Hand rubbing nuclear fusion live in the wilderness

Chapter 184 Making Silicon Carbide Transistors
After checking and confirming that there was nothing wrong with the first silicon carbide crystal, Han Yuan processed the remaining dozens of silicon carbide crystals according to different needs.

Turning off the power of the lathe, Han Yuan turned and went into the storage room, and found a wooden box from the corner.

Inside the wooden box were pieces of yellow-white plate-shaped objects. After taking out a large piece of plate-shaped material from inside, Won covered it with plastic film, closed the box and stuffed it back into the corner.

On the bullet screen, the audience curiously asked what it was, and Han Yuan replied casually: "This is paraffin, and it will be used to carve silicon carbide crystals later."

【Can paraffin wax be used to carve silicon carbide? 】

[I remember that paraffin is not corrosive, right? 】

[Isn't paraffin just a candle? 】

[By the way, did you all see the inside of the ass hole in the previous live broadcast?Didn’t the anchor say that silicon carbide can only be etched with hydrofluoric acid? 】

[Paraffin wax is definitely not used to corrode silicon. It is used as a protective layer. If you search how glass is carved, you will know what paraffin wax is used for. 】

Seeing the barrage, Han Yuan smiled and replied: "Some viewers are right, silicon carbide is actually a silicon-based material."

"Because of the special properties of silicon, it does not react to general strong acids or bases except for acids containing fluorine."

"That's why there are a lot of glass containers in the lab, because they are resistant to corrosion."

"It is natural to use hydrofluoric acid to engrave silicon carbide crystals. The function of paraffin is to make a coating to prevent hydrofluoric acid from corroding other places that do not need to be engraved."

"The principle is actually the same as engraving glass patterns, first brush a layer of paraffin wax on the glass, and then engrave the required patterns"

"Then brush a layer of hydrofluoric acid on the pattern, and after a period of time wash off the paraffin, the engraved pattern will naturally be corroded by hydrofluoric acid."

"If you are interested in this, you can try it yourself."

"For example, if you have a girlfriend, you can take your girlfriend to carve a piece of glass that the two of you carved together. The commemorative effect is still very good."

"However, it should be noted that although hydrofluoric acid is a weak acid, it has a strong pungent smell."

"It is also extremely corrosive and can strongly corrode metal, glass, and silicon-containing objects, so be careful when using it."

Hearing that, the barrage in the live broadcast room increased rapidly.

Although everyone likes to watch the Korean won climb up the technology, it is helpless that the more you go to the back, the more you can't understand it.

But this little thing of taking a girlfriend to play with carved glass is more popular with most people.

【learnt! 】

[This six is ​​totally fine. 】

[Daily coaxing girlfriend skills +1. 】

[This anchor is a scumbag, right?I have talked about a lot of this type of skills before, such as taking girls to knead ceramics, diy plastic flowers, and hand-made windmills, all of which are routines. 】

[I want to ask, what should I do if I don’t have a girlfriend? 】

【The same question. 】

【I'm waiting for the country to send me a girlfriend. 】

Han Yuan, who returned to the laboratory with the paraffin wax, glanced at the barrage, and joked with a smile: "If you don't have a girlfriend, why don't you hurry up and find one?"

After making a joke, Han Yuan put his focus back on the experiment.

The paraffin wax that was taken out was knocked into pieces, put into a glass and melted by heating with an alcohol lamp.

Then stick the melted paraffin with a brush and brush a thin layer on the rough silicon carbide crystal.

Wait for the paraffin wax on the surface of the crystal to cool and solidify, and then use a small knife to clean the paraffin wax on the part that needs to be etched to expose the silicon carbide inside.

Finally, apply a layer of hydrofluoric acid prepared before, and wait for about half an hour.

For a long time, hydrofluoric acid will corrode the silicon molecules in the silicon carbide without paraffin protection, which is convenient for the subsequent embedding of aluminum ions and the embedding of poles.

This approach was determined after he understood the original transistor and integrated circuit fabrication methods.

Although he does not have a lithography machine now, he is temporarily unable to manufacture integrated crystal plates.

But that doesn't mean he can't make silicon carbide transistors using integrated crystal fabrication.

Compared with the original transistor, the silicon carbide semiconductor transistor prepared in this way is smaller and more stable.

And because of the application of erosion plating of integrated circuits, it is also more powerful in terms of power, response efficiency and service life.

If it is said that the original transistor needs [-] pieces to achieve a million calculations per second.

About 2000 transistors made of this kind of silicon carbide crystal material and special techniques are enough.

Although the number is still very large, compared to the number of millions of electronic tubes, two thousand transistors are already very few.

After waiting for 10 minutes, the Korean won cleaned the corroded silicon carbide crystal with clean water, and then repeated this step several times.

Although hydrofluoric acid can corrode silicon carbide, it needs repeated erosion to meet his requirements.

The time required is naturally very long.

It took a whole morning to process [-] rough-processed silicon carbide crystals.

Depending on the function of use, these crystal materials have different shapes, different parts to be eroded, and different degrees of erosion.

After processing these silicon carbide crystal materials, Han Yuan made some lunch first, and returned to the laboratory immediately after eating, instead of resting for a while as before.

He now wants to complete this secondary task as soon as possible.

Back in the chemistry lab, Won took out sulfuric acid, nitric acid and other materials needed in the afternoon from the storage room.

"I told you yesterday that the three transistors have three layers, and each layer has a different material structure and function."

"The silicon carbide crystal material I processed in the morning is just one layer, which is also the main body of the silicon carbide transistor."

"And now, I'm going to add two more layers of poles to the main body."

"The transistor I prepared this time is functionally a signal amplification transistor."

"So I need to add an N-drift layer and a P well to him in the way I explained yesterday, so as to gather electrons and amplify electrical signals."

"As for the material, the N-drift layer is the same as explained yesterday, using aluminum, but it is not simply wrapped with aluminum."

"Instead, aluminum needs to be prepared as aluminum ions, and then implanted into the trenches etched out in the morning to form a stable N-drift layer."

"So I now need to prepare aluminum ions first."

While explaining, Han Yuan handled the materials with his hands.

The preparation of aluminum ions is very simple for him who has mastered the application knowledge and information of primary chemical industry.

It can be prepared by using sulfate or chloride salt under the protection of a strong oxidizing agent.

Moreover, the prepared aluminum ion content is quite high, enough for him to make the N-drift layer in the transistor.

(End of this chapter)