Siheyuan: Starting from a fitter

Chapter 120 Hand-pulled transistor

When I returned to the office, I called Zhao Ting and Mr. Zhao respectively and explained my intention to visit the old man in the evening.

After conveying Li Huaide's intention to Wang Gong, they checked the progress of the slicer and grinder respectively, and then sat down to modify the drawings of the vacuum furnace, with the purpose of realizing the oxidation function of the wafer.

The reason for choosing a vacuum furnace is very simple. During the oxidation process, pure oxygen needs to be injected without other impurities. Otherwise, the wafer will be destroyed.

At around 2 p.m., Wu Liankui left the laboratory with the report revised by Li Guocheng.

Li Guocheng also completed the revision of the drawings before leaving get off work, and asked Zhou Xiaojuan to remember to copy them tomorrow, then take her bag and go straight to get off work.

At Mr. Zhao's house, Zhao Ting was sitting and chatting with her mother and grandmother. I don't know what topic they talked about. Zhao Ting, who was always cheerful, actually acted like a little girl today, with a face full of shyness.

There are three people sitting in the study.

"It's so fast, that's fine, Comrade Li." Mr. Zhao laughed happily after hearing the report.

"In the past five years, we have mobilized nationwide efforts, focusing on the capital and Shanghai, investing up to 5 million to complete the preliminary layout of semiconductors. However, the production capacity and quality have not been ideal, and the cost has remained high. At that time, you proposed research When it comes to semiconductors, I didn't take it seriously at first, but your novel ideas and confidence impressed me. It's not only a test for you, but also a hope for me, old man."

"I didn't expect it. You gave me a surprise so quickly." The old man's words gave Li Guocheng great encouragement and he felt that it was an opportunity to show off his talents.

"In the afternoon, the steel rolling mill just reported to the ministry. The single crystal ingot passed the inspection and the purity reached 8 9s, very close to 9 9s. It is 2 orders of magnitude higher than the Capital Electronics Factory," Dad Zhao reported the latest situation.

"Okay, okay!" The old man became even more determined after hearing the exact news.

"However, it is impossible for your rolling mill to dominate alone, after all, the previous investment was too large. The best solution is that you provide wafer production equipment to major electronics factories across the country."

Li Guocheng was disappointed when he heard this result. He also thought about increasing his subsequent investment by producing wafers.

Seeing Li Guocheng's expression, the old man burst out laughing: "Don't worry, your technology won't be used in vain. I will help you apply for R&D funds."

Li Guocheng thought for a while and realized that it was a planned economy and the whole country was in a chess game. It was impossible for only steel rolling mills to produce wafers, so he quickly felt relieved.

"The current semiconductor production in the country is basically manual, the environment is complex, and there is no pure environment. I didn't expect that you actually invented the vacuum furnace," said Zhao's father with emotion.

"Vacuum furnaces have many applications, especially in some fields such as alloy manufacturing and high-temperature annealing. Vacuum furnaces can produce unexpected effects." Li Guocheng hurriedly promoted the vacuum furnace.

"Oh, one more thing, it seems that you have another task, manufacturing vacuum furnaces for relevant institutions and factories," Mr. Zhao said happily.

Seeing the old man happy, Li Guocheng took the opportunity to make his request, "Old man, our laboratory is short of people now, especially chemists and physicists."

The old man stopped his smile, lowered his head and thought for a while: "Not now!" The old man showed a painful expression, "We can consider sending you some college students, and you must learn to be self-reliant. Of course, you are doing very well now."

In the next few days, at Li Guocheng's request, Zhang Tou, Wang Dayong, Yan Jiefang and Zhang Zhijing came to report one after another. They were not transferred again early next month as previously planned.

Under Li Guocheng's guidance, Zhang Tou quickly mastered the preparation method of single crystal silicon.The main reason is that the design of the lifting rod increases the damping. After trying it a few times, you will soon be able to master it.

Wang Dayong followed Gong Wang to supervise the manufacturing of vacuum furnaces and learned the design principles of vacuum furnaces.

Zhang Zhijing was arranged by Li Guocheng to learn chemistry knowledge. In fact, her main job now is to collect various related chemistry books and study them when Li Guocheng has time.

Time was running out, and Li Guocheng did not dare to place his hopes on Zhang Zhijing's epiphany. After all, the study of chemistry requires a lot of knowledge accumulation and experimental verification.Li Guocheng relies on the knowledge of later generations of middle school, coupled with the reading of a large number of books, hoping to make a breakthrough.

Since the conditions were insufficient, Li Guocheng had to temporarily put aside the research on photolithography machines.Instead, think about how to make individual diodes and transistors.The purpose is to verify the chip circuit with a single device first, so as to facilitate the subsequent design of a dedicated chip.

The laboratory environment is definitely not good. If you want to improve the yield of transistor preparation, you must have a relatively pure environment.

The first thing he thought of was a vacuum furnace, which could be combined with the secret realm to create the desired transistors.

After Li Guocheng discussed with Wu Liankui, he would occupy the laboratory at night.

After she went home and explained the situation to Zhao Ting, not only did she not object, she felt very happy!

That night, after making sure that everyone in the laboratory had left, Li Guocheng inserted the door.

First, turn on the vacuum furnace switch, then come to a hidden corner and enter the secret realm.

There is now a tray on the experimental table in the secret realm, with a 50mm diameter wafer placed on it.This is the first reasonably perfect wafer produced using the newly manufactured slicer and grinder.

One whole single crystal ingot yielded two barely qualified wafers, and the others either disintegrated during slicing or crushed during grinding.

Fortunately, monocrystalline rods can now be manufactured in batches, otherwise no one would be able to bear such losses.

Li Guocheng cut a 2*3mm wafer block and placed it on the experimental table that was repeatedly blown with dust. He used his mind power to carve the shape of the diode and the groove for adding doping on the wafer block with a special engraving knife.

Place the phosphorus and boron into their respective grooves and place aluminum strips on both sides.After leaving the secret realm, observe that the vacuum furnace reaches the power of minus 3 and the temperature reaches 1000°. Quickly pass through the secret realm and place the prepared diodes on the tray of the vacuum furnace. Wait for 30 seconds and enter the secret realm again.

Then use a simple test tool to test the conductive characteristics of the diode.

Not so good, the leakage current exceeds too much.

Re-sculpt, then experiment with doping time and again.

After dozens of times, I finally found a time point, 1 minute and 12 seconds, which is the optimal doping time.

Then 20 diodes were prepared, and more than 100 triodes were prepared using the same method.

Look at the time, it's almost dawn.

Put the finished product into the secret place, throw the failed product in the laboratory, leave a note and go home to sleep.

When I got home, before 5 o'clock, I found that Zhao Ting and Aunt Liu were not at home.

"Hey, I said yesterday was so enjoyable, but it turned out that I worked overtime to gain time." Li Guocheng smiled helplessly.

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(End of this chapter)