Chapter 763 High and Low Combination
Gao Zhendong was very happy. Experience is the key. "Well, that's great. Your first task is to produce single crystal silicon with a purity of no less than 5 9s. After cutting, you will get silicon wafers with a crystal orientation of (100). The area of ​​the silicon wafer is 2*4cm and the thickness is 0.2~0.5mm, but the thickness must be uniform. The requirements for the crystal orientation are not very strict. The dislocation density and minority carrier lifetime should be as good as possible, but not too high. Is there any problem?"

Only then did Tang Shaohui understand what Yu Yuncheng meant when he said, "The work assigned by Chief Engineer Gao should not be too far beyond your capabilities, but you always need to work hard to achieve it."

He has never worked on silicon wafers with crystal orientation (100).

But how difficult is this? No, he had never made single-crystal silicon wafers with a crystal orientation of (100) before. The biggest reason was that there was no demand, not that the technology was difficult.

In particular, Chief Engineer Gao was very considerate and relaxed some marginal parameters to focus only on the core issues.

It seems that Chief Engineer Gao has a very clear idea of ​​the direction and route of this project. He is already at ease and can clearly grasp the main and secondary contradictions. This is rare in the basic material preparation of most new projects, where people usually ask for sky-high prices and want the performance in all aspects to be as high as possible.

As a result, the requirements were too high and too comprehensive, and in the end nothing was done well.

Chief Engineer Gao's request is very reasonable. If you know what you want and what you don't want, you can concentrate your energy and resources on the most important direction. The success rate is actually much higher than trying to do everything at once.

It's comfortable! It's really comfortable to work on a project under Chief Engineer Gao!
"Okay, Mr. Gao, then I will get ready to start work." Tang Shaohui was very positive.

Gao Zhendong called Liang Faming, who is now in charge of the daily work of the research laboratory of the third factory. The remaining matters will be communicated by them for the time being. Anyway, the factory has things like single crystal furnaces, so Gao Zhendong does not need to communicate too much at this step.

Solar panels can be made of polycrystalline silicon, but Gao Zhendong’s primary goal is to use them in space, so polycrystalline silicon cannot be used. The photoelectric efficiency deteriorates severely under ultraviolet rays. It is fine to use them within the atmosphere, but when they are outside the atmosphere and face ultraviolet rays directly, that would be a lot of trouble.

However, we should not underestimate polycrystalline silicon solar panels. The biggest advantage of this thing is that it is cheap. Although the efficiency is lower than that of monocrystalline silicon, it is still acceptable. The mainstream efficiency of 13~16% is not unusable in the atmosphere. At least the requirement Gao Zhendong has received now is that the efficiency is not less than 10%, and try to achieve 12%.

Otherwise, how could it be said that Gao Zhendong had already laid an ambush? What he mentioned at the beginning was 15% efficiency of monocrystalline silicon. Even though there are some problems with the current technical environment, this goal is still relatively easy because he directly copied the answer from the previous version.

Watching Tang Shaohui and Liang Faming leave together, Gao Zhendong also returned to his office. The book on organic compound synthesis given by President Xiang had already been sent to him through the confidential channel, and he was busy with this matter.

Tang Shaohui was worthy of being the general recommended by Yu Yuncheng. Five days later, having already had some understanding of solar cells, he took the initiative to find Gao Zhendong.

"Chief Engineer Gao, after learning about the solar cell related technology you provided, I had an idea and would like to report it to you." When saying this, Tang Shaohui was somewhat nervous. Would Chief Engineer Gao think that I was meddling?

It’s not that Gao Zhendong has any psychological pressure on him, but this kind of identity relationship is somewhat stressful for everyone, especially when his ideas are somewhat different from Gao Zhendong’s original arrangements.

Gao Zhendong was very happy. It was a good thing that he could have his own ideas so quickly!
"You say it, say it boldly." He could see a little bit of Tang Shaohui's mentality. There was nothing he could do about it. It was human nature. The only way to relieve the other party's psychological pressure was to have a warm attitude like spring breeze.

"Okay, Mr. Gao. From the basic principles you gave me, it can be seen that there is actually no essential difference between polycrystalline silicon solar panels and monocrystalline silicon solar panels in most aspects, right?"

Gao Zhendong nodded: "Yes, the biggest difference between the two is the basic materials. Other aspects will bring some differences in processing technology, but there is no core difference."

"I'm wondering, can we develop polycrystalline silicon while developing monocrystalline silicon?" After getting Gao Zhendong's affirmation, Tang Shaohui began to grow bolder and expressed himself more smoothly.

"Oh? Tell me your thoughts in detail." Gao Zhendong was very interested.

"Although I don't know much about solar cells, I know the difference between polycrystalline silicon and monocrystalline silicon. The biggest difference between the two is the price. Monocrystalline silicon is much more expensive than polycrystalline silicon."

As a backbone of Institute 1761, Tang Shaohui is very familiar with silicon crystals.

These days, not the next few decades, the electricity consumption alone can create a huge gap in price between the two. Monocrystalline silicon is the result of further processing of polycrystalline silicon. In this respect, polycrystalline silicon has a great cost advantage.

Oh! That's right! I overlooked this point myself. I only thought about space batteries and for a while ignored the use of solar cells. It is far more than that of space batteries. In fact, it is the use on the ground that is its biggest use. And this use does not always require high-efficiency monocrystalline silicon. I was spoiled by the photovoltaic industry decades later. I was dazzled by the cheap monocrystalline silicon flying all over the Internet.

"Yeah, that makes sense. Go on." Gao Zhendong simply let him finish what he was saying, so that the other party would have a stronger sense of accomplishment and satisfaction.

"Okay. So I was thinking, since the foundations of the two are similar, can we develop polycrystalline silicon while developing monocrystalline silicon? The two technologies are branched, but the core parts are similar. This way, the additional research cost should not be too much, and we can get two products with high and low matching."

Tang Shaohui didn't know that monocrystalline silicon solar cells were used in space projects, but he was very clear that at this stage, this kind of thing would definitely not be as popular as polycrystalline silicon, so the high-low combination solution naturally appeared in his mind.

"Well, your suggestion is very good. Then, you write a supplementary adjustment plan and I'll sign it." It seems that the things I've been doing recently have been rather high-level and I've forgotten to be down-to-earth. Fortunately, a comrade reminded me.

Cost will definitely affect promotion. It is indeed very important to have polysilicon as a low-end supplement.

That's a good reminder. Then you can also do the changing of the plan. When it comes to being lazy, I'm the best.

Tang Shaohui was stunned for a moment. Chief Engineer Gao made a decision too quickly.

Also, how did this fall on me? It's not that he didn't want to do it, but he wanted to do it too much. Anyone wants to do it. Normally, the person who makes the plan may not be the leader, but he must be a very important role.

Precisely because of its importance, he never expected that this matter would fall on him. Chief Engineer Gao is too frank.

Just as he thought of this, Gao Zhendong's words made him ecstatic.

Read the error-free version at 69shuba! 6=9+shu_ba is the first to publish this novel.

"Well, why not just start a new project, polycrystalline silicon solar panels, instead of adjusting or supplementing it? In the project plan, make sure to emphasize the sharing of R&D resources with monocrystalline silicon solar cells."

Gao Zhendong might as well give the person a try and start a new project.

For Tang Shaohui, Gao Zhendong's words were undoubtedly heavenly music. The topic was *2, and it was a groundbreaking topic at that.

He couldn't be a leader. Apart from the suggestions just mentioned, he couldn't provide any technology. He could only follow the path provided by Chief Engineer Gao.

But, but, as someone who is bound to be ranked in the top three, there is no need to explain what having one more topic means to him.

As for the issue of not being able to rank in the top three, there is no need to worry about it with Chief Engineer Gao. Old Yu is a role model in front, and he does things absolutely well.

"Ah...Okay, okay, Mr. Gao, I'll do it right away." Tang Shaohui ran away without saying a word.
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Even though it was not long after the Spring Festival, the Defense Work Committee was still very busy. They were responsible for the research and development and production of equipment across the country. It could be said that they had no time to rest.

At this time, the leaders of the Defense Work Committee are listening to progress reports on various major projects. For the ministries and commissions that are in charge of related work across the country, it is very important to control the progress.

"…The progress of the Z-5 modification to attack aircraft is going very smoothly. Currently, the work of replacing the original engine with the latest LYP-6 engine is progressing smoothly and is slightly ahead of schedule. The aircraft's flight performance and payload have been greatly improved. Incidentally, the modification work of the Bie-6 is also going smoothly in the same unit…"

The leader of the Defense Work Committee was very satisfied with this: "Well, with this thing, equipped with a suitable command system and communication equipment, our army big brother will no longer be isolated and helpless, relying on himself to solve problems. The modification of the Be-6 is very important for our control range at sea. These two things are well modified! Well modified! By the way, how about the matching ammunition?"

"In terms of attack aircraft ammunition, there are mainly several major areas. In addition to traditional high-drag bombs and airborne rocket nests, new ammunition is mainly concentrated in three directions: solid light anti-ship missiles, long-range gliding dispensers, and laser-guided bombs. Among them, the long-range gliding dispenser has passed the pre-inspection and is very suitable for traditional sub-type ammunition. Now the latest anti-armor ammunition loading test is being carried out."

The leader knew about the latest anti-armor ammunition, the terminal-sensitive bomb, and had great expectations for its super-high destructive efficiency and striking effect: "Well, if these two things are combined well, as long as the reconnaissance means are a little better, it can cause a devastating blow to the enemy's ground forces. What about the other two?"

(End of this chapter)