Chen Zhou glanced at Dr. Wu, who was looking at him with a smile, but he was not in a hurry to answer the question.

He didn't think that Dr. Wu would ask himself a question about semiconductor materials research as a mathematics major for no reason.

Chen Zhou's mind was constantly filtering and sifting through the information related to this topic.

"The key to this project is mainly the preparation and doping of single crystal diamond, and the problem that the two of us mainly help to solve should be the problem in the doping process. ”

Hearing Chen Zhou's words, Dr. Wu's eyes lit up, and the young man was a little interesting, and he had a strong ability to grasp the key.

"That's right. Dr. Wu nodded, "The two of you mainly use mathematical methods to help analyze and solve the problems of p-type doping, n-type doping and co-doping. ”

Shen Jing heard the conversation between the two people and looked at Chen Zhou in surprise, why are the two of us reading different literature?

What are these doped things, what are they mixed with?

Just when Shen Jing was puzzled, Peng Fei had already walked over with Pan Shiyan.

"Dr. Wu, Shiyan is here. ”

Pan Shiyan first glanced at Chen Zhou and the others, and focused on Chen Zhou for two seconds before saying to Dr. Wu: "Teacher, then I'll take them to get acquainted with it first." ”

Dr. Wu nodded: "Okay, I'll go to another research group first, Shiyan, you take them to familiarize themselves with the environment, and Peng Fei, you go to prepare for the afternoon experiment." ”

"Okay, Dr. Wu (teacher). Several people answered at the same time.

After explaining the matter, Wu Xinyue left the laboratory.

She is responsible for two projects at the same time, and one is about a new type of bulk dilute magnetic semiconductor.

"Shiyan, then I'll go and get busy first, Chen Zhou, and they will be handed over to you. After Peng Fei finished speaking, he smiled at Chen Zhou and the two of them, and went to work on himself.

Originally, he thought that Wu Xinyue would hand over the two to him, but he didn't expect to call Pan Shiyan over.

However, it is not surprising that Pan Shiyan is Wu Xinyue's proud disciple, and it is obviously more suitable for her to take Chen Zhou and the two of them.

Pan Shiyan looked at Chen Zhou and the two of them, and introduced herself: "I am your senior sister, from the Department of Physics of Yan University. ”

"Chen Zhou, from the Department of Mathematics of Yan University, hello senior sister!" Chen Zhou said.

"Hello senior sister, my name is Shen Jing, and I am also from the Department of Mathematics of Yan University. Shen Jing also said.

Pan Shiyan nodded and looked at Chen Zhou: "Chen Zhou, I know you, a new generation of genius mathematicians at Yan University, have proved the hail conjecture. ”

Chen Zhou smiled: "Senior sister has won the award." ”

Pan Shiyan was noncommittal, and instead said, "Let's go, take you to see." ”

Hearing this, Chen Zhou and Shen Jing followed.

Pan Shiyan didn't say much, and just briefly introduced various instruments and equipment along the way, as well as the experimental content of this topic.

Other than that, I didn't say a word.

Chen Zhou and Shen Jing glanced at each other, and they both felt that this senior sister was quite cold.

And Chen Zhou and Shen Jing followed silently behind, not daring to speak more.

After walking for a while, it was not until she came to the experimental area for the preparation of single crystal diamond that Pan Shiyan asked out loud: "The speed of technological innovation of semiconductor materials and devices has always followed Moore's law and contributed to the development of the information industry. ”

"With the continuous development of the semiconductor industry, more and more semiconductor materials are used in electronic devices. Do you know why we use diamond for this project?"

Chen Zhou and Shen Jing glanced at each other again, and Shen Jing gave Chen Zhou a look, I'll give it to you, I don't understand this......

And Chen Zhou only wondered, why did the master and apprentice like to ask people questions?

It's just that it's all such a simple question, and it's difficult to ask something?

Thinking like this, Chen Zhou would definitely not say it, in case this cold senior sister ......

Retracting his thoughts, Chen Zhou said softly: "Ordinary semiconductor materials are constrained by their own properties, and their application under high temperature conditions will be greatly limited. ”

"Diamond semiconductor devices, on the other hand, have excellent electrical properties such as high carrier mobility, high thermal conductivity, and low dielectric constant, and can operate in very harsh environments such as high frequency, high power, and high temperature and high pressure. ”

"Diamond can exhibit n-type conductivity and p-type conductivity through doping, and its performance will far exceed that of materials such as gallium arsenide, gallium nitride and silicon carbide, and it is currently the most promising wide bandgap high-temperature semiconductor material. ”

Pan Shiyan glanced at Chen Zhou with a little surprise, but she didn't expect this person to know a lot.

"That's right. But that's not all," Pan adds, "because of the wide bandgap of diamond, it can be used in the semiconductor field as a material for active devices, such as MOSFETs and power switches, as well as for passive devices such as Schottky diodes." ”

After a pause, she looked at Chen Zhou and asked, "You just said that diamond is a wide bandgap high-temperature semiconductor material, how do you see it?"

Chen Zhou glanced at Pan Shiyan and thought about it, since you have opened the topic, then I am welcome.

Chen Zhou said: "The band gap width of diamond is 5.5eV, and its high carrier mobility is 4500cm?? /(V·s), the cavity is 3800cm?? /(V·s), high thermal conductivity at 22W/(cm·K), high breakdown electric field at 10MV/cm. ”

The electron carrier saturation rate is between 1.5×10^7 and 2.7×10^7 cm/s, the hole carrier saturation rate is between 0.85×10^7 and 1.2×10^7 cm/s, and the low dielectric constant is 5.7. ”

"Based on these excellent performance parameters, diamond is considered to be the most promising material for the next generation of high-power, high-frequency, high-temperature, and low-work loss electronic devices. ”

After saying this, Chen Zhou paused and continued: "Although the reserves of diamond are very scarce, people have used graphite to synthesize synthetic diamond in the 50s of the last century. ”

"Moreover, synthetic diamond and natural diamond have the same structure and similar properties, which also solves the problem of diamond source. ”

"In addition, in the 80s of the last century, it was already possible to prepare diamond films on non-diamond substrates by establishing a hot filament chemical vapor deposition device, also known as the HFCVD method. By the mid-90s, the theory of diamond film deposition had been relatively well established. ”

"Although the research on diamond film was not smooth due to the constraints of preparation methods at the end of the 20th century and the beginning of the 21st century, the development of large-size diamond preparation was promoted with the emergence of repeated growth method, three-dimensional growth method and mosaic method. ”

With the voice of Chen Zhou's narration, Shen Jing beside him was already dumbfounded.

Hey guys, are you really our math major?

No, are you really our physics and math major?

How is this chemistry so familiar?

Of course, what surprised Shen Jing even more was that why didn't he see these contents in the literature?

Whether it is the subject materials sent by the 43rd Institute or the subject materials sent to him by Chen Zhou, there is no ......

In addition to Shen Jing, the researchers who were originally doing experiments also looked back at Chen Zhou with a surprised expression.

Didn't you say that you were looking for someone from the Department of Mathematics at Yan University to help?

How do I see this as a chemistry department?

And Pan Shiyan, who asked the question, was also surprised by Chen Zhou's fluent narration.

She originally wanted to give a lesson to two newcomers, but she didn't expect to be re-taught by Chen Zhou.

Chen Zhou glanced at everyone, slowly fell his gaze on the experimental device, and said softly: "The method you use to prepare diamond thin films should be the microwave plasma chemical vapor deposition device, that is, the MPCVD method. ”