When I returned to the office, I called Zhao Ting and Mr. Zhao respectively, explaining the meaning of visiting Mr. Zhao in the evening.

After communicating Li Huaide's intentions with Wang Gong, he checked the progress of the slicer and grinder respectively, and then sat down to revise the drawings of the vacuum furnace, with the purpose of realizing the oxidation function of the wafer.

The reason why the vacuum furnace was chosen is very simple, pure oxygen needs to be injected into the oxidation process, and there can be no other impurities, otherwise, the wafer will be destroyed.

At around 2 o'clock in the afternoon, Wu Liankui left the laboratory with the report revised by Li Guocheng.

Li Guocheng also completed the revision of the drawings before getting off work, and instructed Zhou Xiaojuan to remember to copy them tomorrow, and then take the satchel and go straight to work.

Old man Zhao's house, Zhao Ting sat with her mother and grandmother chatting, I don't know what topic we talked about, Zhao Ting, who has always been sassy, actually showed a little daughter today, with a shy face.

In the study, there are three people seated.

"It's so fast, it's okay, Comrade Xiao Li", Old Man Zhao laughed happily after listening to the report.

"In the past five years, we have mobilized the power of the whole country, with the capital and the magic capital as the point, with an investment of up to 250 million yuan, to complete the initial layout of semiconductors, but the production capacity and quality have not been ideal, and the cost remains high. At first, I was unimpressed when you proposed to study semiconductors, but I was impressed by your innovative ideas and confidence. It is not only a test for you, but also a hope for my old man."

"I didn't expect it, you gave me a surprise so soon", the old man's words gave Li Guocheng a great encouragement, and he felt the opportunity to show his strength.

"In the afternoon, the rolling mill just arrived at the ministry to report, and the single crystal rod taken passed the inspection, and the purity reached 8 9s, which is very close to 9 9s. It is 2 orders of magnitude higher than the Capital Electronics Factory", Zhao's father reported the latest situation.

"Yes, yes!" After the old man heard this exact news, he was even more determined.

"However, you can't be a single rolling mill, after all, the previous investment was too big. The best solution is that you provide wafer production equipment to the major electronics factories in the country."

Li Guocheng was disappointed when he heard that this was the result, and he also thought about relying on the production of wafers to increase the next investment.

Seeing Li Guocheng's expression, the old man laughed: "Don't worry, I won't take your technology for nothing, I will help you apply for R&D funds."

Li Guocheng thought about it, now it is a planned economy, the whole country is a game of chess, and it is impossible for only rolling mills to produce wafers, so he was quickly relieved.

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

"There are many applications of vacuum furnaces, especially in some alloy manufacturing and high-temperature annealing fields, vacuum furnaces can play unexpected effects," Li Guocheng hurriedly promoted vacuum furnaces.

"Oh, and this, it seems that you have one more task, to make vacuum furnaces for relevant institutions and factories", Old Man Zhao said happily.

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

The old man restrained his smile and lowered his head and pondered for a while: "Not now!" The old man showed a painful expression, "I can consider sending you some college students, you have to learn to be self-reliant." Of course, you're doing a good job right now."

In the next few days, at the request of Li Guocheng, Zhang Tou, Wang Dayong, Yan Jiefang, and Zhang Zhijing came to report one after another, but did not transfer again at the beginning of next month as previously planned.

Under Li Guocheng's teaching, Zhang Tou quickly mastered the preparation method of monocrystalline silicon. The main thing is that the design of the lift rod increases the damping, and if you try it a few times, you will soon be able to master it.

Wang Dayong followed Wang Gong to supervise the manufacture of vacuum furnaces and learn 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 wait for Li Guocheng to learn and comprehend them when he has time.

Time was pressing, and Li Guocheng did not dare to hope for Zhang Zhijing's epiphany, after all, the study of chemistry requires a lot of knowledge accumulation and experimental verification. Li Guocheng relied on the knowledge of the middle school in later generations, plus the reading of a large number of books, hoping to make a breakthrough.

Since the conditions were insufficient, Li Guocheng had to temporarily put down the research of lithography machines. Instead, I thought about how to prepare 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 special chips.

The laboratory environment is definitely not good, and if the preparation of transistors wants to improve the yield rate, there must be a relatively pure environment.

His first thought was a vacuum furnace, which could be combined with the secret realm to create the desired transistor.

After Li Guocheng discussed with Wu Liankui, the evenings in the laboratory were occupied by him in the future.

After going home and explaining the situation to Zhao Ting, not only did she not object, but she felt very happy!

That night, after making sure that everyone in the laboratory was gone, 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 laboratory bench in the secret realm, on which a wafer with a diameter of 50 mm is placed. This is the first wafer that has just been prepared with a freshly made microtome and grinder.

With a single crystal bar, 2 wafers that are barely qualified are obtained, and the rest either disintegrate during slicing or crushed during grinding.

Fortunately, it is now possible to manufacture monocrystalline rods in batches, otherwise no one can stand such losses.

Li Guocheng cut a wafer with a size of 2*3mm, put it on the test bench where the dust was blown repeatedly, released his mental power, and used a special carving knife to carve the shape of the diode and the doping groove on the crystal.

Put phosphorus and boron into their respective grooves and place aluminum strips on both sides. Out of the secret realm, observe that the vacuum furnace reaches the minus 3 power, and the temperature also reaches 1000°, quickly put the prepared diode on the tray of the vacuum furnace through the secret realm, wait for 30 seconds, and re-enter the secret realm.

Then, using a simple test tool, the conductive properties of the diode are tested.

Not so good, the leakage current exceeds too much.

Re-engraving, and then constantly experimenting with doping time.

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

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

Look at the time, it's almost dawn.

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

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

"Hey, I said that I was so happy yesterday, it turned out that I was trying to buy time and go to work overtime", Li Guocheng smiled helplessly.

Thank you all for your support! Ask for recommendations! Ask for a commuter pass!

(End of chapter)