The ups and downs of life in the Siheyuan

Under He Yuzhu's nagging, the time reached midnight.

He set off 500 firecrackers and carried He Yuzhu back to the backyard.

After the New Year, I went to pay my New Year greetings to Professor Xu. This New Year is considered over.

In the following days, he was too lazy to take a walk and stayed at home most of the time.

At this stage, he used various methods to reduce the size of COMS. Finally, we had to consider using CVD technology.

It is the so-called vapor deposition technology, and the main method currently available is to use a thermal reactor.

These are also used in skill books.

But I only mentioned a few sentences, focusing on low-pressure, laser, and microwave CVD technologies.

The underlying technologies of these technologies have not yet been developed and are not achievable.

However, low-pressure CVD technology can be considered in the next few years.

This is widely used in the preparation of high-quality, low-defect thin film preparation technology.

At present, ordinary thermal reactors are sufficient. In order to improve purity, hydrogen furnaces can be considered.

Thinking of this, he had to lower his head and design these basic equipment.

It's like a matryoshka doll of technology, starting with the lowest level of technology and slowly stacking it up until you achieve the ultimate.

Until the start of school, Li Yuan had been modifying his hydrogen reactor.

At the beginning of the new semester, Li Yuanxian went to find Professor Xu, and under his arrangement, he found his head teacher, Mr. Ceng Songling.

He was transferred to the 6th class, and there were 42 people in the class including him.

Li Yuan's arrival was welcomed by the whole class.

This is a typical student representative of the entire school.

Not to mention his reputation as an artist, his inhuman learning ability made his classmates jealous.

Therefore, as a transfer student, Li Yuan did not encounter any difficulties in integrating.

Everyone was willing to help him, especially class monitor Ren Min, who lent him all the books and notes from the previous three semesters.

With this information, Li Yuan studied the courses for the new semester while studying the previous courses by himself.

It only took three months to learn all of this.

At the same time, he takes time to study in the semiconductor laboratory every day.

With the halo and Professor Xu's personal guidance, he quickly integrated into the laboratory.

The nominal leader of the laboratory is Professor Xu, but in fact, his student Gong Liming is in charge of management.

Senior Brother Gong is 35 years old and energetic. He is responsible for pulling 1-inch single crystal silicon.

There are currently two main directions, one is wafer preparation, and the other is transistor preparation.

To be honest, their current method is extensive, depositing metal directly on a wafer.

It is a transistor formed by firing two gold-containing balls in the center on both sides of the silicon wafer to form two PN junctions.

It is now known as the triode.

Li Yuan chose to join the monocrystalline silicon preparation team. The team leader was a female hero, 28-year-old Huang Yan.

The monocrystalline silicon team has a total of 5 people, and now it has 6 people.

Except for the team leader, they are all senior men, which is very in line with the characteristics of the engineering department.

The most high-tech thing inside is the customized single crystal furnace, which is a Czochralski single crystal furnace and is currently the mainstream preparation equipment in the world.

The only pity is that the dry pot area is too small and there is little crystal liquid. Lifting the handle depends entirely on the operator's touch.

If you are not careful, it may break.

And the method used is not the rotational pull method, but the most primitive direct pull-up method.

Therefore, the diameter of the crystal cylinder has been unable to achieve a breakthrough, and the overall thickness is uneven.

The diameter of the wafer directly affects the cost, productivity and yield of semiconductor production.

It is a consensus that the closer to the edge of the wafer, the worse the yield rate.

But now he is just a transfer student, although there are corresponding improvement techniques in his skills.

But he is not yet qualified to suggest improvements.

His main job now is to study like crazy.

It must be theoretically recognized by the teachers and classmates in the laboratory. Only then can his proposal be adopted.

He studied hard every day and helped in the laboratory.

The time has come in June.

At this time, Li Yuan's hands-on ability was recognized by the laboratory collective.

At present, he can pull single crystal silicon under Huang Yan's guidance.

Compared with others in the laboratory, the single crystal silicon he pulled out was the most uniform.

It shows how strong his touch and control are.

Now, he is like a tool man. When other people in the laboratory come up with ideas for improvement, he helps verify them.

Fortunately, Huangtian paid off, and finally in mid-June, the diameter of the single crystal silicon was reduced to 6 inches.

Although the progress may not seem big, compared to a laboratory that started from scratch, this is a very big leap.

After all, the current wafer diameter in the world is generally at this level, and the most powerful one is only 2 inches.

On this day, when everyone was discussing new processes, Li Yuan suddenly said something.

"Teacher Huang, I have always had a feeling that a rotating force is generated when pulling.

Combined with the surface tension of silicon liquid, can the diameter of the wafer be increased? "

A word woke up the dreamer, everyone looked at Li Yuan, and then looked at Huang Yan.

"I think I can give it a try."

"agree".

"agree".

. . . . . .

An hour and a half later, everyone looked at the single crystal pillar with excitement.

"At least 2.5 inches," Huang Yan muttered.

"It should be more than that."

. . . . . .

Another 10 minutes passed, and when the last drop of crystal liquid in the crucible was rotated and lifted up, it meant that the lifting was over.

When cooling was completed, Li Yuan carefully removed the single crystal column from the fixture.

Huang Yan started measuring excitedly.

"The thinnest part is 78.2mm, and the main body is 79.1mm," Huang Yan reported the measurement data tremblingly.

Thunderous cheers suddenly came from the laboratory.

At this time, the monocrystalline silicon placed on the velvet tray looked like a piece of obsidian, with a hint of red in the darkness.

Very good condition.

Half an hour later, Professor Xu and Gong Liming all came to the laboratory.

They all observed the monocrystalline silicon pillars on the tray with excitement.

“I really didn’t expect that you could make such a big breakthrough in such a short period of time.

This is far ahead of Western developed countries, and you are the heroes of the country."

"Professor Xu, the fact that he was able to break through from 1.5 inches to 3 inches is all due to classmate Li Yuan.

It was one of his ideas that allowed us to achieve breakthroughs and transcendence."

Huang Yan did not take any credit and directly told the truth.

Other teachers and students also nodded.

Professor Xu immediately turned his attention to Li Yuan.

"No, no, no, this is not my fault alone. Everyone has made such a plan, and I have personally experienced it.

It means that everyone has eliminated all wrong answers.

I can only think of this method. I am standing on the shoulders of giants.

Just like eating alone, you can’t just say that you are full because of the last mouthful of rice.”

"Hahaha, our classmate Li Yuan is still very humble!

Standing on the shoulders of giants is a very apt metaphor.

He is right, the credit belongs to the entire laboratory."

Professor Xu Qiankun was decisive and had the final word.

The discomfort felt by some teachers and students disappeared instantly.

Li Yuan compared everyone to giants, and if the leader recognizes this, then their efforts will not be in vain.

At the same time, they truly accepted Li Yuan and regarded him as a real one of them.

Instead of just treating him as a junior student who was a helper, as in the past.