Rebirth of Northern Technology

After entering June, Cheng Yongxing's chat business has become more and more busy.

Due to conditions and the long distance, he had to use the phone to track the progress of the distant place bit by bit.

After experiencing the baptism of MEMS, Cheng Yongxing is no stranger to the use of semiconductor devices.

But now he has come to a brand new challenge.

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The period from 1989 to 1990 was almost the worst time for a programmer.

PC software has just started, and the Internet era has not yet arrived. The domestic software market is still in an environment of enthusiasts. Don't mention it at all in the market. The software used in school computers is free.

But for blue LEDs, this is the best age.

The preconditions for the blue LED invention patents have all appeared in 1989.

In 1989, Takashi Matsuoka of NTT Corporation of Japan invented the method of using nitrogen as a carrier gas to obtain a standard process for the growth of InGaN materials.

In 1985, Akasaki teachers and students invented the "two-step" growth technology to significantly improve the crystal quality of GaN, and then realized the world's first GaN-based p-n junction LED in 1989.

It can be said that in the past few years, blue LED technology has been continuously improving, and it has reached a critical point in time.

But from 1990 to 1993, before the mass production of blue LEDs, for three full years, the entire world became a stage for Nakamura.

At this stage, although others have also gained something. But these gains have all been proven to be on the wrong path!

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During this time, Cheng Yongxing used telephone and fax to remotely control allied forces in the distance, constantly attacking two key hurdles.

These levels are also very famous throughout the history of blue LED gossip.

The first hurdle is the modification design of MOCVD.

After the heater was built in, the design of the entire reaction chamber has undergone earth-shaking changes. The most important thing is that the main equipment material has changed from quartz to metal.

This change is decisive!

It can be said that Nakamura completely designed a different type of MOCVD. Apart from the same name and the same principle, nothing is the same between the two.

This transformation is the starting point for everything.

If it weren't for the freak of Nakamura, maybe the appearance of blue LEDs would have to wait another 30 years!

We can make a metaphor for the difficulty of this matter.

A man who studied integrated circuit design was not satisfied with the accuracy or ease of use of the existing lithography machine, so he designed and manufactured a new type of lithography machine by himself!

Not only can this lithography machine be used! And easy to use, various technical indicators, full of bursts!

Or maybe a doctor who is not satisfied with the current CT scanner and made an NMR scanner by himself!

Through these two examples, everyone can understand how outrageous Nakamura's achievements are.

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Industry specializing in surgery.

With the development of industry and science and technology, the types of disciplines are becoming more and more detailed. As a result of this subdivision, people's knowledge is getting narrower and narrower, and everyone has become a screw on the big machine.

Once a person leaves the big machine of modern society and starves to death in the wild, it is a high probability event.

The elites cultivated by the modern education system, the users of the instruments and the manufacturers of the instruments, are people in two completely different fields.

It is this kind of cross-professional, cross-field, instrument manufacturer that is not so sensitive and understanding to the needs and problems of users. This is also VPE, even MOCVD was born long ago, but only today has it been transformed by Nakamura.

Manufacturers of lithography machines must be very annoyed by chip designers who come over to gesticulate and tell them how to design instruments.

In Keyi, if they were not desperate, would they be willing to listen to Yongxing's command?

Change quartz to metal? Are you crazy?

At this level, Nakamura relied on talent, and Cheng Yongxing relied on plug-ins and cheats.

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After passing the first level, it is the second level.

This second level is also related to the equipment structure.

This is the "Two-Flow" air intake mode that has been used by later generations for 30 years.

The growth temperature of GaN materials is much higher than that of traditional semiconductors, generally above 1000 degrees.

At high temperatures, the gas on the substrate surface will spontaneously diffuse upwards, resulting in insufficient nitrogen partial pressure on the epitaxial surface, and GaN is easy to decompose.

Nakamura invented a dual-beam reaction chamber structure, that is, one way is a horizontal airflow carrying the precursors of the chemical reaction into the reaction chamber, and the other way is a vertical airflow entering the reaction chamber from top to bottom.

To put it bluntly, there are two air streams, one blowing from the side and the other blowing from the top to the bottom. This top-down airflow has played a role in suppressing the decomposition of GaN.

The emergence of this technique is entirely the result of Nakamura's head shot, without any explanation.

Nakamura didn't take any detours, but one step was the right way.

This kind of luck and coincidence has left researchers all over the world speechless!

Because there is no second developer in this way!

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Judging from the information that has been disclosed, Cheng Yongxing even highly suspects that this Nakamura is actually a traverser!

Some of his manipulative techniques, skills, and even life choices appear to be unreasonable.

As a graduate student in a prestigious school, Nakamura actually gave up his job in a big city or a big company and went to work in a township and village enterprise. Isn't it just to pursue relatively independent and complete R&D power?

In a large company, do you want to modify equipment and instruments?

Discuss first!

Does this resemble Cheng Yongxing's thinking in testing and hogging resources to do semiconductor projects?

Hero Nakamura, really entered the blue LED from April 1989.

As soon as this guy came out of the mountain, he would achieve results all the way, killing all over the world!

When he appeared on the LED battlefield, he was a full-scale tuba! Carrying the best equipment and skills all over!

Then I saw the gods killing the gods, and the Buddha blocking and killing the Buddha. Single-handedly, drove out a gold mountain and a sea of ​​silver and gold.

This story was made up, and no one dared to write it like that except for the traverse novel.

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The journey of blue LEDs is still very long, with one pass and the next.

There are big bosses in all levels, and it is still far away from the final victory.

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Bubu Jingxin series mainly refers to blue LEDs involving some technical texts. It is not released continuously. It runs through this volume from beginning to end. Rebirth of Northland Technology latest chapter address: https://www.readwn.com/book/128175.htmlRebirth of Northern Science and Technology Full Text Reading Address: https://www.readwn.com/read/128175/Rebirth of Northland Technology txt download address: https://www.readwn.com/down/128175.htmlRebirth of Northland Technology Mobile Reading: https://m.readwn.com/read/128175/For the convenience of reading next time, you can click \"Favorites\" below to record this (Chapter 212 Step by Step (1)) reading record, next time Open the bookshelf to see it! If you like "Rebirth of Northland Technology", please recommend this book to your friends (QQ, blog, WeChat, etc.), Thank you for your support! ! (www.readwn.com)