Chapter 320 The most common topics on the Internet in the previous life

Yu Yuncheng acknowledged what Gao Zhendong said. Looking at the current attitude of the ministry, to put it in an exaggerated way, even if he just wrote his name and the amount, the probability of the ministry approving it would be very high. Not to mention such a small matter as the lack of specific process, the problem could be solved by just saying that confidentiality is needed.

The main thing is that they can deliver goods, which is more reliable and persuasive than anything else. Not to mention the distant past, the department was very happy with the achievement of single crystal furnace and silicon single crystal not long ago.

Yu Yuncheng was also very happy to let Gao Zhendong write the materials. This was first-hand information. If someone who was not at that level wanted to take over? You are so beautiful. You didn't even let me take a look at it.

While Yu Yuncheng was happily doing hard labor, Gao Zhendong's place also welcomed another group of customers.

——Director Lu and Chief Engineer Lu of Factory 1274.

The two were a bit impatient. As soon as the single crystal furnace was completed, they couldn't wait to defeat the 1218 Factory that was eyeing them covetously, and took over the task of conducting semiconductor process research under the leadership of Gao Zhendong.

This time, I am here to report the results of the previous factory resource survey in order to prepare for the next step of work.

Gao Zhendong received the two warmly and carefully studied the current situation of Factory 1274 that they brought.

As one of the factories directly supported by the Russians, Factory 1274 undoubtedly represents the highest level of domestic semiconductor technology. From their situation, we can clearly understand the domestic semiconductor manufacturing technology.

After reading about the situation at Factory 1274, Gao Zhendong was a little puzzled. This factory really produced crystal triodes, and its production process was relatively primitive.

Let’s put it this way, a silicon wafer a few millimeters square can be used to make a CPU in the future, but in most semiconductor factories at this time, it is only enough to make a transistor, or even half a transistor.

Unlike a series of operations such as masking, photolithography, doping, metal deposition, etc. in the future, at that time in China, the transistor was learned from the Russians. The transistor was not obtained by multiple doping on a silicon wafer or germanium wafer to obtain a PNP junction or NPN junction. Instead, it looked like several pieces of differently doped raw materials were stacked together to obtain a PNP or NPN junction.

Although this technology is still used in the future, if you want to use it in integrated circuits, then you are obviously thinking too much. Although the first integrated circuit in 58 was not much better, at least it did not play this simple and crude stacking game. Although it looks ugly, it still uses the planar transistor technology. After all, one of the symbols of integrated circuits is this technology.

It seems that there are still a lot of things to do.

This brings us back to the most common topic when we were arguing with each other online in our previous lives - photolithography machines.

A photolithography machine is a must; it is the most important process. Without it, other technologies such as CVD, PVD, gas diffusion, evaporation, and doping will become meaningless.

In principle, photolithography technology can be used to perform operations such as doping, etching, wire connection, and forming working structures in designated areas.

Strictly speaking, it is wrong to say that "the photolithography machine carves out circuits on silicon wafers". Photolithography itself cannot carve out PN junctions or form circuits. Photolithography only provides a condition for the production of PN junctions, wire connections, and internal components as required. What it carves out is the prototype of the circuit and provides protection.

It's a bit like when we spray paint a workpiece, we will use newspaper to protect the parts of the workpiece that don't need to be painted, that's all.

But without this protection, the result is like spraying paint on a workpiece without covering it with newspaper. No matter how good the control is, it will spray to unwanted places and the workpiece will be ruined, not to mention making a temple in a small snail shell like a silicon wafer.

However, as for the lithography machine, Gao Zhendong doesn't even think about ultraviolet, extreme ultraviolet lithography, immersion lithography, multiple exposure and other such shit. The entire technical environment cannot support them at all.

What he wanted to do was to use a ready-made thing that he had made with his own hands - laser lithography. As for the lithography process, he didn't even think about how many nanometers there were, and even the micron level was too high.

For him, even the sub-millimeter level would be enough, that is, the level of 100 microns to 10 microns, which means that a dozen or even dozens of transistors can be placed on an area of ​​1 square centimeter.

Don't underestimate this density, it can already do a lot of things, especially for DJS-60D and even the second-generation high-performance computer he is planning.

And everyone who works with digital circuits knows that with the right digital circuit chips, even without a computer, they can do a lot of fancy things and achieve many control needs at a simple cost.

For this process precision, the wavelength of any laser is small enough and the power is relatively easy to achieve.

As for the extreme ultraviolet lithography machine, that is because the lithography process needs to be small to a certain extent, and the power is difficult to increase. Thinking about that thing at this time is completely a dream.

As for whether submillimeter precision lithography can be achieved, Gao Zhendong still has some confidence. At worst, he can ask the relevant units to make a few sets of optical path systems and he can provide the light source himself. He knows more than just ruby ​​lasers.

As a senior military fan in his previous life, he knew very well that the Northeast Institute of Optics was not just a place to do nothing, but a very powerful entity.

Moreover, originally speaking, China's integrated circuits actually started not too late. Contrary to the common people's intuition, our first integrated circuit was born in 1965, and the practical semi-automatic proximity lithography machine was born in 1977. This is a lithography machine with a resolution of 2.5 to 5 microns. The successful imitation of the 8080 CPU was in 1979, one year earlier than the Hans cat. In general, its technical level is about 4 to 7 years away from the most advanced. As for how it became a mess in the following decades, it is unknown.

In short, the conditions in China are basically mature at this time when it comes to developing integrated circuits.

Gao Zhendong quickly set his first goal, a submillimeter proximity lithography machine, but he still needed to consider carefully the specific method.

Moreover, integrated circuits involve more than just photolithography. There is much more to it. Fortunately, most of them can be handed over to Factory 1274 after planning. They have the experience and ability in this. The only troublesome thing is the photolithography machine.

The sub-millimeter level of precision determines that this task can be done well overall. If you want to take it one step further and make something that counts in nanometers, you will have to wait until the end of time.

After an in-depth discussion with Director Lu and Chief Engineer Lu, he said, "Director Lu, Chief Engineer Lu, let me digest these materials carefully and then come up with a specific plan."

The two men also knew that this step could not be skipped and had no objection. After agreeing with Gao Zhendong on the time for the next step of work, they left the third rolling mill, leaving the materials behind.

After returning home, Gao Zhendong continued to write and draw on paper after dinner, thinking about this problem. Although the semiconductor technology at that time was not as complicated as it is in the future, there were still many things to consider.

Seeing that he was busy, Lou Xiao'e didn't say anything. Her exam was coming up soon, and she was also busy.

The couple, one writing the plan and the other reviewing, can be considered another form of harmonious relationship, and their life is peaceful and quiet.

At a small dock on Hong Kong Island, a batch of cargo was loaded onto several small boats, which left the shore and rowed towards the distance.

Under the dark night, on the distant sea, a small command tower was looming on the water. The sea water was rushing through the rows of water holes below the command tower, making a gentle "gurgling" sound.

On the shore, a comrade shook the hand of another young man and said, "Comrade, after this batch, there is no need to transport it over there for the time being. My family has found a more reliable and open channel. You don't need to take this risk for the time being. You can use it yourself or store it for the time being."

The young man smiled and said, "There is no risk actually. I always have normal production losses."

The comrade smiled and said, "Then reduce the loss and increase the profit margin. Your existence is very meaningful to the family. You still have to protect yourself when it is not necessary."

The young man nodded. "Okay, I'll make the arrangements. Is everything okay at home?"

"Very good, don't worry. Your sister will take the exam soon, you know that, but what you don't know is that she seems to have good grades and should be able to go to a good school. Your parents will also be relieved, especially your mother."

The young man seemed to know his mother's character and chuckled.

"As for the other person, I don't need to say anything. If I say anything, it will be a violation of discipline, haha."

The young man smiled. Needless to say, that person was doing well. Even his family was doing well now because of him. “You don’t have to tell me about that. I don’t dare to ask.”

The two of them laughed and said nothing.

The comrade on the other side said, "By the way, I suggest that if it is convenient for you, you can go to the other side of the big bay and deploy some people as well. Having more nests is always a good thing."

The young man thought about it and frowned: "Opposite? That place is famous for spinach. There is no point in me going there."

Obviously, compared with the fierce competition in the business world, the decadence and debauchery there has no appeal to young people. You should know that the decadence and debauchery there is even far beyond that of Hong Kong Island. People in Hong Kong Island regard it as a den of money.

"But the other side is not affiliated with this place for the time being. Maybe it can be useful in some cases. Moreover, the temporary government on the other side has a very subtle mentality. Maybe it can better protect you in some cases."

The young man smiled and said, "I understand. I will pay attention to it and make arrangements later."

The comrade was very satisfied that the young man listened to his advice: "That's good, I'm leaving now."

After saying that, he waved his hand, turned around, jumped onto the last small boat, and headed towards the command tower half exposed on the sea in the distance.

(End of this chapter)