Chapter 320 The most common topic on the Internet in the past life
Yu Yuncheng admitted Gao Zhendong’s words. Looking at the current attitude of the ministry, to put it more exaggeratedly, even if he just wrote his name and the amount, The probability of approval from the ministry is also very high, let alone such a trivial matter as there is no specific process, the problem is solved by simply requiring confidentiality.
The main thing is that they can deliver the goods. This is harder and more convincing than anything else. Not to mention the recent achievements of adding silicon monocrystalline to monocrystalline furnaces, the department is very satisfied.
Yu Yuncheng also wanted Gao Zhendong to be the shopkeeper and let him write the materials. This is first-hand information. Anyone who can't afford it wants to take over? You are so beautiful. Don't even give me a glance, okay?
While Yu Yuncheng was happily running to do coolies, Gao Zhendong also welcomed another group of guests.
——Director Lu and Chief Engineer Lu of Factory 1274.
These two are a little impatient. As soon as the single crystal furnace is completed, they can't wait to defeat the 1218 factory, which is watching eagerly. They will carry out semiconductor process research under the leadership of Gao Zhendong. Received it.
This time, I came here to report the results of the preliminary in-factory resource survey to prepare for the next step.
Gao Zhendong warmly received the two men and carefully studied the current situation of the 1274 factory they brought.
As one of the factories directly supported by Da Maozi, Factory 1274 undoubtedly represents the highest level of domestic semiconductor technology. From their situation, we can clearly understand the domestic semiconductor manufacturing technology.
After seeing the situation in Factory 1274, Gao Zhendong was a little scratching his head. This factory really produces transistors from the ground up, and it uses a relatively primitive production process.
Let's put it this way, a piece of silicon wafer a few millimeters square can be used to make a CPU on it in the future, but in most semiconductor factories at this time, it is only enough to make a triode, or even half a transistor. .
Different from a series of operations such as masking, photolithography, doping, metal deposition, etc. in the future, at this time in China, transistors were learned from Da Maozi, and transistors were not passed through many times on a silicon wafer or a germanium wafer. Doping results in a PNP junction or NPN junction, but it looks like stacking several different doped raw materials together to get a PNP or NPN junction.
Although this technology will be used in the future, if you want to use it in integrated circuits, you are obviously overthinking it. Although the first integrated circuit in 1958 was not much better, at least There is no such simple and crude game of Jenga. 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 quite a lot of things to do.
This goes back to the most common topic in previous lives when we were trolling each other on the Internet - lithography machines.
A photolithography machine must be installed. This is the most important process. Without this, other technologies such as CVD, PVD, gas diffusion, evaporation, and doping will lose their meaning.
In principle, through photolithography technology, operations such as doping, etching, wire connection, and formation of working structures can be achieved in designated areas.
Strictly speaking, it is wrong to say that "the photolithography machine carves circuits on the silicon wafer". Photolithography itself cannot carve PN junctions, nor can it form circuits. Photolithography only provides a condition for the production of PN junctions, wire connections, and internal components as required. What it carves is the prototype of the circuit and provides Protect.
It's a bit similar to when we spray paint a workpiece, we use newspapers to protect the parts of the workpiece that don't need to be painted, and that's it.
But without this protection, the result is like spraying paint on a workpiece without a newspaper cover. No matter how well you control it, the spray will go to unnecessary places, and the workpiece will be useless, let alone the small snail shell of the silicon wafer. It’s time to do a dojo.
But as for lithography machines, Gao Zhendong doesn’t even think about ultraviolet, extreme ultraviolet lithography, immersion lithography, and multiple exposures. The entire technical environment cannot support them at all.
What he wants to do is to use a ready-made thing made by himself - laser lithography. At the same time, he doesn't even think about the number of nanometers in the photolithography process, even the micron level is too high.
For him, it only needs to be at the sub-millimeter level, that is, at the level of 100 microns to 10 microns, and he can put a dozen or even dozens of transistors 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 engages in digital circuits knows that with the appropriate digital circuit chip, even without a computer, you can do a lot of tricks 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 it is difficult to increase the power. At this time, thinking about that thing is completely a dream.
As for whether sub-millimeter precision photolithography can be achieved, Gao Zhendong still has a certain degree of confidence. At the worst, he can ask relevant units to develop a few sets of optical systems and just install the light source himself. He does not only know ruby lasers.
As a senior military fan in his previous life, he knew very well that the Northeast Optics Institute was not just for free, it was a pretty awesome existence.
And originally, domestic integrated circuits actually started not too late. Contrary to ordinary people’s intuitive reactions, our first integrated circuit was born in 1965, and a practical semi-automatic proximity lithography machine was born in 1977. In 2008, this was a photolithography machine with a resolution of 2.5 to 5 microns. The 8080 CPU was successfully copied in 1979, one year earlier than Hanscat. Generally speaking, its technical level is about 4 to 7 years away from the most advanced. It is unknown how it got to that point in the following decades.
Anyway, if you want to develop integrated circuits, the domestic conditions at this time are basically mature.
Gao Zhendong quickly set his first goal, a sub-millimeter proximity lithography machine, but he still had to think carefully about the specific method.
And integrated circuits are not just about photolithography, there are many more. Fortunately, most of them can be handed over to the 1274 factory after planning. They still have the experience and ability to do this. The only troublesome thing is the photolithography machine.
The sub-millimeter level of accuracy determines that this matter can be done well in general. If you want to achieve success in one step and use nanometers to count, you have to wait for a long time.
After having an in-depth exchange with Factory Director Lu and Chief Engineer Lu, he said: "Director Lu, Chief Engineer Lu, let me digest these materials and then come up with a specific The plan is coming. "
The two also knew that this step could not be omitted, and they had no objection. After making an appointment with Gao Zhendong for the next step of work, they left the materials and left the third rolling mill.
After returning home, Gao Zhendong continued to write and draw on paper after eating, just thinking about this issue. Although the semiconductor technology of this year is not as complicated as it will be in the future, there are still many things to consider. .
Lou Xiao'e didn't say anything when she saw him busy. Her exam was coming soon and she was busy too.
One of the couple writes a plan and the other does review, which can be regarded as another form of harmony, and the years are quiet and peaceful.
On Hong Kong Island, at a small pier, a batch of goods was loaded onto several small boats. The small boats left the shore and rowed away into the distance.
Under the dark night, on the sea in the distance, a small control tower loomed on the water. The sea water washed through the rows of water holes below the control tower, making a gentle "swishing" sound. .
On the shore, a comrade shook the hand of another young man: "Comrade, after this batch is passed, there is no need to transport it there for the time being. The family has found a more reliable open channel. For the time being, You don’t need to take this risk anymore. You can use it for yourself or keep it temporarily.”
The young man smiled and said: “Actually, there is no risk. I always have normal production losses.”
The comrade smiled and said: "Then reduce losses and increase profit margins. Your existence is very meaningful to the family. You should protect yourself when it is not necessary."
Young people Nodding: "Okay, I will make arrangements. Is everything okay at home?"
"Very good, don't worry, your sister is about to take the exam. You know this, but you don't know What's more, she seems to have good grades and should be able to go to a good school. Your parents are also relaxed, especially your mother."
The young man chuckled as if he knew his mother's virtue.
“As for the other person, I don’t need to say anything. What I said is against discipline, haha.”
The young man smiled. Needless to say, that person is doing well. Even the family is doing well now, all because of him: "You don't need to say that, I don't dare to ask."
The two of them laughed. With a smile, everything goes without saying anything.
The comrade on the opposite side said again: "By the way, I suggest you go to the opposite side of Dawan if it is convenient and arrange some people. It is always a good thing to have more nests."
Young The man thought for a while and frowned: "Across the way? It's famous for spinach over there. It's not interesting for me to go there."
Obviously, compared to the fight in the sea of business, for young people, the life and death there is It's obviously not attractive. You have to know that the people in that place are even more luxurious than those on Hong Kong Island. People on Hong Kong Island use it as a gold-selling cave.
"But the opposite side and here are not the same family for the time being. Maybe it can be useful in certain situations sometimes. Moreover, the temporary government opposite has a very subtle mentality. Maybe it can better protect you under certain circumstances."
The young man smiled and said: "I understand, I will pay attention to it, and I will make arrangements later."
The comrade was very satisfied with the young man's advice: "That's good, I'll go ”
After that, he waved his hand, turned around and jumped into the last boat, heading towards the control tower half exposed on the sea in the distance.
(End of this chapter)