Volume 1: Student Life Chapter 241 MPCVD
Chen Zhou glanced at Dr. Wu who was smiling at him, but did not rush to answer the question.
He didn't think that Dr. Wu would ask him, a mathematics student, questions about semiconductor material research for no reason.
Chen Zhou's mind was constantly filtering and selecting information related to this topic.
"The key to this project is the preparation and doping of single crystal diamond, and the main problem we helped to solve should be the problem in the doping process."
Hearing Chen Zhou's words, Dr. Wu's eyes lit up. This young man is quite interesting and has a strong ability to grasp the key points.
"That's right." Dr. Wu nodded. "You two should mainly use mathematical methods to help analyze and solve the problems of p-type doping, n-type doping and co-doping."
When Shen Jing heard the conversation between the two, he looked at Chen Zhou in surprise. Why are we reading different documents?
What are these mixed things?
Just when Shen Jing was confused, Peng Fei had already come over with Pan Shiyan.
"Dr. Wu, Shiyan is here."
Pan Shiyan first glanced at Chen Zhou and the other man, focusing on Chen Zhou for two seconds before she said to Dr. Wu, "Teacher, I'll take them to get familiar with the place first."
Dr. Wu nodded and said, "Okay, I'll go check out the other research group first. Shiyan, you take them to get familiar with the environment, and Pengfei, you go prepare for the afternoon experiment."
"Okay, Dr. Wu (Teacher)." Several people responded at the same time.
After explaining everything, Wu Xinyue left the laboratory.
She is in charge of two projects at the same time, one of which is about new bulk material rare-earth magnetic semiconductors.
"Shiyan, I'll go and get busy first. I'll leave Chen Zhou and the others to you." After Peng Fei finished speaking, he smiled at Chen Zhou and the others, then went to do his own thing.
He originally thought that Wu Xinyue would hand the two of them over to him, but he didn't expect that she would call Pan Shiyan over.
But it's not surprising. Pan Shiyan is Wu Xinyue's favorite disciple, and it is obviously more appropriate for her to lead Chen Zhou and the other two.
Pan Shiyan looked at Chen Zhou and the other man and introduced herself: "I am your senior from the Department of Chemistry at Yan University."
"Chen Zhou, from the Department of Mathematics at Yanda University, hello senior!" said Chen Zhou.
"Hello, senior, my name is Shen Jing, and I'm also from the Department of Mathematics at Yanda University." Shen Jing also said.
Pan Shiyan nodded and looked at Chen Zhou: "Chen Zhou, I know you, the new generation of genius mathematician of Yan University, who proved the hailstone conjecture."
Chen Zhou smiled and said, "Thank you for the compliment, Senior."
Pan Shiyan didn't comment, and said, "Let's go, I'll show you around."
Hearing this, Chen Zhou and Shen Jing followed.
Pan Shiyan didn't say much. Along the way, she just briefly introduced the various instruments and equipment, as well as the experimental content of this project.
Other than that, he didn't say a word.
Chen Zhou and Shen Jing looked at each other and both felt that this senior schoolmate was quite aloof.
Chen Zhou and Shen Jing followed silently behind, not daring to say much.
After walking for a while, Pan Shiyan finally asked when they arrived at the experimental area for single crystal diamond preparation: "The technological innovation speed 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 being used in electronic devices. Do you know why we use diamond in this project?"
Chen Zhou and Shen Jing looked at each other again. Shen Jing gave Chen Zhou a look and said, "I'll leave it to you. I don't understand these things..."
Chen Zhou was just puzzled. Why did both the master and the disciple like to ask people questions?
Why aren't you asking such simple questions? If you are going to ask, why don't you ask something more difficult?
Thinking this way, Chen Zhou would definitely not say it out loud. What if this arrogant 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 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, high temperature and high pressure."
"Diamond can exhibit n-type and p-type conductivity through doping, and its performance will far exceed that of materials such as gallium arsenide, gallium nitride and silicon carbide. It is currently the most promising wide-bandgap high-temperature semiconductor material."
Pan Shiyan looked at Chen Zhou with a little surprise. She didn't expect that this man knew so much.
"That's right. But there's more to it," Pan Shiyan added. "Diamond has a wide band gap, so it can be used as an active device material, such as field-effect transistors and power switches, and a passive device material, such as Schottky diodes, in the semiconductor field."
After a pause, she looked at Chen Zhou and asked, "You just said that diamond is a wide-bandgap high-temperature semiconductor material. How did you know that?"
Chen Zhou glanced at Pan Shiyan and thought for a while. Since you have opened the topic, I will not be polite.
Chen Zhou said: "The band gap width of diamond is 5.5eV, its high carrier mobility is 4500cm2 /(V·s), hole mobility is 3800cm2/(V·s), high thermal conductivity is 22W/(cm·K), and high breakdown electric field is 10MV/cm."
"The electron carrier saturation velocity is between 1.5 × 10^7 and 2.7 × 10^7 cm/s, the hole carrier saturation velocity 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 preparation of next-generation high-power, high-frequency, high-temperature and low-power loss electronic devices."
After saying this, Chen Zhou paused for a moment and continued, "Although the reserves of diamonds are very scarce, people have already synthesized artificial diamonds from graphite in the 1950s."
"Moreover, artificial diamonds and natural diamonds have the same structure and similar properties, which solves the problem of the source of diamonds very well."
"In addition, in the 1980s, the hot-filament chemical vapor deposition device, or HFCVD, was established to produce diamond films on non-diamond substrates. By the mid-1990s, the theory of diamond film deposition had been relatively complete."
"Although the research on diamond films was not very successful due to the constraints of preparation methods in the late 20th century and early 21st century, the emergence of repeated growth methods, three-dimensional growth methods and mosaic methods has promoted the development of large-size diamond preparation."
As Chen Zhou continued to narrate, Shen Jing beside him was already stunned.
Hey man, are you really our mathematics major?
No, are you really our physics and mathematics major?
Why are these chemical methods so familiar?
Of course, what surprised Shen Jing even more was why he had never seen these contents in any literature?
Whether it was the research materials sent by the 43rd Institute or the research materials sent to him by Chen Zhou, there was none...
In addition to Shen Jing, the researchers who were originally doing the experiment also looked back at Chen Zhou in surprise.
Didn’t you say you were looking for someone from Yanda’s Department of Mathematics to help you?
Why do I think this looks like the Chemistry Department?
Pan Shiyan, who asked the question, was also surprised by Chen Zhou's fluent narration.
She originally wanted to teach two new students, but she didn't expect to be taught the same lesson again by Chen Zhou.
Chen Zhou glanced at everyone, slowly lowered his gaze to the experimental device, and said softly: "The method you used to prepare diamond film should be a microwave plasma chemical vapor deposition device, that is, MPCVD method."
