Siheyuan: Starting from a fitter

Chapter 219 Production line debugging completed

The production line is being installed and debugged, and Li Guocheng will inspect the installation progress and quality every day.

What Li Guocheng must now solve is the yield rate in the chip manufacturing process.With Robin Hood's method of operation, it's a blessing that the yield can reach 50%.

"Mr. Chairman, our Robin Hood country's equipment is very advanced, and the yield rate has always been controlled above 40%, which is the best indicator at present." When the debugging engineers drink too much, they will show off their skills.

Li Guocheng is too lazy to complain. Only now does he know why the cost of transistors is so high now.

Lithography machine technology is divided into the following categories:

Contact Printing: The mask is in direct contact with the photoresist layer.The exposed graphics have the same resolution as the graphics on the mask, and the equipment is simple.Contact type, according to the way of applying force, is divided into: soft contact, hard contact and vacuum contact.

Proximity Printing: There is a tiny gap (Gap) between the mask and the photoresist base layer. The Gap is about 0 to 200 μm.It can effectively avoid mask damage caused by direct contact with the photoresist, so that the mask and photoresist base can be used for a long time; the mask has a long life (can be increased by more than 10 times) and has fewer pattern defects.Proximity type is the most widely used in modern photolithography processes.

Projection Printing: Using an optical system to collect light between the mask and the photoresist to achieve exposure.Generally, the size of the mask will be 4 times the size of the pattern to be transferred.Advantages: Improved resolution; easier production of masks; reduced impact of defects on the mask.

What is currently used in China is the projection exposure method, and attempts have been made to process processes below 5um.The processing accuracy of this production line is 100um.The gap is too big.

Forget it, we are not going to process integrated circuits yet, let’s make transistors first.

But now the yield problem must be solved. There is no way to directly use microcontrollers. Li Guocheng can only go back to the original era and build control circuits with independent transistors.

Fortunately, the principle is very simple. It only took Li Guocheng half a day to complete the disassembly, cutting and design, using a total of more than 1200 independent transistors.

Then we commissioned the production of a 1 meter square epoxy resin copper-plated plate, and used the modified rotor to start making device soldering holes.

The circuit is completed directly with a carving knife, and the final circuit board is 300*500mm in size.The next step is to wait for the transistors to be obtained during trial production on the production line, and then complete the welding.

The mechanical department commissioned the production of high-precision screws and purchased enough stepper motors.

When doing the above designs, Li Guocheng felt very uncomfortable. He could have completed them all, but in order to avoid suspicion, almost all parts were commissioned and purchased.

Forget about other parts, the accuracy is a bit low, the cost is a bit high, and the efficiency is a bit low, it’s all acceptable.

Li Guocheng was busy that day, and Mr. Tang, the chief consultant, came to visit.

"Mr. Cheng, how are you? Did the installation of the production line go smoothly?"

"Everything is going well, but the official start of construction is expected to be delayed by a month."

"Ah, why?"

"I need to fine-tune the production line. The current manufacturing cost is too high, the yield is too low, and the cost advantage will not be obvious by then."

"Ah, do you know about the production line? Don't break it." Consultant Tang was obviously unsure.

"Don't worry, I only use micro-control of the moving parts of the lithography machine to reduce manual errors and losses and will not affect the operation of the production line."

"Does it mean changing a link in the production line from manual operation to machine operation?"

"Consultant Tang's summary is in place," Li Guocheng couldn't help but give a thumbs up.

"That shouldn't be a problem. At worst, we can go back to manual work, right, Mr. Cheng?"

"Completely correct".

"If the transformation is successful, how much will the yield rate increase?"

"It is expected to increase to 60%, which is 2 levels higher than the current level."

Li Guocheng is already very conservative. His goal is 80% to 90%. After all, he has mature domestic experience.Although advanced domestic photolithography machines cannot be copied, the control accuracy can be improved.

At the same time, because it is a manual operation, the loss of wafers is relatively large.Using automatic control, losses can be reduced to a minimum, which in turn reduces costs.

Consultant Tang left the company with the good news, and Li Guocheng returned to the laboratory to continue making production line modification components.

During the debugging by professional Robin Hood engineers, the time entered mid-April.

The first trial production was very successful, producing transistors that met the requirements.But the yield is surprisingly low, only 26%.

"Mr. Chairman, there is no way around this. If our Robin Hood engineers operate it, we will definitely be able to achieve a yield of 40%. But you must insist that your workers do it themselves."

These engineers are proud. They are not worried at all that Li Guocheng will not pay the balance because the use of all funds is controlled by HSBC.

Li Guocheng did not complain. Accompanied by Consultant Tang, he had a celebration banquet with these Robin Hoods and sent them off with gifts.

In Li Guocheng's office, Chen Yuhe served tea to his boss and Ma Yong and left.

"Lao Ma, you have been working hard at this stage recently. You led the Robin Hood team to learn, and now you are supervising the installation and debugging of the production line."

"I should! Although it's a bit tiring, it really opened my eyes. Thank you boss for giving me this opportunity."

"You have such a good understanding. After I communicated with Manager Chen Li, I think you handed over the property to someone else, and you are in charge of the semiconductor business department. How about it?"

"There is no problem. It is both a challenge and a test for me. I will try my best."

"Okay. Semiconductors will be our main business in the future, and Mr. Chen and I are very optimistic about you."

"Actually, it's like a dream now. The company has trained me and given me opportunities. As long as the company needs me, I will always be with the company."

"Okay! Okay! Okay! I saw you right."

After seeing off the excited Ma Yong, he called Chen Li.

"Aaron, is it settled?"

"It's settled, you can sit down."

Li Guocheng brought a new tea cup, boiled it with hot water, filled it with tea and handed it to Chen Li.

"Now Longhua Technology has two business departments, and its staff has gradually grown. In order to retain talents in the future, you have to think of ways to motivate them."

"Aaron, what do you think?"

Li Guocheng took a picture of Chen Li's plump buttocks and said, "You are the general manager. You have to think carefully. Have you gained weight at this stage of training?"

Chen Li rolled her eyes and said, "Okay, my chairman."

"Please summarize the company's current operating conditions and status quo. Although Brother Hua has left it alone, we still need to communicate with him. If your incentive measures are completed, we will discuss it with him by the way."

"Okay, it's all up to you."

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(End of this chapter)