The ups and downs of life in the Siheyuan

The following days were relatively leisurely, of course, this was for Li Yuan himself.

Those people in the underground laboratory simply couldn't stop. They were very motivated and worked overtime.

Some people are studying the preparation process of single crystal rods with larger sizes, and the leader is Huang Yan.

Some people are studying photolithography machines and etching machines. This is Li Yuan's later plan, and the plan will not start until next year.

Senior Brother Gong couldn't wait for a moment, so he led four people to start research on photolithography machines and etching machines.

The last group of people, studying packaging and measurement technology, is jointly responsible for Teacher Ai and Teacher Bi.

Originally, he wanted Senior Brother Gong to be responsible for the research on special chips, but unfortunately he was more interested in photolithography machines and etching machines.

Speaking of lithography machines, the birth of lithography technology is actually earlier than chips.

In 1955, Bell Labs realized the method of using photolithography to process electronic components on silicon wafers.

In 1958, when an engineer from TI was on duty at the company, he had a sudden idea: Why not make all electronic devices using the same semiconductor material?

In this way, they can be concentrated on a small semiconductor chip and connected to each other to make extremely small micro circuits.

Although it was just an idea, TI quickly applied for a chip patent.

In 1961, GCA built the first repeat-exposure lithography machine, which was film-coated and could position with an accuracy of 1 micron.

It is like a woman making a facial mask, directly covering the graphics on the oxide film.

However, the disadvantages are very obvious. The mask is disposable and will also contaminate the wafer.

Li Yuan's idea directly chose the projection lithography machine of later generations.

Two concave spherical lenses are added between the mask and the silicon wafer. The pattern distortion caused by one spherical lens can be corrected by the other spherical lens.

This not only avoids the contact between the mask and the silicon wafer, but also achieves the effect of shrinkage printing.

The light source of early lithography machines was visible light. Based on the tips in the skill book, Li Yuan chose the currently achievable technology, ultraviolet light generated by high-pressure mercury lamps.

If completed, this will be a true lithography machine and the predecessor of the DUV lithography machine that will be widely used in later generations.

As for EUV, he had only heard a name and it was not mentioned in the skill book.

How to develop, Li Yuan also gave a solution, which is to let them study the current photographic development technology.

While discussing development with Brother Gong, Li Yuan suddenly thought of a new project, which was circuit board manufacturing.

This has a long history of application, and the repair shop can rely on it to survive.

Today's electrical appliances do not yet have circuit boards, and are connected directly with copper wires.

For electronic tube appliances, such as radios, this operation will have no effect.

For example, the latest Modu 160A radio is directly connected by soldering.

However, this process is very unfriendly to future transistor devices.

The manufacturing process of circuit boards is actually similar to that of photolithography machines.

Therefore, Li Yuan forced Senior Brother Gong and his team to study circuit board manufacturing technology first.

After arranging everything, Li Yuan lived a leisurely life.

Occasionally, I go to flirt with my future wife, Miss Yang Ting.

Or stay in the concierge and drink with Uncle Song.

Went home at night and started digging into the basement.

For safety, Li Yuan first dug a 5-meter shaft downwards, and then started digging into the basement.

The plan is a trapezoidal cave dwelling with the same shape as the east wing, like the pyramids of Egypt.

The solid wood shelves in the space were dismantled and used as supports for the trapezoidal slopes.

With the help of space, this step is very fast.

It only took two days to complete the excavation of the trapezoidal space.

All the soil was collected into the space and then smuggled to the outskirts the next day and discarded.

The next step was to drive wooden piles for the foundation. Li Yuan purchased more than 50 pieces of pine wood that were as thick as a bowl and more than 2 meters long.

Use the space to press these pine logs vertically into the ground.

There are 50 pieces in total, which looks very dense.

The next step is to lay the large stones prepared in the space on the ground. Then it is poured with concrete mixed in the space.

Pre-embed steel bars on the four sides and corners in advance to facilitate later construction of the wall.

He put the small fan in the basement and let it sit for two days. After the water was fully absorbed, he started building the wall again.

This step is relatively simple. Use the space to dig out the shapes of cement pillars at the four corners and the east and west sides.

At the top of the column, dig out the surrounding beams and reinforce the beams.

Wooden boards were placed on the four sides of these posts and beams and fixed for shaping.

Place a tied steel cage in the middle and connect it to the embedded steel bars.

In this way, the frame of a 3-meter-high basement is completed.

After everything is OK, pour the concrete mixed in the space into the columns and beams.

Three days later, a 20-centimeter-thick log was placed on the beam, and all excess soil in the basement was dug out.

A layer of concrete was then poured over the logs.

The current conditions are limited, so this can only be done. When conditions are mature in the future, these logs will be replaced with reinforced prefabricated panels.

A wall of red bricks is built around the column, and a layer of reinforced concrete one brick thick is poured inside the red brick wall.

In this way, a basement with a length, width and height of 5*4*3 cubic meters is completed.

The wooden stairs leading up and down were rebuilt, and the entrance and exit were placed in the storage room.

The entire project took less than two weeks and was completed by one person.

If there is no system space, it will take a lot of time and manpower to build a basement, and safety may not be guaranteed.

It will also increase the risk of exposure.

There was so much soil and so much material that it was impossible to hide it from the neighbors in the yard.

The problem is that he works during the day, occasionally dates Yang Ting after get off work, and has to dig the basement at night.

The three things were all arranged properly.

At this time, he only slept for 3 hours a day, and then took two punches in the morning. All physical and mental fatigue disappeared.

Sometimes, he also laments that since he got the exercise, he regards it more as an activity to strengthen his body.

Even though he got a lot of benefits, he didn't dig deep. The important thing is to be casual.

This is said to be obtained by martial arts enthusiasts and is not allowed to be studied every day.

Maybe some powerful people can use this to achieve the goal of cultivating immortals.

It's a pity that when the technique came into his hands, it was used more as an auxiliary tool for scientific research. It can be said that it was a secret investment.

The only thing that can be commended is practicing every day, rain or shine.

Leaving the small fan in the basement, Li Yuan's next plan is to complete the production of the vacuum furnace control chip.

At present, it can only be done using the engraving knife in hand. If you want to use a photolithography machine, you still don’t know how to do it.

This is nothing to be ashamed of, as all transistor production is currently done manually.

With superb carving techniques and mind control, he can design transistors, resistors, and capacitors into smaller sizes.

In this way, for the same circuit, due to the reduction in device size, power consumption will also be reduced simultaneously and less heat will be generated.

If the research on photolithography machines is successful, smaller devices will be obtained through the lens microcosm effect.

By then, the conditions for making chips and CPUs will be available.