Siheyuan: Starting from a fitter

Chapter 129 The first industrial chip
Li Guocheng applied the photoresist on the oxidized wafer, fixed the center of the wafer with a partial vacuum suction cup, lifted it up, put it in the palm of his hand and turned it gently, using centrifugal force to evenly cover the entire plane with the photoresist.

After completing this step, Li Guocheng secretly decided to build a glue-slinging machine after the experiment was completed.I also turned it by hand to remove the glue, which was too low.

But in the eyes of outsiders, every movement of Li Guocheng is very confident, easy to handle, and has a hidden rhythm.This may be the benefit of long-term modification, and I installed a big X inadvertently.

Because the photoresist applied is too thin, it will dry out after leaving it alone for more than ten minutes.

Taking advantage of this gap, Li Guocheng walked to the lithography machine, placed a wafer of the same specifications on the base tray, adjusted the focus again to the best state, and then turned the handle of the purple light part to simulate UV light engraving on the wafers one by one. Square grid to determine the best walking distance and the most economical photolithography distance.

After completing countless simulations, various parameters were memorized in my mind.

When I came to the wafer just now, I used my telekinesis to check that the photoresist was completely dry.Pick up the wafer with your hands wearing rubber gloves, place it in the tray, and secure it on all sides.

Turn on the ultraviolet light, and the pattern on the mask plate is clearly engraved in the designated square. After waiting for 9 minutes, in the power of thought, the chemical reaction of the photoresist under the ultraviolet light irradiation is completed and solidified.This ensures that the portion of the wafer covered by the photoresist is retained during etching.

Turn off the purple light, take out the wafer, and observe it with a magnifying glass.In fact, this step is for outsiders to see, it is just a look.In fact, under Nianli's investigation, it has been determined that the photolithography machine and photoresist have met the design expectations.

Re-fix the wafer and engrave squares one by one in order from top to bottom and from right to left.The engraving of 32 radio-specific chips was completed in a short time.

Remove the wafer, come to the etching machine, and first immerse it in the first liquid tank. This time, based on the verification data, wait for 30 minutes and then extend it for 2 minutes before taking it out.

In fact, the entire process was monitored by Li Guocheng's telekinesis, and the 2 minutes of extension were adjusted by him based on the current situation.

Zhou Xiaojuan, who was recording behind the large glass, frowned and said nothing, but just highlighted the time.

Put in the second liquid, this time the time is not adjusted, exactly 12 minutes.

But the cleaning process took 5 minutes longer than the previous process.

The next step is drying, which is just a very simple electric heating wire.Done quickly.

Next came another tedious manual work, but this was the least challenging for the telepathic Li Guocheng. In less than 20 minutes, the ingredients that needed to be mixed were placed at various locations.

In order not to shock the world, Li Guocheng deliberately gestured for another 30 minutes.As for who will be responsible for this process in the future, Li Guocheng can only pray for him.

There is no automatic machine, this job needs to be operated under a magnifying glass, and a little more will be added after repeated confirmation until the requirements are met.Li Guocheng does not use a magnifying glass because he has shown his strong eyesight and control in the past two years.

After confirming again that there are no problems, put the wafer into the vacuum diffusion furnace.

Soon after, Li Guocheng came out with the wafer. Everyone wanted to gather around him, but they were warned in advance, so everyone left a big space.

Li Guocheng pretended to carefully inspect each etched square under an optical magnifying glass and found that only two pieces were defective, and the others were completely in line with the design expectations.

Then he came to the cutting machine and completed cutting 32 chips very skillfully.After Li Guocheng re-adjusted the motor of this cutting machine and manually made the wire saw wire, as long as it was operated properly, the wafer was rarely damaged.

He took out the two defective chips and handed them to Director Li.Seeing his hesitant movements, Li Guocheng hurriedly explained: "It's okay, these two pieces are defective, you can just watch them."

Li Huaide took the chip and handed the other piece to Wu Liankui. Immediately, two people formed a group slightly away from Li Guocheng's workbench. Everyone was interested in knowing the true identity of the chip.

While everyone was playing around, Li Guocheng sat in front of the packaging table, took the DIP-16 mold and base, and started the wiring and packaging work.

After everyone saw the core of the chip, they all looked at Li Guocheng packaging the chip. Although everyone could only see one side, their interest did not diminish.

After the packaging of 30 chips was completed, Li Guocheng called everyone over to pass a piece of defective product. Under the close observation of everyone, he completed the packaging of the chips and finally satisfied everyone's curiosity.

The test is very simple. All the previous processes were monitored by Li Guocheng's mind power. In fact, the test is just a cutscene.

Sure enough, all 30 chips passed the test.

Zhou Xiaojuan was curious and tested the defective products, and all of them met the test specifications.Li Guocheng realized that his standards were set a bit high.

Everyone was immediately interested and all suggested that Li Guocheng complete the packaging of another piece.There is no way, he has denied himself now, how can he refuse.But the result was not ideal and the test failed.

Everyone analyzed together, who had a heavy hand, who touched it with his hand. . . .

"Okay, everyone, be quiet." Li Huaide stopped everyone's argument at the right time.

"Today is a milestone day. It is the first and most determined step in industrialized chip manufacturing in our steel rolling mill. It is also the first chip in China that can be used to serve people's daily life. It marks the direction of our chip technology. Being at the forefront of the world is the best birthday gift to the motherland." Li Huaide spoke louder and louder, waving his right hand more and more powerfully.

Before Li Huaide finished speaking, thunderous cheers and applause came from the dust-free workshop.

"We are at the forefront of the world, no, we will be number one in the world soon." This is the frivolity of young people.

“Our laboratory is so awesome, and Deputy Director Li is so awesome, they didn’t expect us to achieve this,” this was said by a newcomer who didn’t deserve his name.For such a sincere person, should you consider giving him a name?

"In two years, Xiao Li grew up too fast", this is Wang Gong's sigh.

"Should you think about it again?" These were the thoughts of the blushing Zhou Xiaojuan.

"This is the thigh I need to hold tight forever," Yan Jiefang said with firm eyes.

"Lao Li, your son is promising! He's getting old, and now I'm following him," Zhang Tou said with emotion.

. . . . . . .

After most people left, only Li Huaide, Li Guocheng and Wu Liankui were left in the dust-free workshop.

"Old rules, let's all take action. Xiao Li goes to report to Mr. Zhao, Xiao Wu, you go to your old man, and I go to the old leader. This time, none of us can stop the rise of our steel rolling mill," Li Huaide said with confidence Bursting.

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　In fact, chip manufacturing is very complicated, with hundreds of processes. In order to prevent everyone from being upset, we have tried to condense it as much as possible so that non-major book lovers can have a basic understanding.

　　
　
(End of this chapter)