Chapter 754 Gao Zhendong, who loves the sea
Just when everyone was relieved, a young voice suddenly spoke.
"This battery doesn't work and needs to be replaced."
Who? Who? Did you just hear the introduction and tell me it can’t be used? It's too unscientific.
When people turned to look at the speaker, their thoughts changed a bit.
Is it really unusable?
——The speaker is Gao Zhendong.
Gao Zhendong has already proved one thing before, that is, when it comes to optoelectronic materials, he has not just one brush, but many brushes.
Even if the optoelectronic material of the camera tube is different from that of the solar panel, they are from the same origin. Not to mention, some comrades also remembered one thing.
The world's first laser was born in the hands of a man named Gao Zhendong. Although the possibility of having the same name cannot be ruled out, judging from the current scientific research environment, talent distribution, and profession, there is a high probability that it is this person.
Everyone looked at Gao Zhendong, waiting for his explanation.
"Although N-type substrate solar cells have high conversion efficiency, they have a fatal flaw. They are fine for use on the ground and in the sky, but they will not work in outer space."
When the leader talked about the N-type substrate, Gao Zhendong immediately remembered that he had processed a batch of N-type substrate monocrystalline silicon wafers for an external system unit. It must be this batch, because this was the first time since the birth of monocrystalline silicon. One of the few silicon wafers processed outside the 12-machine department system.
Combining the quantity and doping type, Gao Zhendong easily identified the destination of this batch of silicon wafers, which was to be used in solar panels.
It turns out that they are used to make P+/N-type solar cells on N-type substrates, so Gao Zhendong has something to say.
In his previous life, when he was a junior in college, he started working on telemetry systems with his teacher. He still had a relatively deep understanding of solar cells. There was nothing he could do about it. The instructor was capable, but the requirements were really high. That's what he said.
——"This thing is for you to practice. It is not a serious project, but if you want to practice, you must master all the relevant knowledge. The telemetry system itself is not important. What is important is that you must pass This small topic will help you master the basic knowledge of all aspects of the telemetry system and prepare for larger topics. ”
As the most common power supply for telemetry systems, solar panels are not even one of them. Gao Zhendong naturally put in a lot of effort to understand it. He couldn't do it without doing it. The director scolded people so much.
Therefore, Gao Zhendong knows very well what will happen to N-type substrate solar panels in space. This is also the reason why the solar panels built for the second satellite in his previous life were rerouted midway.
"What flaw?" Seeing that Gao Zhendong used the adjective "fatal flaw", everyone knew that this matter was probably irreversible.
Gao Zhendong looked at the leader of the National Defense Working Committee: "Can you tell me?"
The leaders of the National Defense Work Committee knew that the silicon wafers for these boards were processed by Gao Zhendong. At that time, the production capacity of the only company in the country was unparalleled. Even now, there are not many with production capacity, so Gao Zhendong should be aware of the situation. With understanding and his own opinions, he asked himself if this was just to confirm that the processing of this batch of silicon wafers was done by his hands.
"Say it, there are no problems with gay people here."
Gao Zhendong nodded: "This batch of silicon wafers was processed by us. There were some necessary tests after processing. During the test, combined with theoretical analysis, I found that the P+/N-type solar cells on N-type substrates are in high-energy radiation environments. Under this condition, its conversion efficiency will decay rapidly, which means that if this kind of solar cell goes into space, it will die faster.”
By the time Gao Zhendong learned about it, not only us, but all aerospace solar cells around the world were N+/P-type cells on P-type substrates. This is why.
What Gao Zhendong said is true and false. This kind of test must not have been done, but everyone doesn't know. If he added the sentence "combine theory", then others won't know whether he discovered it through testing or theory. Even if it is finally discovered that the third rolling mill did not perform such testing at all, it can still be attributed to theoretical analysis.
As for theoretical analysis, no one can doubt Gao Zhendong. As a top expert in optoelectronic materials, he said that if there is a theory, there is a theory.
In order to speak out this issue reasonably, Gao Zhendong really worried.
When the comrades heard this, it turned out that the fatal flaw mentioned by Gao Zhendong was not an adjective, but a description of the facts.
——Lethal (Physical).
No one doubted Gao Zhendong's words.
"Fast decay is really fatal." "Well, yes, it doesn't need to decay to 0. As long as it decays below the design power requirement, the battery will starve to death. Unhealthy charging process is also fatal to the battery. ”
“I only knew that P+/N was highly efficient, but I didn’t expect this problem to exist.”
This cannot be blamed on the comrades who did the preliminary work. This kind of problem either needs to be studied in depth or tried by heaven, otherwise it will not be discovered. And up to this time, we have no conditions in these two aspects. In this case, the advantage of P+/N solar cells with slightly higher efficiency under the current technical environment is reflected.
"And the efficiency of 7% is too low. Even if it reaches 10%, it is not very good. It puts forward excessive requirements for the weight of the solar panels that the satellite needs to carry, which affects the actual mission load weight of the satellite."
No, what you said is too much. To reach 10%, it is possible only through the efforts of comrades. You deny it with just one sentence?
Hehe, hahaha~~~~~~
Unlike other comrades, the people of the National Defense Working Committee probably had this mood in their hearts. They were not angry at all, but on the contrary, they were very happy.
Before the National Defense Working Committee spoke, some comrades still raised doubts: "Comrade Zhendong, 10% is not enough? And this is the efficiency of P+/N solar cells with better efficiency. If it is replaced by N+/P, I am afraid it will still be up to 10%." Can’t achieve this efficiency? ”
I'm not questioning the replacement of solar panels, but saying that the efficiency is 10% lower does not leave a way out for myself. To put it in detail, it is also a kind of care from the seniors to the younger ones. They even found a reason to replace it with N+ /P, naturally low.
At this time, Gao Zhendong no longer pays attention to keeping a low profile and biding his time. Young people still need to be aggressive. I don't think these seniors will care.
"It's like this. When I was producing the batch of P+/N solar panel substrate silicon wafers, I also studied some related content and gained some insights. I feel that the efficiency of solar cells is not just the photovoltaic basic material itself. problem, and the overall structure of the solar cell is also very Important, including some optical aspects. I conservatively estimate that if the design is proper and the optoelectronic materials are optimized, the efficiency of even N+/P solar cells will not be less than 15%, which is the same as Citigroup’s current efficiency. The level is basically the same.”
Sure enough, Gao Zhendong's habit has never been to just ask questions and then walk away, but to raise problems and bring solutions. If there is no detailed plan, at least there is a technical route. It was too late to even come up with a technical route, but at least he could come up with an idea that seemed feasible.
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The leaders of the National Defense Working Committee were all smiles. With such capable officers, there is no need to worry about the failure of a major event!
However, Gao Zhendong's words still had a lot of impact on other seniors, 7% to 15%!
Your "by the way" is a little too deep. Very few people can "by the way" more than double the core parameters of a product, and they also change the technical route and use technology with a more inferior principle to achieve it.
This was the first time that Gao Zhendong officially appeared in front of these top players. This first time gave them a big shock. This young man is incredible.
"Twelve, just 12%." The leader of the National Defense Work Committee said cheerfully. This kind of talent should be protected and used. If you don't lay an ambush, I will do it for you.
In fact, what he didn't know was that Gao Zhendong raised 15% and had already laid an ambush.
The leaders of the meeting with the National Defense Working Committee did not even question or ask more questions, and just nailed the matter down. Some seniors became anxious.
"Leader, should you be more conservative?" Needless to say, this young man's technical skills are very high. The more he is like this, the more he must protect him. This is not a cabbage in the field.
The leader knew what they were worried about. He smiled and shook his head: "It doesn't matter. I know it in my heart. 10% will meet the standard and 12% will be enough."
The seniors were relieved. In fact, the leaders of the Defense Working Committee were thinking completely different things from them. The leaders knew clearly that if Gao Zhendong said 15, then the probability is 15. He dared to vouch for it. If this thing was really done, it would definitely be 15. At around 15%, it won’t be much lower.
He knows Gao Zhendong very well. This kid sometimes looks radical, but he is actually very steady!
"If it can really reach 12%, there will be many places that can be used. Hahaha, there were some places where power supply was inconvenient in the past, but they were still capable of carrying out related work."
"Yes, actually 7% can do a lot of things. With the battery, it can provide a more stable power supply for a long time."
In fact, the attenuation of solar panels on the ground is not as serious as legend has it. my country's first 10kw photovoltaic power station was built in 1983. 40 years later, it still has a power of about 7kw. However, the solar panels of this power station are Donated from abroad, the little devil was indeed very good at this at that time.
Gao Zhendong smiled and said: "Yes, for example, on the sea and on the island, it can at least provide basic daily electricity guarantee and basic communication guarantee. It can also be used for unmanned automatic monitoring in some places with difficult conditions."
Speaking of this, he was no longer sleepy. His first subject in his previous life was this thing, and it was easy to pick it up.
On the islands and reefs, as long as the basic electricity for daily use and communication are solved, people can be defended. The air conditioner may not be able to be moved temporarily, but at least it is okay to bring an electric fan, right?
Everyone in the National Defense Working Committee laughed inwardly. Comrade Gao Zhendong still "loved" the sea so much.
(End of chapter)