NOVEL SIMPLE Chapter 192
Chapter 192 MOCVD
The weather is getting warmer day by day.
In addition to studying, Cheng Yongxing has a new job, which is to chat with him.
Every day, he has to spend an hour or two, staying in front of the telephone, and discussing with the technicians in the distance.
In the era without the Internet, fax and telephone are the most advanced communication tools.
The few drawings taken by Keyi are the design sketches of MOCVD.
The full name of MOCVD is metal organic compound chemical vapor deposition. This Chinese name is actually more difficult to understand than the English name.
There are too many terms involved, including keywords such as gas phase, extension, etc., each of which is enough to exist as a discipline.
The principle of this thing is very complicated to explain, but the actual reaction process is not complicated. The whole process is similar to electroplating, but the medium is not liquid, but gas.
If you have to explain it, it is that in a special environment, two gases chemically react in the air, and the reaction product will be adsorbed to the surface of the heated object, and then be solidified to become a part of the surface of the object.
Let’s find a video to watch. In words, um, it can be 10,000 words, but it’s not clear.
This equipment is a key node in the production of blue LEDs and has many advantages: the equipment is simple; the reaction gas can be accurately adjusted; the thickness of the film can be accurately adjusted; low-pressure epitaxial growth can reduce unintentional doping; the film is larger and more uniform , Suitable for mass production, etc.
No technology is created out of thin air. The predecessor of MOCVD is vapor phase epitaxial growth (VPE). The current VPE technology is only available in the United States, and it is a kind of embargoed technology.
Therefore, from a common sense, China will never have MOCVD soil.
The reason why Nakamura succeeded was that it imported a VPE from the United States. On the basis of this equipment, he carried out a transformation and finally built his own MOCVD.
————————
The reason why Cheng Yongxing knows about this technology mainly comes from the product advertisements of some manufacturers. These technologies belong to the protection of patents, so they generously made the technologies into animations, videos, and promoted them everywhere.
The technical content of MOCVD is high, quite high, otherwise this equipment will not appear in the embargo list.
But is it really difficult to manufacture?
Sometimes, being famous is not a good thing. If the blue LED did not win the Nobel Prize, nothing would happen today.
It is the controversy and storytelling of blue LEDs that make related popular science articles overwhelming.
When he heard the news about the blue LED Nobel Prize, Cheng Yongxing looked at the design sketch of this thing and a bunch of manufacturer promotional videos. He looked left, right, front, and back. He just didn’t understand this thing. , Why is it worth the embargo.
This thing, at best, is a high-temperature reaction vessel.
Especially when continuous production is not considered, the structure is simpler. This thing is obviously not of the same order of magnitude as the required technical parameters of the large chemical projects currently under way, the equipment used and the tanks and tanks.
The Jiangsu and Zhejiang generation, a large number of LED companies, all use domestic equipment, don’t they also use it well?
Just search, there are a lot of papers on MOCVD on the Internet.
Countless people have obtained Ph.D. and master’s degrees through this thing. And this trend has shifted to undergraduate thesis.
Does it really complied with that sentence?
What can be copied as long as it is looked at by Rabbit’s omnipotent copycat factory?
If this is the reason, it should be embargoed.
Perhaps the biggest obstacle to the development of China’s semiconductor equipment technology is not just manufacturing technology, but also a large number of patents.
Many technologies have been registered by others, and you can’t use them if you see them!
————————
However, there is another interpretation: difficulty.
The reason why Nakamura was able to make a breakthrough in LED technology is that he creatively used the heating technology inside the cavity. This makes the manufacturing technology of the entire reaction chamber, reaction control, etc., the difficulty has been exponentially reduced.
Before this process improvement, the reaction chamber, even the piping and the gas outlet, were all quartz. Compared with the easy processing of metals, the difficulty of using quartz as a high-temperature reaction vessel can be imagined.
It was this improvement that led Nakamura to complete the next work independently with his own ability.
At this moment in time, the same improved technology has also brought the Chinese people the possibility of overtaking in curves.
————————
The content in these propaganda videos and the content reported by the news were used by Cheng Yongxing, and they were continuously transmitted thousands of miles away via telephone and fax.
The design sketch this time is based on these public information.
As for the details of the heater Nakamura used, he really didn’t find out. The Japanese strategy is to produce and sell. They make their own processing equipment and produce their own products, so they will not release the detailed design of the production equipment to the outside world.
Especially for the details of the heater, Cheng Yongxing searched for information for a long time at that time, only to find, “Top Secret in Top Secret”, this weird wording.
What’s so top secret about this? Just grab a postgraduate thesis and it’s everywhere.
The students of later generations also worked hard for an essay, and the various proposals they put forward were strange and strange.
In a sense, the current competition between the two parties is also a competition between two processes and two technological routes.
Both sides are running desperately forward. Rebirth of Northland Technology latest chapter address: https:// /book/128175.htmlRebirth of Northern Science and Technology Full Text Reading Address: https:// /read/128175/Rebirth of Northland Technology txt download address: https:// /down/128175.htmlRebirth of Northland Technology Mobile Reading: https://m. /read/128175/For the convenience of reading next time, you can click “Favorites” below to record the reading record of this time (Chapter 192 MOCVD), and you can see it next time you open the bookshelf ! If you like “Rebirth of Northland Technology”, please recommend this book to your friends (QQ, blog, WeChat, etc.), Thank you for your support! ! ( )