:0.5:1, and 0.3:0.7:1, and then the efficiency value According to the changes of 9.4%, 9%, and 8.6%, it is finally indicated 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 is not as high as duality, so why bother to do it?
As a result, some people began to play tricks, using the standard sample as an example. The efficiency of this system can generally be about 10%. Then some research groups claimed that the efficiency of their standard sample system was 8%, and then added it. A third component X makes the device efficiency reach, for example, 8.66%. Finally, a lot of characterization and analysis are done based on this.
At first glance, the performance of the ternary is better than that of the binary, but in fact, their binary system is not optimized in place.
This is a tacit thing in the academic circle. After all, students are going to graduate, so occasionally there is one or two articles on the water, usually no one will say anything, of course, no good articles can be published.
Just like the initial work of the senior sister, it was actually somewhat related to this kind of operation, because that was her first article, and when the following articles were enough, she would not engage in the ternary system.
Before, someone published an article that satirized this phenomenon.
But the current situation is different. The ternary system in Karen Mok's hands is a real efficiency improvement, because H22: ITIC is a system that has been repeatedly explored through the system and reality. The highest efficiency value is basically determined, and it is left and right.
Xu Qiu continued to analyze, this may be an opportunity brought by the development of non-fullerene receptors.
Traditionally, only PCBM has a good performance. The efficiency of non-fullerene receptors 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 the properties are usually close, which will form a structure similar to the donor alloy, resulting in random device performance. The ratio of the two donor materials changes linearly.
It is now possible to develop a 1D/2A type ternary system, and choose different types of high-performance non-fullerene acceptor materials or fullerene acceptor materials, because the performance differences between them will be relatively large. Instead, complementary advantages may be formed in the system.
Originally, Xu Qiu was still worried about how to assign work to Mo Wenlin, but now she has found a chance for herself by accident.
"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 ~ EbookFREE.me ~ She is just getting started now, and she still doesn't know the meaning behind this result.
"Yes, hurry up and fill in the characterization data. Sending an AM is not a dream." Xu Qiu nodded.
"Really?" Mo Wenlin blurted out excitedly: "Can you send AM?"
"Calm, calm," Xu Qiuxu raised his hand, "Of course, it doesn't have to be AM, but it may also be AEM, or a journal of the same level such as EES. Now we are standing in a new trend. Above, the starting point is high enough, and every new discovery has enough weight."
"Then this job, I can get a work." Mo Wenlin asked expectantly in a low voice.
"Hmm..." Xu Qiu pondered for a while, this kind of achievement belonging to the branch line, it should be no harm to let it out, but after all other research groups are involved, this kind of matter still has to be decided by Teacher Wei, and said: "I'll go to Teacher Wei to report the result and help you fight for it..."
Facing Mo Wenlin's burning gaze, Xu Qiu added: "There should be no problem."
"Great." Mo Wenlin said happily.