Chapter 239: "Yes!"

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As soon as she returned to 216, Xu Qiu was intercepted by her senior sister.
"Brother, the article has been dropped."
"Well, I have already voted."
"Then help me see, how about the synthesis route I designed?" Chen Wanqing beckoned.
Xu Qiu crossed Chen Wanqing's figure and glanced at the direction of the laboratory. Han Jiaying was still doing the test and seemed to notice his gaze. She turned her head and the two looked at each other and smiled.
‘Senior sister’s test results should not be bad, so let’s arrange the senior sister first. Xu Qiu made a judgment at the moment, and sat beside her under the guidance of the senior sister.
Chen Wanqing noticed their little action, but did not break it. She pointed to the PPT and proactively introduced: "This time I chose unit A is 1,3-indenedione."
"It's a new structure again," Xu Qiu arbitrarily responded, simply observing the molecular structure of unit A, and said: "Indene, it should be the conjugate of the five-membered ring and the six-membered ring in the form of a fused ring. The structure, and then there are two carbon-oxygen double bonds (ketones) at carbon atoms 1 and 3 on the five-membered ring. This seems to be a bit similar to the idea I mentioned before..."
"Yes, I was really inspired by you. During this period of time, I designed several structures, and finally left this one." Chen Wanqing smiled lightly, seemingly satisfied with this structure, she turned a page of PPT and said : "This is the optimized route later, how about it?"
"It's really good. Senior sister really found a good structure this time." Xu Qiu exclaimed sincerely, and then followed her thinking and analyzed: "In the molecular structure of 1,3-indenedione, five The carbon-oxygen double bond on the membered ring can introduce a cyano group. There are four positions on the six-membered benzene ring, which can introduce electron-withdrawing heteroatoms, such as chlorine and fluorine, and can also introduce electron-donating methyl groups, and even introduce other kinds of Weird group."
"Wait, five-membered ring and six-membered ring, introducing cyano group, fluorine atom..." Xu Qiu said in surprise: "Senior sister, this is to round up all the comments I made earlier."
"You found out," Chen Wanqing smiled and said: "History tells me that if I have to post an article with my younger brother, of course I have to fully refer to your opinion."
"Hmm..." Xu Qiu fell into thinking. It seems that since he entered the research group, the senior sister's scientific research path has changed accordingly, and the ideas and ideas he put forward in the scientific research field are usually not problematic in general. There is also the mysterious system of heaven, how does it feel like some kind of aura is working?
After thinking about it for a while, Xu Qiu shook his head and turned her attention to the PPT of the senior sister again. This time her focus was on the synthesis of unit A. Unit D chose some common commercial structural units, F8, BDT, IDT, etc.
Xu Qiu found that the synthesis route of 1,3-indenedione for unit A was not marked, and asked curiously: "By the way, how difficult is the synthesis of this material? It shouldn't be difficult from the structural point of view."
"It's not difficult. It can be synthesized through phthalic acid, or you can buy it directly from a reagent vendor," Chen Wanqing paused, changing the subject. "But if you want to modify the structure, you need to start from the original phthalate. Formic acid has begun to introduce various groups."
"The molecular structure is simple. Even if it is synthesized from the raw materials, there will not be too many steps. The reaction can be easily controlled within six or seven steps. This is much easier than the previous C1C4 series of reactions with more than a dozen steps." Xu Qiu After analyzing it, and reading the synthesis route of Senior Sister again, he nodded and said, "Generally speaking, I have no opinion. It's just how Senior Sister intends to name it, C5?"
"After changing to the new system, I plan to start again," Chen Wanqing smiled, "This time I will start naming from CH1."
"All right, you can be happy." Xu Qiufufu, but after another thought, this naming method is really practical, like his 3D-PDI system, the name of the material is very long now, and you will use it if you want to. Try something like X1, X2?
...
There was a lot of time delay on the side of Teacher Wei and the senior sister. When Xu Qiu came to the laboratory to find the senior sister, her testing work was almost over.
Without waiting for him to ask questions, Han Jiaying took the initiative to smile and said happily: "This time the efficiency of the device is very high. The system of the brothers has a maximum of 6.48%, and my system also has 6.21%~"
"The device performance is so good." Xu Qiu looked surprised on the surface, but muttered in his heart: ‘Why is the efficiency deviation so large? ’
‘According to the conditions I reported to her before, the highest efficiency of my system should be around 7%, and now it is only 6.48%; the school girl’s own system should be around 6%, and it is now 6.21%. In the past few experiments, I repeated it in reality according to the conditions of the simulation laboratory. The theoretical value of efficiency and the actual value will not be so different. ’
‘Furthermore, in the results of this time, for several different systems, some have a small performance drop, and some have a small performance improvement. Obviously, this is not a problem in a general part of the device preparation, so most of the problem lies in the preparation of the effective layer. ’
Thinking of this, Xu Qiu suddenly asked: "School girl, did anything unusual happen when you spin-coated the effective layer?"
"Abnormal situation, eh..." Han Jiaying frowned slightly, thought for a while, and then shook her head and said, "It doesn't seem to be there. It is normal spin coating. The film obtained is also uniform and smooth, but after adding solvent additives, the film There will be some changes in the color of the bird. Why did Brother suddenly ask this question? Is there something wrong?"
"That's not true. I'm currently considering how to further improve the processing conditions of the device to see if you find anything." Xu Qiu casually found a reason to deal with it, and thought to himself:
'Film color changes, I have also noticed before that changes in film thickness and microscopic morphology will lead to changes in its apparent color, but there is no obvious correspondence between this color change and device performance. relationship. ’
‘Maybe the problem is not the spin-coating step, but the earlier solution preparation stage, or something else? ’
‘It’s not impossible. The whole process of preparing the device was done by the school girl. I was busy changing the review and didn’t watch her experiment. ’
‘Then the reason for the abnormal device efficiency this time is mostly due to the difference in the experimental operation between me and my school girl. After all, the experimental conditions explored in the simulation laboratory are based on my own operating habits. ’
‘At least it can be regarded as a rough experimental conclusion. The PDI system is very sensitive to the experimental conditions. The same experimental conditions are just changed, but the results are very different. ’
'However, in theory, this batch of devices was prepared by a school girl for the first time. I don’t know much information, so even if there is an abnormality now, I can’t ask too much. The reason behind it is still to be explored by myself. The simulation laboratory is not very convenient, so let's wait for the evening to go back. ’
Next, while testing, Han Jiaying chatted with Xu Qiu, and quickly tested the remaining devices, and no higher performance battery devices appeared. After the test, she made the highest performance battery devices in the five systems. Good mark, save it in a dedicated box.
For cost control considerations, the ITO substrates in the laboratory are recycled.
However, high-efficiency devices are not included in this list. They will be temporarily stored in a foam box specially placed ITO substrates. For easy searching, a marker will be used on the edge of the back of the device to mark the test time and the efficiency value.
Until the article is published, or a more efficient device of the same system is born, they will be taken out and rebuilt.
After copying the experimental data, Xu Qiu casually copied the foam box storing the high-efficiency devices, the remaining solution for the school girl, and her experimental notebook to the simulation laboratory.
Afterwards, the two returned to the office. They separated the data they had obtained, and handed over their respective systems to their own responsibility. This was to allow both people to have data to report.
Use the ORIGIN software to draw the J-V curve, match it with the previous photoelectric parameter table and a synthetic route map, copy it to the template, and the group meeting PPT is completed.
With good efficiency data support, the production pressure is not great.
After completing the PPT for the group meeting, Xu Qiu didn't stay much, greeted Han Jiaying, and the two left the laboratory early, leaving about an hour early.
In the remaining scattered time, there is actually no experimentation. As usual, Xu Qiu usually reads the accumulated literature, but today he has more important things to do.
Back in the bedroom, Xu Qiu and Tao Yan talked about Dashan for a while, and then they went to the student bathroom to make an appointment for a bath.
After returning, Xu Qiu lay on the bed and entered the simulation laboratory to explore the reasons for the deviation in efficiency.
For insurance, he also opened the experimental records kept in the simulation laboratory II and the school girl's experimental record book, and first checked whether the conditions obtained from the simulation laboratory were consistent with the conditions of the school girl's experiment.
"My system, the corresponding conditions at 7% efficiency are... the conditions for school girls to operate are... the two are the same."
"The school girl's system... the two are the same."
"At least that's what was written in her experiment records, and the simulated laboratory records can't be wrong."
"In this case, you can only experiment and try it yourself."
"Speaking of which, I haven't used Simulation Lab I for many days, so I still miss it."
Xu Qiu muttered, transferred to simulation laboratory I, chose the system of "theoretical 7%, actual 6.48%", used the remaining solution of the student girl, and spin-coated three pieces of the same device structure according to the conditions previously provided to the student girl The substrate is placed in the evaporation chamber for evaporation.
Turn on the mechanical pump and molecular pump to draw a vacuum.
With his current authority level, after turning on the 8x acceleration, the glove box instantly vibrated with high frequency, like a wind, forming a afterimage.
Fortunately, Xu Qiu is the absolute master in the simulation laboratory, directly blocking the perception of sound, otherwise it is estimated that he will be noisy to death by the overwhelming "duang" and "duang" sounds.
Not long after the evaporation was over, Xu Qiu got three shiny silver devices.
start testing.
6.52%, 6.61%, 6.47%.
This is the highest efficiency of a three-cell battery device, which shows that the repeatability is still good.
It is not surprising that there is such a result. During the spin coating process, he perfectly controlled each operation process, almost completely consistent.
The conclusion now is very obvious. Compared with the original efficiency of 7% under this condition, it is closer to the result of 6.48% of the school girl.
"In this way, there should be a problem with the solution preparation."
Xu Qiu picked up the dark brown glass vial with a green lid, and while spinning the green cap on its head, he thought.
On the cap is the charming handwriting left by the school girl "X8, CF, 0.4%, 1:1.5, 9, 3.24"
The X8 here actually refers to Xu Qiu's third-generation 8 series 3DPDI molecule. The full name is PDI3-BX-Se-8. If I write an article later, I should simplify it. After all, it is really too long.
The rest is easy to understand, CF is a chloroform solvent, 0.4% is the volume fraction, 1:1.5 is the mass ratio of DA, and 3.24 is the solution preparation date.
"If there is a problem with the solution preparation, the most likely possibility is..." Xu Qiu suddenly realized something and quickly returned to the simulation laboratory II to read the full version of the experimental data.
"Ensure that other experimental conditions remain unchanged, the photoelectric conversion efficiency and the volume fraction dependence (PCE) are: 0% (5.24%), 0.1 (6.18%), 0.2% (6.33%), 0.3% (6.58%), 0.4% (7.01%), 0.5% (6.87%), 0.6% (6.75%)..."
"From 0.4% to 0.3%, the volume fraction deviation is 0.1%, and the efficiency decreases from 7.01% to 6.58%. Looking at this trend, if it is about 0.25%, the efficiency value is likely to be around 6.48%." Qiu analyzed it, and suddenly snapped his fingers:
"The scheming frog keeps touching your stomach, there must be a problem when adding it!"
He recalled his own experimental operation. When adding, he used a 0.5-20 microliter pipette. If the solution is 1ml each time, 0.4% is only 4 microliters. If the solution is only a few In the case of one hundred microliters, the amount added is even smaller.
And it is a liquid with a high viscosity. During the transfer process with a pipette, there will always be a part of it remaining in the pipette tip.
Theoretically, when the pipette tip is designed, the liquid residue will be taken into consideration. For example, if the scale is 10 microliters, it may actually 11 microliters, and the extruded pipette tip is exactly 10 microliters, with 1 microliter. Residue.
However, this design is usually aimed at low-viscosity fluids. For this high-viscosity fluid, 11 microliters may be sucked, 6 microliters extruded, and 5 microliters remaining, which will cause a big difference between theory and practice. deviation.
Xu Qiu had made devices in reality several times before, and did not think too much when adding it. When he saw that he couldn't finish squeezing once, he squeezed out the liquid in the gun tip, waited a few seconds, and squeezed again, repeating it many times. , Make sure that all of them are added to the solution, and then this practice was learned by the simulation experimenter and used in the subsequent simulation experiments...
As for the technique of the school girl's experiment, Xu Qiu guessed that it might be different from him. UU Reading www.uukanshu Com may be squeezed out only once after inhaling, so that the actual amount she added is less than when he added, resulting in a corresponding shift in device efficiency.
Whether it is himself or the school girl, the operating methods used for measuring are a bit rough and the error is too large.
For the previous PCE11 system, they have no need for solvent additives, so there is no concern in this regard;
However, the current PDI system is very sensitive to the amount of addition, so it has to be considered in this regard.
After all, Xu Qiu's goal is to increase the efficiency from 7.4% to 8% and hit the world record.
You need to do your best in every detail.
Xu Qiu pondered for a long time.
"Yes!"
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