Chapter 789: Revealing a Technology

"So the next step is to diffuse the 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. I will not go into details here. The specific process is left to you to study. You may be more familiar with the details than I am."

This step is not a big problem for Tang Shaohui, as the doping diffusion of silicon single crystals is his expertise.

For him, he had no idea of ​​the extent of each step in making a high-efficiency solar panel. For example, he didn't understand how thick the N and P+ layers proposed by Gao Zhendong should be. However, he was more skillful than Gao Zhendong in achieving this thickness.

This is the difference between a leader and an 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, the next step is to make velvet, you can also consider it first."

“Flocking?” Tang Shaohui was a little confused. He had heard of flocking, but he was not sure about flocking. And what was the connection between flocking and solar cells?

"Yes, texturing. I want to make the front of the silicon wafer into a velvety surface with many small pits or small pyramids. This will greatly reduce the reflectivity of the silicon wafer and help improve efficiency. Of course, the texturing methods for monocrystalline silicon and polycrystalline silicon are different."

Suede cell is the basic structure of mature solar cells. Suede means that when observed from a macroscopic perspective, the surface of the solar panel looks like it has velvet on it and is rough.

In fact, at the microscopic level, this thing is a series of small pits or pyramid-like structures that form a texture surface.

The function of these textured surfaces, in simple terms, is to make the front of the solar panel rough, reduce the reflectivity of sunlight, and retain more sunlight on the battery.

"For single-crystal silicon, you can consider etching the edge of the crystal face and using a chemical etching solution to perform anisotropic etching to achieve texturing. Using this method on (100) silicon wafers, you can obtain a large number of pyramids with (111) faces on the surface."

Tang Shaohui had not thought that there was such a method. After all, our research on crystals is still in its infancy. He knew how to draw inferences from one example: "Chief Engineer Gao, can polysilicon also be processed into a velvet surface in this way?"

Gao Zhendong shook his head: "The surface of polysilicon is not complete and continuous, so you can't do it this way, but you can consider other methods, such as photolithography, laser engraving, etc."

At this step, the directions of monocrystalline silicon and polycrystalline silicon are separated.

However, this step requires consideration of not only the front side, but also the back side: "On the back side of the silicon wafer, an aluminum back surface field is to be made. Here are the principles and general requirements of the back surface field. You can take a look at it first. In the diffusion work of the N layer and P+ layer, you can consider the related work first and create some conditions. I will tell you more details in the next step."

Gao Zhendong handed over another set of materials. The two processes were consecutive and had some connection with each other. It would be a good thing to show it to him in advance so that he could be prepared.

Tang Shaohui was overjoyed and took them quickly. These were all useful information, just like the velvet solar panels, he had never heard of them before. Not to mention him, no one in the country had heard of this thing at that time. Even some of the technologies that Gao Zhendong was going to use were not available in the world yet.

Anyway, Tang Shaohui dares to guarantee that if this project is completed according to the parameters and indicators set at the beginning, then in terms of domestic solar cells, Chief Engineer Gao will be first and he will be second.

After watching Tang Shaohui leave, Gao Zhendong turned his gaze back to the book on organic synthesis on the table.
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In the capital, at the Foreign Affairs Department, a comrade who was in charge of communicating with the Russians frowned as he looked at a diplomatic note sent by the other side.

The other party didn't ask for much, just a few things, including wanting to obtain infrared materials, some special alloys, and microcomputer technology.

Damn, it’s not much, but the requirements are high. Which of these things can be easily leaked? Which of them can be decided by the foreign affairs department itself?
The other party also made it very clear that there had been some problems in the relationship between the two sides recently. If even these "small requests" could not be met, it would be difficult for the other party to guarantee subsequent exchanges on other technologies.

After all, they have more technology than us, and apart from some areas, we do have a lot to rely on from them.

Although he knew that the Russians were asking for an exorbitant price and were waiting for us to pay back the money on the spot, he still felt that the other party's attitude was really aggressive.

He couldn't decide on this matter and could only report it.

The leader of the foreign affairs department also frowned as he looked at the note in his hand.

These things definitely cannot be handed over, but the other party’s threats are also very real.

It is necessary to let the head know about this matter. This is not just a question of whether the technology will be provided or not, but also involves deeper things on both sides, which is the decisive factor. The other party's seemingly reckless note has the meaning of a one-time deal, which cannot but attract attention.

The chief looked at this thing with a blank expression on his face, but after reading it, he looked relieved.

"Do they think this is me asking for alimony for my son? But we are not their sons, and we won't give them any of these things." The chief was very calm, without even a trace of anger on his face.

"Chief, if they cut off our technical assistance..." The people in the foreign affairs department were a little worried.

"Let's just cut it off. Without them, we can't make anything, right? Without Zhang the butcher, will we have to eat hairy pigs? I think many of our major achievements in the past two years have nothing to do with them. What a joke! Besides, don't think too highly of them. Since they specifically asked for these things, it means that these things are difficult for them. Negotiations are not something that can scare people! Cooperation is good for both sides, and separation is bad for both sides. Don't they understand this truth? Besides, if they want to withdraw, then let them withdraw. It's raining when the sky is down and marrying when the mother is up. Let them do what they want."

The leader, who had grown from nothing to a group of dozens of people, was very disdainful of this. Could it be more difficult than before 49? Our own scientists are not here to eat for free.

"Then do you agree to their other request?" This was sent together with the note requesting access to technology, and was considered an exchange proposal from a semi-official organization.

The other party's steel joint organization proposed an idea, hoping to increase exchanges between the two countries' steel companies. It 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 and so on.

Steel enterprise communication? The chief has a good memory, especially when a person is mentioned many times in front of him: "Haha, they have a keen sense. I'm afraid their suggestion did not come from the Steel Federation. Their real idea is not from the Steel Federation."

"Then just refuse?"

"No, since we want to communicate, then let's communicate. If they want technology, then give them the technology, but not the one they asked for. Let's do both things together! Give them a technology that is much better than what they want. Moreover, not just them, we will call on all the countries in the camp, as well as the poor developing brothers, and announce it together. Just give it to them? That's overestimating them!" The chief smiled, as if he didn't take this matter to heart at all.

"Commander, what is so advanced in technology?"

"What do you think of a technology that can increase steel production, reduce production costs, and improve production efficiency? Many of the technologies they want have the ultimate goal of killing people! That's not good. If we give them a technology that can increase steel production, contribute to social construction, and improve people's well-being, isn't that much better than what they want!"

The chief spoke with a smile on his face. In his heart, he probably didn't consider the gains and losses or the game of chance at all at that moment. He just felt that this thing was really good. If used well, it could really bring benefits to the poor people, not only at home but also abroad.

After saying this, he made the arrangements without even waiting for the foreign affairs department leader to respond.

"Just answer them like this. I will notify the Seventeenth Machinery Department to prepare. When the time comes, you can come or not. Anyway, we have shown our sincerity. If you are not competing with us for superiority, then we will compete with this!"

The 17th Ministry of Machine Building was confused when it received the notice.

Are they going to make the Gao family blast furnace operation line public? Are the higher-ups being too generous?

But on second thought, this doesn't seem to be a big problem.

Gao's operating line is a very good thing with 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. It is better to be generous. Anyway, this thing is good, but there are not many negative impacts.

It involves no secrets, causes no trouble, and kills no one. There is still the same amount of steel used for fighting, whether there is this line or not. Nothing will change.

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 nothing more suitable than this to be made public.

"Notify the Third Rolling Mill, the Third Rolling Mill, and Comrade Gao Zhendong to prepare..."

The leader of the 17th Ministry of Machine Building just said this and shook his head again.

"Forget it, don't notify the Third Rolling Mill. They are not suitable. Let's notify the Beijing Iron and Steel Plant and let them organize and handle this matter." Firstly, the blast furnace conditions at Gao Zhendong's place are definitely not as good as those at the Beijing Iron and Steel Plant. Secondly, if this matter is placed at the Third Rolling Mill, no one else will know about it, and at least the Fire Prevention Committee will be very excited.

Wouldn't this tire out the comrades working on internal security?

(End of this chapter)