Chapter 436: They're all grown-ups, so they can be attracted

On Saturday, the simulation laboratory gave the results of exploration based on "three transmission layer optimization methods".
The first method is to use several new transmission layer materials that do not require high-temperature annealing for spin coating.
The performance of the device prepared by this method is generally slightly lower than that obtained by the previous high-temperature zinc oxide method, and the device efficiency is scattered between 80-95% of the standard sample efficiency.
The performance decline is not necessarily a problem of the material itself, but it may also be the insufficient exploration of the processing technology.
Not only that, most of these transmission layer materials are based on positive structure devices, which is the PEDOT system. Xu Qiu does not want to change the device structure rashly now.
After all, from the time Chen Wanqing joined the team to the present, the inverted structure system based on zinc oxide has been used for three years. If the system is to be switched, the time cost required to adapt to the new conditions is very high.
This is also the choice of most research groups-usually it is not easy to replace the mature experimental conditions, unless this new condition can greatly improve the performance, or has irreplaceable advantages in other aspects.
In fact, Xu Qiu had thought about whether to find someone in the research group to develop positive structure devices.
But now everyone in the group has their own research fields to be responsible, and there is really a shortage of manpower.
Moreover, it wouldn't be great if the work was assigned forcibly, because it was different from the nature of Xu Qiu's previous experiment in which he asked someone to help him.
I helped him do experiments before, whether it’s senior sisters, seniors, post-doctorate seniors, Mo Wenlin, Tian Qing, they are all good to take in the end, at least they can be used as a second article, and some of them have contributed a lot. It can even become a total.
The "development of positive structure devices" is a "long-term investment" experiment.
This kind of experiment will not see any benefit to the individual in a short period of time, but is only beneficial to the long-term development of the research team.
For example, one day when there is a problem with the inverted structure, if the team has a basis for developing positive structure devices, there will be an additional way of solving the problem.
If you ask a student to do this from Wei Xingsi's perspective, it is reasonable, and the student has no choice.
But Xu Qiu is still a student after all, and he is more inclined to the student group from a standpoint.
The most important thing is that he doesn't want to be this villain either.
In Xu Qiu's view, if you want others to work, you must let others see the rewards.
They are all grown-ups, and if they can induce them, they will induce them.
For painting cakes or something, others may help you sincerely for the first time, and help you reluctantly the second time, but not necessarily for the third or fourth time.
Therefore, Xu Qiu finally decided to temporarily classify this method as a candidate, that is, B.
The second method is to use the original sol-gel method to prepare the zinc oxide film while reducing the annealing temperature.
The results show that the annealing temperature of 150 degrees Celsius is just a critical point. At this time, the efficiency of the standard device can reach 95%-100%, that is, the device under the annealing temperature of 200 degrees Celsius has little performance degradation.
When the annealing temperature of the zinc oxide transport layer was reduced to 120 degrees Celsius, the device performance dropped significantly, only 75-85% of the standard sample conditions.
In other words, if you choose the second method, at least 150 degrees Celsius annealing conditions.
Whether such temperature annealing has any effect on the laminated device requires further research.
The third method is the method of YangYang's research group. They call the zinc oxide obtained by the "low temperature method" α-ZnO, which is alpha-zinc oxide.
The device performance using α-ZnO as the transmission layer can reach 85-100% of the standard device efficiency, and some optimization may be needed, but it is generally acceptable.
Because it happens to be an inverted structure, it does not conflict with the current processing technology. Even if it needs to be optimized, it will not be too difficult.
Xu Qiu finally decided to use the second and third methods to test the water at the same time. The first method is likely to be useless, unless a new situation occurs again.
At this time, in the bedroom, Sun Yifan was doing a live broadcast.
Today is Saturday. Sun Yifan usually broadcasts the whole day. Like usual Sunday to Friday, he usually broadcasts it for three hours. Therefore, he usually broadcasts it before Xu Qiu returns from the laboratory.
Seeing Xu Qiuchao coming over to him, Sun Yifan turned off the live broadcast microphone and actively asked: "Right, the class group said that the autumn tour will be organized. The time is set for next Saturday. Do you want to go?"
"I'm not going, I don't have time." Xu Qiuyan was concise. The former doctoral class monitor Mu Xue even asked him if he wanted to go, but he directly refused. Once he entered scientific research, it was as deep as the sea.
After a pause, Xu Qiu asked, "Are you going?"
"I'm not going either," Sun Yifan shook his head and said, "I heard that there are not many people responding to the call of this autumn tour. There are less than 30 doctoral students, masters, and masters, and the main force is still masters. After all, they have no scientific research pressure."
After all, Sun Yifan pointed to the computer in front of him, and continued: "I wanted to go there, but I want to live on Saturday to make up time, so I really can't go away."
Xu Qiu glanced at Sun Yifan's computer screen. Now the number of live viewers in the live broadcast room is 69 people, and there is a flame-like index. It should be that there are not many popular bulletins in the live broadcast room, only a few in a minute.
Xu Qiu asked curiously: "How is your live broadcast now? Is there a high income from live broadcast."
"That's it. It's been more than a week since it started broadcasting, and I made almost a hundred yuan, so I can become a hobby." Sun Yifan said casually.
"It should be necessary to accumulate fans." Xu Qiu thought for a while and said, "Probably a long-term project?"
"Well, you are right, people are inertial, they are used to watching an anchor, and they will keep watching." Sun Yifan changed his words:
"However, this is only theoretical. Now that the major capitals in the live broadcast industry are rushing in and what they will eventually become, it is difficult to say clearly. It is unknown whether the Dousha platform can survive this battle. "
"That's true." Xu Qiu nodded, and then asked: "Seeing how hard you are, do you have any guaranteed income every month?"
"Hmm...Yes, I just signed a contract. As long as the broadcast is long enough next month, I can get more than 2,000 yuan as a guarantee." Sun Yifan paused and said: "Now the platform has activities to attract new people, and new people sign. Afterwards, there will be commissions to get, Xu Qiu, you come to try Si, and we will open seven or three if you get the commission."
"Are you seven and seven?" Xu Qiu asked with a smile.
"You have to ask, of course you are seven." Sun Yifan said in a positive tone.
"Then how much is the commission?" Xu Qiu asked.
"One month's salary after signing the contract." Sun Yifan replied.
"Two thousand yuan? That would bother me anyway." Xu Qiu spread his hands.
"I know you will definitely not come if you are busy." Sun Yifan laughed.
Xu Qiu feels that this kind of pulling heads is a bit familiar. In the early days, food delivery software was subsidized by various platforms. A meal often only cost a penny. Later, several food delivery APP giants cultivated user habits and competed together. After several small companies were squeezed across, the price slowly came up.
To put it bluntly, it is essentially a simple price war. Although the moves are simple, they are good enough to use.
The live broadcast industry has just started, and the subsidy level is certain. However, it is estimated that it will inevitably be cut in the future. After all, capital investment in the live broadcast industry is definitely not for enriching the spiritual world of flower growers, nor for charity. It is for asset proliferation.
The main body must be cutting the audience's leeks, but the other way round is not necessarily cutting the anchor. Just as the commissions charged by the takeaway platform to the merchants are getting higher and higher, Xu Qiu will not go to this muddy water.
On Sunday afternoon, Caiyi 216.
Xu Qiu started to write an article about the "full solution, colorful, translucent" work undertaken by the school sister, and at the same time planned the synthesis route of PTQ series donors and Y series receptors next week.
Mo Wenlin plans to evaporate two batches of devices, a normal batch and a semi-transparent batch, and then use the four-terminal method to test the effect of more than ten systems of laminated devices given by Xu Qiu.
In the evening, they got the device results.
The final result is not satisfactory. After the four-terminal method is laminated, the performance of the most efficient laminated system is only kept as it is, similar to 10%+10%=10%, and the two systems can achieve 10% efficiency. , The device efficiency after the series stack is still only 10%.
Even many systems have a phenomenon of 10%+10%<10%, that is, when two 10% devices are stacked, the final device efficiency is only 9%, 8%, and 7%.
In this situation, Xu Qiu couldn't help but think of dreamy pet metaplasia.
The initial attempt failed, and Xu Qiu began to analyze the reasons based on experimental data.
First of all, because the four-terminal method does not have the problem of device processing technology, the main problem is the current matching problem.
The laminated system has very high requirements for the front and rear battery systems. As long as the deviation is slightly larger, for example, the deviation value exceeds 20%, the final device performance will drop significantly.
In addition, Xu Qiu also found a problem.
That is, even if the top cell uses a 15-nanometer thin layer of gold and silver electrodes, the light absorption loss caused by this translucent top cell is still very large.
In other words, ~EbookFREE.me~ leaves very little light for the bottom cell, which makes it difficult to increase the current density of the bottom cell.
Xu Qiu deliberately tested the average visible light transmittance (AVT) of a single gold and silver electrode before, and it was only 60%-70%, which means that the electrode alone will lose 30%-40% of the light.
If it is placed in a translucent device, it does not matter, because the loss is the second reflected light, which accounts for a small proportion and has little effect on efficiency.
But now it’s extremely critical to make laminated devices, which is equivalent to taking away the ration (light) of the bottom battery.
Thinking of this, Xu Qiu suddenly realized something.
He decisively looked through the device structures of other people in the literature and found that the thin-layer electrodes used by other people in the two-terminal method, the silver deposited is very thin, usually only 2-5 nanometers.
If this is the case, it can explain why other peers do not use the four-terminal method to prepare organic photovoltaic stacked devices.
Without it, the performance is too poor.