Chapter 426: Mercury cadmium telluride can be used
"CVD? Chemical vapor deposition?" Although he has never done it, Yu Yuncheng has some impressions.
Gao Zhendong nodded. In addition to CVD, there are also technologies such as LPE (liquid phase epitaxy) and MBE (molecular beam epitaxy) for thin film crystal manufacturing. However, they are a little advanced and cannot be done in this environment, especially It's an MBE, which is a bit too much in the current environment.
CVD is a very versatile technology, not only used in semiconductors.
Factory 1274 has limited power. If we continue to engage in CVD, we may not be able to do it.
Yu Yuncheng is more suitable here. He is engaged in this. He has a theoretical foundation and practical research experience in crystal growth and forming. It is much more suitable than Factory 1274.
However, in this regard, Gao Zhendong has nothing to help him for the time being. Let's see if he can find a way out on his own. It seems a waste to search for information specifically for this matter. Even Gao Zhendong can't remember that he has There is no CVD related material anymore, there were too many things to package and download in the past.
After listening to Gao Zhendong’s words, Yu Yuncheng thought about it carefully and felt that this is really a path worth studying. There have been some theoretical results and practical realizations, but overall the path has not been completed. the point.
Probably we are all at the same starting line. If we can really get it done, it will still be a great sense of accomplishment.
"Well, Chief Engineer Gao, I have written down your idea. I will go back and check the information carefully before making a decision." Anyway, the mercury cadmium telluride crystal still needs some time to grow, so he is not in a hurry. Open a new pit now.
First do some research and make preparations. The suggestions put forward by General Manager Gao can be used as key areas of focus.
I invited Yu Yuncheng to have a meal at noon, and Yu Yuncheng ran away in the afternoon. Haihekou is not far from the capital, which is quite convenient. Moreover, this time I asked comrades from the army to escort mercury cadmium telluride crystals. car.
After Yu Yuncheng left, Gao Zhendong looked at a tightly packed box in front of him with a happy face.
It was said that they were being escorted, but in fact there were not many things. The escorted cars were mainly for carrying people, not things.
Gao Zhendong picked up the phone and called Lu Gong from the Institute of Guidance and Research. He was in charge of the infrared air-to-air guidance system and was now the person in charge of the guidance system modified by Thunderbolt-1 that Gao Zhendong suggested.
Lu Gong answered the phone and after listening to Gao Zhendong's words, he took Lin Lianwei and the others to the third rolling mill without saying a word. Chief Engineer Gao had already made new infrared sensitive materials!
Don’t forget, Gao Zhendong is still the deputy chief engineer of Thunderbolt-1.
In less than an hour, they were sitting in Gao Zhendong's office. Gao Zhendong showed them a test result of the mercury cadmium telluride material.
For this batch of materials, Gao Zhendong asked Yu Yuncheng to make them in the 8-14 micron band, which is more suitable for them to use as infrared seekers.
Gong Lu took the test results and laughed while looking at them, grinning from ear to ear with joy.
"Intrinsic excitation, high quantum efficiency, high absorption coefficient, good, good!"
"Higher operating temperature, wide operating range, low dielectric constant, interesting."
"Also Can the infrared band be adjusted? This is more interesting, but now the 8-14 micron is suitable for us."
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After reading the inspection results, Lu Gong looked up at Gao. Zhendong: "Commander Gao, do you think this material has been finished?"
Gao Zhendong nodded: "Yes, we have it. Although the output is not high and the price is expensive, mass production is no problem. You can take a look here."
After saying that, Gao Zhendong took out a mercury telluride The cadmium crystal was handed to Lu Gong.
Lu Gong admired and looked at the crystal. The appearance of the cadmium mercury telluride crystal and the silicon crystal were completely different, more like a piece of metal.
Looking at this small crystal, Lu Gong was mentally calculating the size.
"Gong Lu, the consistency of this crystal is very good, so you can consider cutting it with one crystal to ensure that the materials for the four infrared phototubes of each orthogonal quaternary detector come from the same crystal. Crystal.”
These crystals are several millimeters thick and about 10 millimeters long, which can already meet Gao Zhendong's suggestion.
Although the infrared seeker looks more than 100 millimeters thick, in fact, the orthogonal four-element detector puts aside the optical part. The real infrared detector body is not that thick, just a small piece in the middle of the seeker. .
Gong Lu smiled and said: "Well, Chief Engineer Gao, your suggestion is good. Can the current production technology ensure that every crystal reaches this specification?"
Gao Zhendong nodded, He took out more than a dozen tightly packed mercury cadmium telluride crystals from the safe: "Yes, as long as it is a qualified finished product, it must be at least this specification. This is the minimum requirement for the mass production process."
In fact, Yu Yun The total amount that Cheng brought over was more than that, but it was not just the Institute of Guidance and Research who needed to use this thing. For the Institute of Guidance and Research, this amount should be enough now.
Sure enough, Lu Gong was overjoyed to see Gao Zhendong bring out such a pile at once. He originally thought he could get a few and just start the research first. After all, this thing had just been completed.
But I didn’t expect there to be more than ten. In this way, more things can be done at the same time, and you don’t need to be so cautious when using them.
Long Gong was afraid that Gao Zhendong would take it back again, so he quickly signaled to his men to put the things away, and said with a smile: "Commander Gao, I won't be polite, haha."
Strict It seems that Gao Zhendong just showed these crystals to him and didn't say that he would give them to him yet, so he gave full play to his subjective initiative, took action directly, and settled down. The person in charge is Lin Lianwei. Look, every time you come to General Engineer Gao's place, it's always a good idea to take him with you.
Gao Zhendong saw the actions of these two people and was a little bit dumbfounded.
“Wait a minute!”
Hearing Gao Zhendong’s words, Lin Lianwei’s hands froze, feeling uncomfortable.
"You guys will count the numbers first, go through the formalities, and then take them away. What's the rush? Hahaha."
Engineer Lu breathed a sigh of relief. This Chief Engineer Gao is pretty cool. Can joke.
After Gao Zhendong made a little joke with them, he got down to business: "Mr. Lu, when you are making infrared photodiodes, do me a favor."
"Okay, you say it." Lu Gong didn't ask what he was busy with. Mr. Gao said, regardless of whether he can do it or not, he will accept it first. The main reason is that he has given too much for so long, not to mention that he still has a Thunderbolt-1 modification. The title of deputy chief engineer.
"Do some research on how many infrared photodiodes can be produced from a single mercury cadmium telluride crystal while ensuring yield and performance."
Line Scan Heat Imaging line arrays have requirements for consistency. Before thin film crystal growth technology was developed, the simplest way to solve the consistency problem was to use the same crystal.
Originally, the solid-state recrystallization method was used. In addition to the simplicity of the process, this method was chosen because of its good crystal consistency.
It's just that Gao Zhendong doesn't know how many diodes can be made from one crystal. If the quantity is not enough, then there will only be a selection process.
This matter can only be determined by letting the Research Institute do some research first.
Lu Gong agreed immediately, this is their specialty.
Before leaving, Gao Zhendong thought of something again.
“If you have any questions about the manufacturing process of mercury cadmium telluride infrared photodiodes, you may consider contacting Factory 1274. They are engaged in semiconductor manufacturing processes and have some new equipment and processes that were not available before. Maybe I can help you. I will say hello to them and cooperate with you when necessary.”
To make mercury cadmium telluride into a photodiode, it does not require the steps of photolithography, but the necessary passivation, substrate, ion implantation or diffusion are still needed. This is a new material, and it may be different from previous processes. , so Gao Zhendong reminded them about Factory 1274.
When Lu Gong heard this, he saw that Deputy Chief Gao’s arrangement was really thoughtful. He even took the process into consideration, and he happily wrote down the things about Factory 1274.
Gao Zhendong grabbed Lin Lianwei and made an appointment with him for dinner on Saturday. He was going to see his wife on Sunday, so Saturday was okay.
If you want to help an old classmate, you don’t have to do too much. Don’t talk too much about the internal work arrangements of his company unless necessary. Just make an appointment with him for dinner in front of other people. That’s it.
After work, Gao Zhendong ran to the cafeteria to have dinner.
Lou Xiao'e is at school, so there is no point in going home to eat by herself. Gao Zhendong has temporarily returned to the life of a bachelor.
Silly Zhu saw Gao Zhendong and laughed at him: "Oh, Zhendong, my wife is not at home, are you completely free? You ate in the cafeteria."
The kitchen behind the cafeteria , Liu Lan looked at Silly Zhu outside and curled his lips: "Master He has such a mouth, he will suffer sooner or later. Chief Engineer Gao of the No. 3 Factory is the only one named."
Another canteen master smiled and said: "You don't have to worry about him. He lives in the same house as General Engineer Gao, and they have a very good relationship. Didn't you see that every time General Engineer Gao treats a guest, who does he ask to take the spoon? That's what people are used to, and General Engineer Gao doesn't care. Don't care, what are you in a hurry for?"
Whoever cooks the dinner is a good job, which means he can get the food on the table. This is an unspoken rule, and everyone knows it.
Speaking of this, Ma Hua, Shazhu's new apprentice, laughed quietly. Chief Engineer Gao was treating the guests, and the master was serving the dishes, so he got a lot of them.
Outside, Gao Zhendong said with a smile: "Isn't there nothing you can do about it when you go to work? If you were off work today, I would go to your house to have a meal."
Ma Hua looked at Liu Lan glances at it, look at it, look at it.
——
If you want to talk about this, it is really a series of things. Just after the mercury cadmium telluride incident was over, comrades from the Institute of Communications came over again.
They came here with the basic knowledge of switches given by Gao Zhendong. After learning thoroughly, they sorted out relevant ideas.
Speaking of which, Yuanyan obtained the laser gyroscope materials earlier than them, but they haven’t digested them yet.
As usual, the leader of the team is Chief Engineer Feng. This matter is the top priority of their Communications Institute recently.
"Mr. Gao, although the traffic data has not yet been completely returned, we now have preliminary ideas and want to develop large, medium and small-scale program-controlled air division switches."
It is worthy of being a major scientific research institute directly under the ministry and commission, and it has established a big one right away.
(End of this chapter)