Hand rubbing nuclear fusion live in the wilderness

Chapter 188 Silicon Crystal
Han Yuan actually understands the problems of these researchers.

Just as he thought about how to shrink silicon carbide crystals to prepare integrated chips last night.

A qualified scientist will always remain curious about knowledge.

This is the main source of human progress.

But it is impossible for him to spend a lot of time explaining these things, the knowledge involved in the micro level is too complicated.

If blackboard writing is required, even a textbook may not be able to be completed, and it will take too long.

The only way is to let these people watch their live video.

Entering the chemical laboratory, Han Yuan took out the silicon carbide crystal material prepared yesterday, and after preparing other materials, said:

"Yesterday I finished the N-drift layer in SiC transistors."

"All that's left is to deal with the P-well, gate and drain triode."

"Compared to integrated chips, transistors are much simpler to make."

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After talking about today's work arrangement in general, Han Yuan also started to process the materials in hand.

To manufacture the silicon carbide transistor P-well, he uses a piece of low-doped P-type silicon.

The so-called P-type silicon is actually a silicon crystal doped with some boron during the preparation process.

By doping boron, holes can be created in the silicon crystal during the manufacturing process.

The more boron doped, the better the conductivity and the lower the resistivity.

This is the P pole in NPN and PNP transistors.

As for such materials, he did not prepare them in the first-level mission. After all, who would have thought that in the second-level mission, transistors similar to chips would need to be manufactured?
Fortunately, he has the basic materials and the required instruments for making p-type silicon.

As for how to extract high-purity silicon crystals, it has long been no difficulty for him.

The primary material smelting knowledge and information obtained in the novice task at the beginning contained the appropriate smelting method.

Regarding the work arrangement of Won, most of the audience just listened to it, but some audience still raised some questions.

[The anchor wants to prepare high-purity crystalline silicon?I remember this thing seems to be used on a chip, right? 】

[The preparation of high-purity monocrystalline silicon is very difficult. At present, there are very few countries that can master this technology, and they can be counted on one hand. 】

[Does our country have this kind of technology? 】

[Sorry, no!At present, more than 70.00% of the monocrystalline silicon used in the production of chips in our country is imported from China. 】

[Fuck, why don't you notify the police uncle? 】

[What's the rush, the country must have noticed, otherwise who do you think asked those questions in the morning?Just relying on you scumbags? 】

[I just want to know whether the anchor is on the earth, why doesn't he return to China to play after mastering this technology? 】

Seeing the doubts on the barrage, Han Yuan explained: "Everyone misunderstood."

"What I prepared was not single crystal silicon, but high-purity crystalline silicon."

"As you said, monocrystalline silicon is a must for making chips, and it is a form of simple silicon."

"The definition of single crystal silicon is that when the molten silicon atoms are solidified, they are arranged in a diamond lattice to form many crystal nuclei. If these crystal nuclei grow into crystal grains with the same crystal plane orientation, these crystal grains are combined in parallel to crystallize into a single crystal. Crystalline silicon."

"Its preparation requires a special 'single crystal furnace' to pull it straight into a dislocation-free silicon single crystal."

"But crystalline silicon is different. Crystalline silicon can also be called polycrystalline silicon, which means silicon with a purity of 90.00% or more. There is no requirement for the arrangement of silicon atoms."

"Although the purity is similar, the two are very different, and the difficulty of preparation is also completely different."

"As for the preparation of polysilicon, this is very simple and not difficult."

"It can be prepared by ordinary chemical reduction and decomposition methods."

"If it's a chemical reduction method, you can use the tetrachlorosilane hydrogen reduction method or the trichlorohydrosilane hydrogen reduction method."

"That's exactly what I'm going to use today."

"If there is a need in the future, I will show you the preparation of the 'single crystal furnace', and everyone will know it by then."

The last sentence, Han Yuan was actually speaking to the scientific researchers in the live broadcast room.

As some viewers have said, Huaguo does not have the technology to prepare single crystal furnaces, and [-] to [-]% of the single crystal silicon and the equipment for preparing single crystal silicon required for the production of chips are imported from island countries.

The money spent on this every year can be said to be billions of dollars.

After explaining the difference between the two a little bit, and leaving a sentence that could easily cause a heart attack, Han Yuan took out some crude silicon prepared in the first-level task from the storage room.

It is then crushed and ground into a fine powder and placed in a special container that looks like a filter.

At the other end of the container, there is another set of experimental equipment, which contains sodium chloride and concentrated sulfuric acid.

There are alcohol lamps under the two sets of devices to heat them.

Hydrogen chloride generated by concentrated sulfuric acid and sodium chloride is melted into powdered silicon along the pipeline.

After waiting for a period of time, the silicon powder in the container will react with hydrogen chloride to generate trichlorosilane (gas) and hydrogen.

The discharged trichlorosilane and hydrogen enter the next container through the glass tube, and then some impurities contained in it are condensed and discharged by low-temperature rectification.

The purified trichlorosilane enters the reduction furnace and is heated to 150 to [-] degrees by an electric furnace.

Here, trichlorosilane and hydrogen react thermally again to generate high-purity silicon crystals and hydrogen chloride gas.

When Han Yuan talked about this step, the audience in the live broadcast room were dumbfounded.

[Hydrogen chloride and silicon react to form trichlorosilane, and then trichlorosilane reacts with hydrogen to form silicon and hydrogen chloride?What is this? 】

[Is there a difference? 】

[No, the reactions come and go, the final result doesn't change much? 】

【Magic chemistry! 】

[If the middle trichlorosilane is omitted, it means that hydrogen chloride and silicon react to form silicon and hydrogen chloride (dog head)]

[Is there anyone who writes the chemical equation? 】

On the bullet screen, there was confusion. Although chemistry is magical, it is quite rare for raw materials and excipients to react to form products, and products to self-consistently react to form raw materials and excipients.

Seeing the barrage, Han Yuan smiled and said, "This is actually just a reversible two-way reaction in chemistry."

"While it feels magical, it's not against the chemistry."

At high temperature, the trichlorosilane in the container continuously generates high-purity silicon crystals.

After a while, Won stopped reacting after collecting enough high-purity silicon crystals.

After cooling down, the silicon crystals that were solidified in the container were taken out.

The surface of the solidified crystalline silicon block is gray-black, reflecting a luster between glass and metal, with a hint of blue tinge.

(End of this chapter)