Civilization Template

Chapter 154 Blu-ray

Chapter 144 Blu-ray——
Fengtian, night, Keyi canteen
Liu Minxue, the director of the factory, carried the prepared meals and inspected the place.

It has been a long time since the Instrument Factory has such a lively scene.

When the factory was in recession some time ago, not to mention dinner, even during lunch time, there were not many people, because many people went home on vacation.

The order of Songhuajiang Semiconductor is not high due to the limited output and parameters, but the quantity is relatively large.

Due to the different structures of MEMS sensors, in order to prevent quality fluctuations caused by constant adjustment of equipment parameters, basically each sensor needs to have an independent production line.

The price of domestic equipment is not high, and the customized development fee is reimbursed by the special national subsidy, so Songhuajiang Semiconductor has ordered seven or eight production lines in one go.Correspondingly, it is the same or similar equipment, and one purchase is seven or eight.

The centralized delivery of this batch of equipment has restored Keyi to its long-lost prosperity.

Satisfied, Liu Minxue walked around the cafeteria and stopped in front of Wang Qingshan's desk. "How is the debugging of your MOCVD?"

"It went well, very well."

"What's the smooth way? Didn't you say a few days ago that there are many parameters of MOCVD, and it will be very difficult to debug?"

"Yeah. I also find it strange. As soon as Chen Quan came and adjusted it a few times, the production of GaN stabilized. So, our debugging work is basically over."

In fact, before Chen Quan came, Wang Qingshan had already organized people to conduct joint debugging on the equipment, otherwise he would not dare to send a message and invite customers to come to participate in the final debugging.

The dual air flow structure looks simple, but the relationship between the two nozzles, the air volume, wind speed, angle and other variables of each nozzle are quite a lot, and any problem with any one will affect the final result.Wang Qingshan adjusted himself for two days, but finally had to give up.

"You mean, your MOCVD has been debugged and ready for delivery?" Liu Minxue was surprised. "So fast?"

"correct."

"Wait a minute, wait a moment." Liu Minxue thought for a while and sat down slowly. "I remember you kept saying that with Chen Quan's idea, the resulting GaN will have crystal defects in the end, and there is no way to use it in practice, right?"

Due to equipment reasons, Keyi Factory has done some related research on blue LED technology.

The substrate material used in blue LEDs is not the common silicon wafer in ICs, but sapphire with a crystal structure close to that of GaN but with a mismatched lattice constant.

Due to the lattice mismatch, there is a mismatch stress between the GaN epitaxial layer and the sapphire substrate, and the release of the stress will cause a large number of defects inside the GaN.Such material is useless.

"Yes, I said it. But the problem of crystal defects is not discovered by me. It is a recognized problem on the road of blue LEDs."

"Of course I know that you didn't discover the problem." Liu Minxue patted the table with his hand. "But crystal defects, did they happen?"

"We have also encountered the problem of crystal defects." Wang Qingshan spread his hands. "But the problem was solved by Chen Quan."

"Solved? How did you solve it? Who solved it? Did you modify the equipment? Why didn't I receive the modification notice?"

Liu Minxue felt that he hadn't paid attention to it for only two days, and so many things happened in the MOCVD project team.

"Chen Quan did not modify the equipment, but modified the process steps. He used a two-stage heating method. First, a layer of GaN was formed at a lower temperature. Then the temperature was raised to the normal 1000 degrees. Because the stress will The GaN layer is released, and the resulting high-temperature GaN has no problem with the crystal quality."

"It's that simple? Use low temperature first, then high temperature?"

Liu Minxue couldn't believe his ears. The problem of GaN lattice defects is very famous.However, Chen Quan's plan neither increased equipment nor cost.

"Yes, it's that simple."

Wang Qingshan pouted. "To be honest, I still have the unreal feeling of dreaming. After Chen Quan came, he started to operate directly. He gave me the feeling, how should I put it, as if he often used this MOCVD. But this equipment, obviously we produced."

"After all, he designed the equipment, and his operation is more proficient than the production staff, which is normal." Liu Minxue didn't care. "Then what are you going to do next? Check and sign directly and collect money?"

"Not yet." Wang Qingshan shook his head. "Chen Quan said that he would organize an actual production of blue LEDs to verify the crystal quality of GaN."

"How is this possible?"

Liu Qingshan exploded when he heard it. "How can the acceptance of MOCVD be bundled with blue LED? At most, we can issue a GaN test report to him, which is based on our confidence."

"Yeah, that's what I said too. Because everyone on the earth knows that blue LEDs have a long-standing problem of p-type junction doping failure."

Wang Qingshan shrugged. "But he persisted."

"That's up to me! I'll go find you tomorrow. We are equipment manufacturers, and we are only responsible for the equipment. Not to mention, he designed this equipment himself!"

(End of this chapter)