Chapter 789 Disclosure of a Technology
"So the next step is to diffuse doping elements on both sides to form the N layer on the front and the P+ layer on the back. I have already given you the relevant materials for the parameters required for these two layers, so I won't go into details here about the specific process. I’ll leave it to you to study the details. You may be more familiar with it than I am.”
This step is not a big problem for Tang Shaohui. The doping and diffusion of silicon single crystals is his specialty.
For him, he has no idea how far each step should be done to make a high-efficiency solar panel. For example, today Gao Zhendong proposed how thick the N and P+ layers should be. He can't understand it. Yes, but how to achieve this thickness, he is faster than Gao Zhendong.
This is the difference between the leader and the implementer. One is responsible for what conditions are needed to achieve the goal, and the other is responsible for how to obtain these conditions.
"Well, there is no problem in this regard. Don't worry, Mr. Gao." Tang Shaohui was very confident.
"Well, very good, very good. The next step is to make velvet. You can also think about it first."
"Fleet making?" Tang Shaohui was a little confused. He had heard of flocking, but he didn't know about flocking. And what does velvet have to do with solar cells?
"Yes, texturing. I want to make the front side of the silicon wafer into a textured surface with many small pits or small pyramids. This can greatly reduce the reflectivity of the silicon wafer and help improve efficiency. Of course, single crystal The methods of texturing silicon and polysilicon are different. ”
Textured cells are the basic structure of mature solar cells. Textured means that from a macro perspective, the surface of the solar panel seems to be textured and rough.
In fact, on a microscopic level, this thing is a structure like small pits or pyramids, forming a textured surface.
Simply put, the function of these textured surfaces is to make the front of the solar panel a rough surface, reducing the reflectivity of sunlight and leaving more sunlight on the battery.
"For single crystal silicon, you can consider etching the edge of the crystal face and using chemical etching liquid for anisotropic etching to achieve texturing. (100) Using this method on silicon wafers, a large number of surfaces can be obtained (111) Faced pyramid. ”
Tang Shaohui didn't expect such a method to be possible. After all, our research on crystals is still in its infancy. He knows how to draw inferences from one example: "General Engineer Gao, can polycrystalline silicon also be processed in this way?"
Gao Zhendong shook his head: "The surface of polysilicon is not complete and continuous, so it cannot be done like this, but you can consider other methods, such as photolithographic printing, laser engraving, etc."
At this step, the directions of monocrystalline silicon and polycrystalline silicon are separated.
However, this step needs to consider not only the front side, but also the back side: "On the back side of the silicon wafer, an aluminum back field needs to be made. Here are the principles and general requirements of the back field. You can take a look first. On the N layer and P+ In the diffusion work of the layer, you can first consider the related work and create some conditions. I will tell you more specifically in the next step.”
Gao Zhendong handed over another piece of material. The two processes were immediately following each other and were somewhat related to each other. It was a good thing to show him in advance and be prepared.
Tang Shaohui felt like he had found a treasure and quickly took it over. These were all useful information. Just like the suede solar panels just now, he had never heard of them. Let alone him. At this time, he had never heard of this thing in China, even Some of the technologies Gao Zhendong will use are not available in the world yet.
Anyway, Tang Shaohui can guarantee that if this project is completed according to the parameters set at the beginning, by then Chief Engineer Gao will be first and he will be second in terms of domestic solar cells.
After watching Tang Shaohui go out, Gao Zhendong returned his gaze to the book on organic synthesis on the table.
——
In Beijing, in the foreign affairs department, a comrade in charge of communicating with Lao Maozi frowned as he read a diplomatic note sent by the other party.
The other party's requirements are not many, just a few, including infrared materials, some special alloys, and microcomputer technology.
Gan, not much is not much, but I can’t stand the high demands. Which of these things can be easily leaked out? Which one can the foreign affairs department decide on its own?
The other party also made it very clear that there have been some problems in the relationship between the two parties recently. If even these "small requirements" cannot be met, it will be difficult for the other party to ensure subsequent exchanges of other technologies.
After all, they have more technology than we do, and apart from some areas, we do have a lot to ask of each other.
Although he knew that Lao Maozi was asking for a high price and was waiting for us to pay him back on the spot, he still felt that the other party's attitude was really aggressive.
He couldn't decide this matter and could only report it.
The leader of the foreign affairs department frowned as he looked at the note in his hand.
These things certainly cannot be handed over, but the threat from the other party is also very realistic.
It is necessary to let the chief know about this matter. This is not only a question of whether technology is provided, but also involves deeper things on both sides, which is decisive. The other party's seemingly reckless note is already a bit of a one-shot deal, so it cannot but be taken seriously.
The chief looked at this thing with no expression on his face. After reading it, he looked relaxed.
"Do they think this is me asking for alimony from my son? It's just that we are not their sons, so we won't give them any of these things." The chief was very calm, not even a trace of anger could be seen on his face.
"Chief, if they cut off our technical assistance..." People in the foreign affairs department were a little worried.
"Just cut it off. Without them, we wouldn't be able to produce anything. Without Butcher Zhang, would we just eat pigs with hair on them? I see that many of our major achievements in the past two years have nothing to do with them. What a joke! Moreover, don’t think too highly of them. Since they want these things by name, It shows that these things are difficult for them. Negotiations are not intimidating! Both parties benefit from cooperation, and two parties suffer from division. Don't they understand this truth? If they want to withdraw. , then retreat, it’s going to rain and my mother wants to get married, so let him go.”
The leader who has grown from nothing to dozens of people is very disdainful of this. No matter how difficult it is, can it still be as difficult as it was 49 years ago? Our own scientists are not just doing it for a living.
"Then do you agree to their other request?" This was sent together with the note requesting technology acquisition. It is considered an exchange proposal from a semi-official organization.
The other side's joint steel organization put forward an idea to increase exchanges between the two countries' steel companies. It was suggested that the two steel companies increase personnel exchanges and learning, organize personnel to visit large steel companies on both sides, and conduct technical exchanges.
Exchange between steel companies? The chief's memory is pretty good, especially when a person is mentioned many times in front of him: "Hahaha, they have a good nose. I'm afraid their suggestion is not from the Iron and Steel Federation. The real idea is also The drunkard’s intention is not to drink.”
"Then reject it directly?"
"No, if you want to communicate, then communicate. If you want technology, then give it to them, but not what they ask for. Let's do the two things together! Give them something better than what they want. What’s more, we’re not just giving it to them, we’re calling on all the countries in the Didi camp, as well as the poor brothers in the developing world, to announce it together, and just give it to them?” The chief laughed. , as if he didn’t take this matter to heart at all.
Check out the 16-9 book bar and see the correct version!
"Chief, why is the technical level so high?"
"What do you think of technologies that can increase steel production, reduce production costs, and improve production efficiency? They want a lot of technologies, but the ultimate goal is to kill people! That's not good. We give them a technology that can increase steel production and contribute to social construction. The technology that contributes to people’s well-being is not much better than what they want!”
The chief said with a smile on his face. In his heart, he may not have considered the gains and losses at this moment. He just felt that this thing is really good. If used well, it can really help. The benefits brought to the poor are not only domestic but also foreign.
After saying that, he didn't even wait for the leader of the foreign affairs department to respond and made arrangements directly.
"You just answer them like this. I will notify the 17th Machinery Department to be prepared. When the time comes, you can come or not. Anyway, our sincerity is to do it. If you are not comparing our superiority, we will compare with this!"
After receiving the notice, the 17th Aircraft Department was confused.
Is this going to reveal the operating line of Gao's blast furnace? Is the above too generous?
But after thinking about it, this doesn't seem to be a big problem.
The Gao's operating line is very good, has a wide range of applications, and is easy to use, but it also means that it is not kept secret at all. If this thing is kept secret, it will completely lose its meaning. As time goes by, this thing will soon be exposed to everyone. In front of you, it is better to be generous. Anyway, this thing is good, but it has not much negative impact.
It doesn't involve any secrets, it doesn't cause trouble, it doesn't kill anyone, and the steel used to fight the war is still the same with or without the line, and nothing will change about that.
Since our goal is "Long live the great unity of the people of the world", if we want to exchange technology for reputation, there is no better way to make it public than this.
"Notify the third branch of the third rolling mill and Comrade Gao Zhendong to prepare..."
The leader of the 17th Machinery Department just said this and shook his head again.
"Forget it, don't inform the No. 3 Rolling Plant. Their place is not suitable. Inform the Beijing Steel Plant and let them organize and handle this matter." Gao Zhendong's place is definitely not as good as Beijing Steel Plant in terms of blast furnace conditions. Secondly, if you leave this matter in the No. 3 Factory so that no one else knows about it, at least the Defense Working Committee will have to jump eight feet high.
Isn’t this going to exhaust the comrades engaged in internal security work to death?
(End of chapter)