told Zhao Ting the good news in the evening, although she didn't know these techniques, but she was excited to see Li Guocheng so happy.

After a good night's sleep, Li Guocheng, who was refreshed the next day, came to the laboratory.

Li Guocheng carried a stool to the door of the assembly laboratory, "Zhou Xiaojuan, you go and inform everyone, today I am going to start the simulation manufacturing of monocrystalline silicon, please don't disturb me."

Zhou Xiaojuan is very interested in semiconductors, and at this stage, Huaxia is engaged in semiconductors, pulling semiconductor technology directly to the floor.

The newspapers advertised at length that an old lady on the street could make semiconductors by pulling a diffusion furnace in an alley. This kind of advocacy that violates the basic law has seriously impacted the semiconductor production and R&D process and capital investment of regular factories.

After Zhou Xiaojuan informed everyone, she ran back with curiosity.

Li Guocheng pointed to the stool at the door, "Go, help me guard it." This notebook is a summary of some of my board design, you can take a look at it first, if you are interested, this task will be handed over to you later".

"Director, Brother Li, please let me take a look on the side, I promise not to affect your work, I will lock the laboratory door later", Zhou Xiaojuan clasped her hands together, kept waving, and asked to stay.

"The observation window is so big, you can see it if you want, but don't make a sound," Li Guocheng thinks that they need to study hard in the future, and it may be more beneficial to see how monocrystalline silicon is prepared.

Zhou Xiaojuan, who got the consent, ran to the door quickly, plugged in the latch directly, and then ran back happily.

"Now it's not interesting to vacuum first, you read the notes for a while, and I'll call you when I pull the monocrystalline silicon", Li Guocheng didn't want to waste time.

Now Zhou Xiaojuan agreed to everything, moved a stool and sat next to the vacuum stove, opened the notes and looked at them.

Half an hour later, the vacuum reached minus 3 power, and Li Guocheng turned on the crucible heating switch. At this time, the crucible is slowly rotated counterclockwise under the heating of the graphite rod to ensure more uniform heating.

The heating rod has been repeatedly determined, and the set current is just right to ensure that the internal temperature of the crucible reaches 1414 degrees Celsius, which is the melting temperature of the silicon powder.

When it was observed that the high-purity silica fume in the crucible was completely melted, "Xiao Zhou, I'm going to start", after shouting Zhou Xiaojuan, Li Guocheng put on heat-insulating gloves, lifted the handle, and the tip of the lifting rod in the vacuum furnace approached the silicon solution downward.

Because the seed crystals are too precious, in addition to harvesting the rags and getting one grain by himself, Wu Liankui helped purchase 2 grains later, and there are only 3 grains in total, so it can't be wasted casually. A silicon block that has been polished to the size of a silicon seed crystal is sandwiched between the tip of the lifting rod, and it is used instead of the silicon seed crystal for a simulated crystal pulling test.

The seed crystal acts like a seed, at the interface between the molten polycrystalline silicon liquid and the solid-liquid seed crystal, the silicon atoms will form regular crystals along the silicon atomic arrangement structure of the seed crystal.

Li Guocheng uses the monocrystalline silicon lifting method introduced in the book, and the process is divided into: seed crystal, necking, shouldering, isonecking and finishing.

The seed crystals are relatively simple, that is, the seed crystals are immersed in silica liquid; At the beginning of crystal pulling, a thin neck with a diameter of 3~5 mm is first drawn out to eliminate the crystalline dislocation, which is called necking. Then enlarge the diameter of the single crystal to the process requirements, this step is called shouldering; With the upward pull, a uniform crystal rod is formed, and this step is called isonecking; Until most of the silicon melt has crystallized into a single crystal rod, leaving only a small amount of leftovers, the step of accelerating the lifting to form a sharp conical bottom is called the finish.

Li Guocheng's energy was all focused on the silicon liquid, and he couldn't even care about the itching from the sideburns, and his right hand gently pressed down on the lifting lever, and successfully completed the neck reduction, but unfortunately he didn't master the strength well, and broke directly, and this time the crystal pulled failed.

At this time, Li Guocheng noticed that because the observation window was too small, Zhou Xiaojuan's face was almost attached to him, which frightened Li Guocheng to stay away quietly.

Li Guocheng pressed the lifting lever down to the end, and then turned off the heating switch and vacuum switch.

"Ah, why did it stop?" Zhou Xiaojuan realized it later.

"It failed, and the silicon block needed to be replaced," Li explained.

At this time, Zhou Xiaojuan's face suddenly turned ruddy, and her heart was entangled, "It can't be that I affected him."

Li Guocheng didn't care, "Lifting is too fast, you need to practice a lot."

When the vacuum chamber returned to normal air pressure, Li Guocheng opened the vacuum furnace door and replaced the silicon block while wearing heat-insulating gloves. Repeat again, vacuuming, melting silicon powder, crystal planting, crystal pulling and other processes.

Each time the failure was different, with Li Guocheng's strong control, he did not pull out a multi-crystal rod that satisfied him within a week.

Finally, let out the mental power to observe the whole process, and note the temperature changes of each process, the speed of lifting, especially the temperature changes when focusing on the isocervical process.

Another week passed, and I took the data recorded by Zhou Xiaojuan to help me, analyzed it from the first time, and made a trend chart of the temperature and crystal pulling stage, and found that most of the failures were related to sudden temperature changes.

There is only one cause of sudden temperature changes, and that is voltage instability. In order to verify, several more sets of data were done, and the results were exactly as expected.

Now that the cause has been found, it is easy to solve. If you want to be an AC stabilizer source, one is that the cost is too high, and the other is that the time is too long, Li Guocheng doesn't want to wait.

Li Guocheng, who was already confused, had no good way for the time being, so he had to ask Wang Gong for help. Unexpectedly, when he said the problem, Wang Gong laughed, "There are so many devices working together during the day, the power consumption is too large, and the voltage is unstable is very normal, you can choose the night."

One word woke up the person in the dream, since he couldn't do it in the morning, after Li Guocheng and Wu Liankui explained the reason, he didn't care about the follow-up, and directly gave him and Zhou Xiaojuan a holiday in the afternoon, went home to rest, and adjusted his state.

At this stage, Zhao Ting only occasionally works overtime, and most of the time she commutes to and from work on time, and the life of the two is honey and oil.

Li Guocheng slept in the afternoon and was woken up by Zhao Ting during dinner at night. He briefly talked to Zhao Ting about today's plans and reasons, and Zhao Ting was very supportive.

At 7 p.m., the first assembly laboratory.

"Why are you here?" Li Guocheng looked at Zhou Xiaojuan and asked suspiciously.

"I want to witness the moment when the first crystal pulling is successful," Zhou Xiaojuan said with a vow.

"Hahaha, this is just a simulation, not a real crystal pull", Li Guocheng suddenly felt funny, "Go back, it's too late and it's not safe."

Zhou Xiaojuan couldn't find a convincing reason, so she had to leave unwillingly.

Looking at the back of the little girl leaving, Li Guocheng was thoughtful.

Drank a cup of strong tea, washed my hands, and waited until 9 o'clock in the evening. Start the vacuum furnace, vacuum, heat the graphite rod, melt the silicon powder, plant the crystal, shrink the neck, put the shoulder, wait for the neck and finish, all in one go.

Perfectly, the polycrystalline silicon rod with a diameter of about 50mm and a length of about 100mm was successfully pulled. The surface has a shallow, uniform spiral pattern, but unfortunately the whole body is black, and there is no luster introduced in the book.

Next, Li Guocheng repeated it 3 more times, and each time it was perfectly reproduced. It was only now that the big stone in Li Guocheng's heart was put down.

Seeing that the time had reached more than 3 o'clock in the morning, Li Guocheng simply entered the secret realm to complete the morning class, rested a little, and at 5 o'clock in the morning, left a note for Wu Liankui, turned around and went home.

At 8 o'clock in the evening, the first assembly laboratory was brightly lit. Onlookers included Li Huaide, Wu Liankui, Wang Gong, Master Yi, Zhou Xiaojuan and Tang Danian.

At this time, Deputy Director Wu Baoguo entered the laboratory and looked at Li Huaide, "Director, all the equipment in the entire rolling mill has been ensured to be shut down."

Li Huaide looked at Li Guocheng and said, "Comrade Li Guocheng, let's start."

Li Guocheng nodded confidently, the same process, the only difference is that it is replaced with a real seed crystal. After an hour and a half, the monocrystalline silicon rod with a diameter of about 50mm and a length of about 100mm was successfully pulled.

Before pulling the crystal, Li Guocheng removed the impurities in the silicon solution through telekinesis.

After the single crystal rod cooled, I saw that it was indeed a black-brown single crystal that was pulled out, with edges and corners, and the crystal surface was shining. This is a complete silicon monocrystalline rod that Li Guocheng dreams of day and night.

After getting Li Guocheng's confirmation, everyone who was afraid to come out before let out a huge cheer. Leaning slightly, everyone gathered around the monocrystalline rod placed on the tray, and was amazed.

Li Huaide delivered an enthusiastic speech on the spot, and once again affirmed that he would vigorously support the research and production of semiconductors.

After the excitement, Li Huaide locked the single crystal rod with a tray in his safe.

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

(End of chapter)