Chapter 458 The line formation is coming
Speaking of this matter, Lin Lianwei was more excited than Gao Zhendong.
This means that the circuit design of their orthogonal quaternary detector will be much simpler. Although it does not require very good consistency, better consistency is good for the seeker performance.
And they have calculated that when a crystal is cut, with a mercury cadmium telluride crystal a few millimeters thick and more than ten millimeters long, no matter what, a set of four infrared photodiodes can at least Make a set and it will be a natural match, so you don’t have to fiddle too much with the circuit to compensate for the balance.
Lu Gong also applauded. Now, one of the core things of the Thunderbolt-1 modification, the orthogonal four-element infrared detector, has been completely solved, and it has been solved extremely beautifully.
He looked at Gao Zhendong: "Mr. Gao, come and announce it. I see that the comrades over there are all impatient, haha."
Gao Zhendong shook his head: "You did this. You announced it yourself, I’m too lazy to say it, haha.”
Mercury cadmium telluride crystal is not equal to mercury cadmium telluride infrared photodiode. Gao Zhendong was too lazy to even grab the glorious moment when his comrades announced success.
Lu Gong had not dealt with Gao Zhendong once or twice. He probably knew a little bit about Gao Zhendong’s character, so he was not polite: “Okay, then I won’t be nagging.”
After speaking, he raised his head and announced loudly to the crowd at Factory 1274: "Comrades! This pipe is done! It's a success! Thank you to the comrades of Factory 1274 for your strong support!"
As soon as he finished speaking, even though he didn't reveal even half a word of the specific performance, all the comrades cheered together.
For the comrades of Factory 1274, including Fang Yinghong and others who came to support from the third rolling mill, this at least proves that the improvement of the diffusion furnace is effective and may not necessarily cover the needs of integrated circuits. , but at least for now, it can meet the process requirements of some new products.
This itself is of great significance.
The comrades in charge of testing at the Guangdong Research Institute can only applaud now. They are actually the first batch to know the performance of infrared photodiodes, but they cannot tell them in advance, so they can only watch the excellent performance of the device while He tried his best to suppress his vigorous desire to express himself until Lu Gong officially announced his success.
When everyone was almost happy, Gao Zhendong smiled and said: "Comrades, originally, today, I came to visit the comrades, solve the problem, and treat the comrades of the research group to a good meal. But now It seems that I can save money on this meal. I am afraid that the comrades from the Institute of Guidance and Research will have to pay for this meal.”
If he can't invite him for this meal, the Institute of Guidance and Research will have to come forward on its own. The fact that he is the deputy chief engineer of Thunderbolt-1 cannot be revealed, and without this identity, he cannot handle this matter himself.
Everyone burst into laughter. Mr. Gao had thought everything through, even thinking about eating.
After listening to what he said, Lu Gong laughed loudly: "Yes, yes, Mr. Gao said it well. No one can compete with us for today's meal! We have to be grateful for this time. For our new components, the comrades of the 1274 Factory and the Third Steel Rolling Plant who worked tirelessly and tried their best to cooperate.”
For him, this meal is a treat, and the cooperation of the 1274 Factory has indeed made it possible. Well, in addition to official thanks, these things are also necessary, otherwise this person will look bad.
Besides, the deputy chief engineer is here. It was him who asked the institute to treat them to a meal. He was afraid that they would not be able to pay the bills, which was equivalent to giving them a face by granting the funds to the director.
The comrades in Factory 1274 were happy to hear that there was indeed food to eat, and the comrades in the Guidance and Research Institute were enlightened.
Several comrades in the No. 3 Rolling Plant secretly laughed inwardly. They treated guests to dinner whenever there was a major issue. It was Chief Engineer Gao's old habit, but this time they found someone to pay for it.
What they didn’t know was that Gao Zhendong actually approved the money provided by Lu Gong.
While Lu Gong arranged for people to seal up the products and pack up the test equipment, he asked General Engineer Lu from Factory 1274 to help him arrange meals. This matter cannot be done by dragging a large force to his own unit. It was settled in the cafeteria of Factory 1274, and he would just be responsible for signing. He didn't even need to give cash, and the two units would settle the matter naturally.
On the way to the canteen, Lu Gong also reported to Gao Zhendong another matter of concern to him.
"Mr. Gao, last time you asked us to try to see how many basically identical infrared photodiodes can be made from one crystal. We have also done preliminary analysis and design on this matter, and the situation is not bad."
Gao Zhendong's mood perked up: "Oh? Tell me."
Lu Gong nodded and said: "If we just want the smallest infrared photodiode, we have done an analysis based on the size of the mercury cadmium telluride crystal body. According to calculations, it can be roughly 0.8 mm in length, 1.5 mm in height and still ensure performance.”
They make orthogonal quaternary detectors, which require detector structure, so the diode has shape and size requirements. , and Gao Zhendong just wants to ensure the smallest infrared photodiode under the premise of performance, so he can consider it as small as possible.
And this size is the limit they analyzed. No matter how small it is, there will be some problems whether it is physical processing technology or electronic component processing technology.
Gao Zhendong listened, nodded, and began to calculate rapidly in his mind.
According to the current capabilities, it is basically guaranteed to produce a crystal with a volume of about 150 cubic millimeters. Calculated purely from the volume, plus cutting consumption, the mercury cadmium telluride crystal required for each photodiode is calculated according to Considering 1*1*1.8, roughly 80 diodes can be processed. Taking into account factors such as corners, processing losses, and yield rates, this quantity was discounted by 30%. Gao Zhendong was delighted to find that he could process a 1*56 linear array with a mercury cadmium telluride crystal!
Of course, this is only a theoretical calculation. The specific calculation may not be so optimistic, but at least the theory must be clear before considering anything else.
This result made him very happy and gave Lu Gong a task.
"Mr. Lu, I will give you a few large crystals later. You make a request based on your theoretical calculations and hand them over to Factory 1274 to make several sets of infrared photodiodes. In terms of funding, ask me directly. I will give it privately first. "
This year, Gao Zhendong has been writing a steady stream of books, and he has also received royalties for the printing of some old books. It is still affordable to buy a few sets, especially if you only need Considering the material cost and processing fee, it's actually not that expensive, at least it's not a big deal to him.
Although he was surprised by Gao Zhendong's behavior of paying out of his own pocket, Lu Gong knew that many things should not be asked casually, especially about Gao Zhendong.
He must have his own reasons for doing this.
Lu Gong readily agreed to this matter.
Gao Zhendong turned around and discussed with Mr. Lu the progress of other processes besides the diffusion furnace.
Mr. Lu smiled and said: "Overall, it's okay. We are already familiar with the packaging part, and your request is not too exaggerated. We are making improvements based on the existing equipment. The problem Not big. It’s not finished yet, but the progress is within our plan.”
“What about the resistance heating vacuum evaporation machine?”
“That one is easier to handle. The main requirement is to evaporate aluminum. The melting point of this thing is not high, so it is not too difficult to do. To put it bluntly, it is to boil water, but the method we use is more straightforward. , just use tungsten wire to heat it. If the temperature is not enough, increase the current. "
The melting point of tungsten is far beyond the boiling point of aluminum at normal pressure, so there is no problem in doing this.
Great efforts can produce miracles. Gao Zhendong had already expected this. The aluminum wire evaporation of early integrated circuits did not have high requirements for the control of thickness, smoothness, density, etc. It was plating if it was not possible. A thicker kind of thinking.
It’s so cool to get involved in the early stages of technology development.
"Is it done?" Gao Zhendong was still quite happy.
“Not yet. Now that the diffusion furnace is basically completed, we can turn around and do that. Although these two things have completely different uses, there is still quite a overlap in expertise in terms of control methods and specific research. High. Several comrades in your factory have been pressed for renovation of the diffusion furnace some time ago.”
For the 1274 factory, Fang Yinghong and other comrades with rich automatic control experience have been very helpful. After all, they worked under Gao Zhendong, and their knowledge and experience in self-control are still "slightly" higher than those of the comrades in Factory 1274.
Therefore, when the transformation of the diffusion furnace affects several of them, after the resistance heating vacuum evaporation machine creates a prototype, the remaining actual debugging work will be affected.
Gao Zhendong is not in a hurry. He still doesn’t know what is going on with the optical system of the lithography machine.
When we arrived at the cafeteria, Director Lu from 1274 was already waiting here. Director Tang had already sent someone to report to him about Gao Zhendong’s arrival. He was just busy with work, so it was impossible to go directly to the craft workshop. If you are looking for it, then there is no need.
But you must show up to eat. Seeing Gao Zhendong, Director Lu greeted Gao Zhendong very warmly.
If you are not enthusiastic, you will feel sorry for yourself.
Even if the process modifications provided by Gao Zhendong are not used in integrated circuits, the improvement in yield rate for the production of their existing products is not even a little bit.
They are already planning to use the results of the transformation of the diffusion furnace to extend it to all diffusion furnaces in the factory. In this regard, their participation in the transformation of the integrated circuit process was not in vain.
Now that Gao Zhendong has come in person, he is very reasonable. As long as he is in the factory, he will come forward no matter what.
Under the warm greetings of comrades from the 1274 Factory and the Research Institute, Gao Zhendong arrived home by car after 9 o'clock. Just in time, he and Xie Jianye brought the car back. The car went back to the factory first, and then they went back to the factory. Riding a bicycle back on my own means that I feel like I have eaten enough to hold on.
When Lou Xiaoe saw Gao Zhendong coming back and drinking again, she quickly brought him tea. She and Chen Yuehong had dinner together, which was just right.
(End of this chapter)