Back at home, Li Guocheng took out two books on semiconductors and read them again. After nothing is missed, the process of preparing the wafer begins in the mind.

The main process is the lifting of silicon monocrystalline rods, slicing and grinding.

Lifting silicon monocrystalline rods requires an uncontaminated silicon monocrystalline furnace. According to the book, the inert gas argon or hydrogen is commonly used as a shielding gas. The former does not know how to prepare it at the moment and gives it up; The latter is very dangerous, give up.

I thought that in later life, there was a subsidiary of my own company that produced vacuum furnaces. At that time, I was very curious, personally visited and listened to the report, and personally operated, pumping the vacuum to the minus 5 power of 10.

Isn't this a pollution-free space that is very suitable?! Putting an electrically heated crucible in a vacuum furnace is not a perfect silicon single crystal furnace.

Slicing, which can be used in later generations, can be used by the line cutting method. Cut the monocrystalline rod into the required slices.

Grinding, it is necessary to design a grinding equipment to remove the saw marks and surface damage caused by the slicing through grinding, and effectively improve the warpage, flatness and parallelism of monocrystalline silicon wafers.

One of the most difficult is to lift the silicon monocrystalline rod. Li Guocheng simulated a silicon single crystal furnace in his mind, pumped out the vacuum, added the purified silicon powder, heated, dissolved, put in the seed crystal, and rotated and pulled.

A silicon monocrystalline rod with a radius of 2 cm and a length of 10 cm is lifted.

Fix the rod and start slicing. And then there's grinding.

Each process is tried and tested repeatedly to ensure the best combination and the best path.

Almost 2 hours passed, and all the processes were formed and imprinted in my mind.

Next, the lab was to buy a vacuum furnace and design a slicer and grinder.

As for silica powder purification, he is not good at this, so let Wu Liankui find a way.

Perfect.

Go to bed.

The next day, I got up, entered the secret realm to finish my morning class, and opened the door to enter the laboratory. It's about to start, and I'm very excited.

When I saw the diesel generator next to me, I didn't feel good. Previously, it was considered that all the work needed to be carried out in the secret laboratory, so there had to be electricity. Wafers can now be prepared in the rolling mill laboratory. So this diesel generator doesn't have much effect. Except for leaving that engine, which you can study yourself when you are bored, the rest can be handled.

Designing high-end chips requires a clean room. The current conditions cannot be established. I have not heard of such an institution in China that has a high standard of clean workshops. Li Guocheng knows the principle of building a clean workshop, but the cost is too high. The rolling mill will certainly not be able to apply for this money to buy these things.

In the future, the laboratory of the secret realm will be dedicated to the study of chips. It's the perfect pure space.

Li Guocheng walked out of the door with a happy mood, and found that it was snowing, the sky was full of snowflakes, and a thick layer of snow had accumulated on the roof, trees, and ground, and the whole earth was dressed in a silver-white coat, covering the dirt below.

The snowflakes were flying in the air, and I didn't feel cold on my face, so I took advantage of the fact that the sky was not bright, and stepped on the snow that did not go on the surface of my feet, and came to the rolling mill. Except for the gate, the factory was empty.

When I walked into the factory, the joy was gone. Thinking of what happened in the factory yesterday, thinking of those fingers, Li Guocheng felt very irritable.

Originally, I wanted to go to Zhou's house yesterday to step on something, but considering the particularity of that compound, I still gave up. Now when he came to the factory, thinking of what he was going to experience next, he wanted to castrate Zhou Jun immediately.

The irritable Li Guocheng forced himself to sit down, took out a piece of hand-held jade, and began to carve. When a holy lotus bloomed in his hands, his heart was completely restored to peace.

"Wow, that's beautiful! How did you do that? Zhou Xiaojuan looked like a nymphomaniac and exclaimed. At this time, Li Guocheng found that everyone was around him, with a ghostly expression.

In fact, Li Guocheng had sensed everyone's arrival, but he subconsciously trusted the environment he was in, which made him relax his vigilance. Coupled with the fact that he was in a state of concentration, he forgot to keep a secret.

Forget it, expose it, it's not a big deal anyway.

Zhou Xiaojuan looked at it and snatched it over, "I want this, you say, how much is it?" ”

Wu Liankui and Tang Danian both showed regretful expressions, hating them for not making a move earlier.

"You give a cost price, 10 yuan", in fact, Li Guocheng didn't know how much the hand-held jade was worth, but just quoted a price that Zhou Xiaojuan could afford.

"Brother Li, do you still have it?" , Wu Liankui actually shouted brother in order to get the lotus.

Tang Danian also looked at Li Guocheng with a blank eye, and even Wang Gong and Uncle Yi were a little moved.

"Everyone remember to keep it secret, and if others know, I don't want to do anything every day."

"Yes, yes, everyone remember to keep it secret", Wu Liankui hurriedly agreed.

"Everyone prepares their own materials, I will carve them for free, and you can specify the carved items", Li Guocheng didn't want to use the things in the secret realm, after all, those were hidden things, and they should be more precious.

"Director Wu, there is something to discuss with you", Li Guocheng pulled Wu Liankui and walked to his desk.

"At this stage, the design of the laboratory has been completed, and it will take more than a month for the parts to be produced. At this stage, should we engage in semiconductor preparation? ”

"What? Are you going to do it? Wu Liankui was a little excited.

"I thought about the whole preparation process, and then I needed to get three pieces of equipment in place. Invest in vacuum furnaces, design slicers and grinders. The specific parameters and requirements will be written to you later".

"Okay, I'm in charge of the vacuum furnace, who do you think is suitable for the design of the slicer and grinder?" , Wu Liankui asked Li Guocheng's opinion, and his attitude became more peaceful.

"These two things are relatively simple, and Zhou Xiaojuan and Wu Liankui can be responsible, what do you think?"

"Okay, you can grasp this."

"In addition, silica fume needs to be purified, which can be handed over to Wang Gong for research," Li added.

"It is feasible, Lao Wang's last research on the high-temperature stress relief process was very powerful, and you can try silica powder purification."

"Okay, I'll go back and write the information. Lao Wu, you first inquire where you can buy vacuum furnaces in China."

At noon, Li Guocheng did not go to the cafeteria, but stayed in the laboratory. Lunch was brought by Zhou Xiaojuan.

Before leaving work, he completed the compilation of the parameters and requirements of the three types of equipment and submitted them to Wu Liankui. Wu Liankui handed over the slicer to Zhou Xiaojuan and the grinder to Zhou Danian at that time.

The two of them were very excited, this was the first product they designed by themselves when they came to the laboratory. Zhou Xiaojuan ran to Li Guocheng's side very smartly and begged for follow-up technical guidance.

Zhou Danian, a simple man, also learned from Zhou Xiaojuan to stay next to him, and kept nodding in agreement.

"Okay, if you have any questions, you can all ask me".

Looking at the back of the two of them leaving happily, he suddenly felt that he was old.

Ask for recommendations! Ask for a commuter pass!

Some book friends suggest not to describe technical details, it is easy to play. So

(End of chapter)