Siheyuan: Starting from a fitter

Chapter 89 Start preparing silicon single crystal

Back home, Li Guocheng took out two books on semiconductors and read them briefly.After nothing has been missed, start simulating the process of preparing the wafer in your mind.

The main processes are pulling, slicing and grinding silicon single crystal rods.

Pulling silicon single crystal rods requires a contamination-free silicon single crystal furnace.According to the book, the inert gas argon or hydrogen is commonly used as the protective gas.The former is currently not known how to prepare it, so give up; the latter is very dangerous, so give up.

I thought that in later generations, one of the subsidiaries of my company would produce vacuum furnaces.I was very curious at that time, so I visited and listened to the report in person, and operated it myself, extracting the vacuum to the power of 10 minus 5.

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

For slicing, the line cutting method commonly used in later generations can be used.Cut the single crystal rod into required thin slices.

For grinding, it is necessary to design a grinding equipment to remove the saw marks and surface damage layer caused by slicing, and effectively improve the warpage, flatness and parallelism of the single crystal silicon wafer.

The most difficult one is to pull the silicon single crystal rod.Li Guocheng simulated a silicon single crystal furnace in his mind, evacuated the vacuum, added purified silicon powder, heated it, dissolved it, put in the seed crystal, and rotated and pulled it.

A silicon single crystal rod with a radius of 2cm and a length of 10cm was pulled out.

Fix the crystal rod and start slicing.Then there's the grinding.

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

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

Next, the work arrangement of the laboratory is to purchase a vacuum furnace and design a slicer and grinder.

As for the purification of silicon powder, he was not good at it, so he asked Wu Liankui to find a way.

perfect.

go to bed.

Get up the next day, enter the secret realm to complete your morning classes, open the door and enter the laboratory.It's about to start here, and I'm very excited.

When I saw the diesel generator next to me, I felt uneasy.It was previously considered that all work needs to be carried out in the secret laboratory, so there must be electricity.Wafers can now be prepared openly in rolling mill laboratories.So this diesel generator doesn't have much effect.Except for keeping the engine so that I can study it when I'm bored, everything else can be taken care of.

Designing high-end chips requires a clean room.The current conditions cannot be established.I have not heard of any institution in China that has a high-standard dust-free workroom.Li Guocheng knew the construction principles of dust-free workshops, but the cost was too high.The rolling mills will certainly not be able to apply for the funds to purchase these things.

In the future, the laboratory in the secret realm will be dedicated to researching chips.This is the most perfect pure space.

Li Guocheng walked out of the room in a happy mood and found that it was snowing. The sky was filled with snowflakes. There was a thick layer of white snow on the roof, trees and ground. The entire earth was covered in silver-white coats. Covering the filth below.

Snowflakes were flying all over the sky, and it didn't feel cold even if it hit my face. Before dawn, I stepped on the snow covering my feet and arrived at the steel rolling mill.Except for the gate post, the factory was empty.

Entering the factory, the joyful mood disappeared.Thinking of what happened in the factory yesterday and those pointing fingers, Li Guocheng felt very irritated.

I originally wanted to visit Zhou's house yesterday, but considering the special nature of that compound, I gave up.Now when he came to the factory, thinking about 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 jade, and started carving.When a holy lotus bloomed in his hands, his heart completely returned to peace.

"Wow, it's so beautiful! How did you do it?" Zhou Xiaojuan exclaimed with a look of infatuation.Only then did Li Guocheng realize that everyone was surrounding him, looking like they had seen a ghost.

In fact, Li Guocheng had already sensed everyone's arrival, but his subconscious trust in the environment made him relax his vigilance.Plus he was in a state of concentration and forgot to keep the secret.

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

Zhou Xiaojuan looked at it and snatched it away, "I want this. Tell me, how much does it cost?"

Wu Liankui and Tang Danian both showed regretful expressions, hating that they didn't take action earlier.

"Give me a cost price, 10 yuan." In fact, Li Guocheng didn't know how much the piece of jade was worth, so he just randomly quoted a price that Zhou Xiaojuan could afford.

"Brother Li, do you still have me?" In order to get the lotus, Wu Liankui actually called him brother.

Tang Danian also looked at Li Guocheng eagerly, and even Wang Gong and the first uncle were a little moved.

"Everyone remember to keep it a secret. If others know, I won't have to do anything every day."

"That's right, everyone remember to keep it a secret," Wu Liankui quickly agreed.

"Everyone prepares his own materials, and I will carve them for you for free. You can specify the items to be carved." Li Guocheng did not want to use the things in the secret realm. After all, those things were hidden and should be more precious.

"Director Wu, I have something to discuss with you." Li Guocheng pulled Wu Liankui to his desk.

"At this stage, the design of the laboratory has been completed, and it will take more than a month to complete the production of parts. Should we engage in semiconductor preparation at this stage?"

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

"I have thought about the entire preparation process. Next, I need to get three pieces of equipment. Purchase a vacuum furnace, design a slicer and a grinder. I will write you the specific parameters and requirements later."

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

"These two things are relatively simple and can be put in charge of Zhou Xiaojuan and Wu Liankui. What do you think?"

"Okay, you can take control of this."

"In addition, the silicon powder needs to be purified, which can be handed over to Wang Gong for research," Li Guocheng added.

"It's feasible. The last time Lao Wang studied the high-temperature stress release process, he was very powerful. You can try the purification of silicon powder."

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

Li Guocheng did not go to the canteen at noon, but stayed in the laboratory.Zhou Xiaojuan helped bring lunch.

Before leaving get off work, the parameters and requirements for the three types of equipment were compiled and submitted to Wu Liankui.Wu Liankui handed the slicer to Zhou Xiaojuan and the grinder to Zhou Danian at that time.

The two were very excited. This was the first product they had designed by themselves in the laboratory.Zhou Xiaojuan very smartly ran to Li Guocheng's side and begged for follow-up technical guidance.

Zhou Danian, a fool, followed Zhou Xiaojuan's example and stayed beside him, nodding in agreement.

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

Looking at the backs of the two leaving happily, I suddenly felt that he was old.

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　Some book friends suggest not to describe technical details, as this can easily lead to drama.so

　　
　
(End of this chapter)