Shen Jing turned his head again and whispered to Dr. Wu.

Chen Zhou shifted his attention to the experimental device.

Just now, Dr. Wu's words reminded him.

In diamond doping experiments, the carrier concentration affects Hall mobility.

The Hall mobility directly reflects the degree of boron doping in the diamond.

In addition, boron doping is achieved by adding a boron source to the reaction chamber used to prepare diamond films by the MPCVD method.

Boron-containing gases such as B2H6 and B(CH3)3 are generally used as boron sources.

When the concentration of boron doping is high, the prepared diamond doping contains many point defects, line defects and surface defects.

These defects trap the carriers and affect the Hall mobility of the diamond material, which in turn affects the prepared boron-doped diamond.

"Sure enough, whether it is the preparation of the diamond film itself or the preparation of single crystal diamond under doping experiments, it is a contradictory experimental ......," Chen Zhou thought to himself.

After thinking about it, Chen Zhou said to Dr. Wu and went to the n-type doping experiment.

As Dr. Wu said, n-type doping is much more difficult than p-type doping.

For p-type doping, you can also refer to this natural sample.

However, n-type doping can only be explored.

Speaking of which, n-type doped phosphorus elements are explored step by step from nitrogen, sulfur, and lithium.

The radius of the covalent bond of phosphorus is 1.4 times that of carbon, and the energy level is 0.58 MeV below the bottom of the conduction band.

Because of these properties, phosphorus can form shallow energy levels in diamond films, making it an ideal element for n-type doping of diamonds.

However, the carrier mobility of n-type phosphorus-doped diamonds is still much lower than that of p-type boron-doped.

Chen Zhou found Peng Fei and asked softly, "How is the experiment going?"

Peng Fei pointed to the experimental device in progress: "It's okay, it's not much different from the previous times." ”

After a pause, he looked at Chen Zhou and said with a smile: "It depends on the results of your data processing." ”

Hearing this, Chen Zhou smiled: "We will do our best." ”

Peng Fei said again: "If there is anything you need help with, just say it." ”

Chen Zhou nodded: "Don't worry, I won't be polite." ”

After speaking, the two looked at each other and smiled.

Compared with others, Peng Fei, who was arranged to pick them up at the high-speed rail station at the beginning, made Chen Zhou feel much more comfortable.

After thinking about it, Chen Zhou asked, "What is the doping concentration of phosphorus in diamond now?"

Peng Fei didn't answer directly, but said: "Because the doping concentration of phosphorus directly affects the carrier mobility, when the carrier concentration is low, the scattering effect of ionized impurities is less and the mobility is higher. ”

In 2012, Dr. P et al. increased the carrier mobility at room temperature to 780 cm by reducing the doping concentration of phosphorus in (100) crystal plane diamonds. /（V·s）。 ”

"So, on top of them, we have further reduced the doping concentration of phosphorus. The doping concentrations of phosphorus in these 10 groups were selected sequentially in the range of 4×10^15/cm~2×10^15/cm. ”

Chen Zhou nodded, and the 10 groups of experiments were controlled against each other.

Chen Zhou remembered one more thing, so he asked, "Tomorrow's co-doping experiment is also carried out by you, right?"

Peng Fei replied: "That's right. The co-doping experiment is actually n-type doping. However, it is still difficult to use a single element to achieve n-type doping of diamond, whether it is the MPCVD method we use to dop during the growth process, or the ion implantation method. ”

"But by incorporating two or more elements into the diamond, it is much easier to achieve the n-type conductivity of the diamond. ”

After a pause, Peng Fei continued: "In single-element n-type doping, neither nitrogen nor sulfur are suitable options. However, in the co-doping, the co-doping of boron and nitrogen, the co-doping of boron and sulfur, and the co-doping of phosphorus and nitrogen can all achieve the conductivity of diamond. ”

After listening to Peng Fei's words, Chen Zhou turned to ask: "This topic is mainly the research on the preparation of diamond and diamond semiconductor materials, but what about the study of properties?"

Peng Fei pointed to Dr. Wu in the distance and said, "Another research group of Dr. Wu is responsible for studying the properties and applications of diamond semiconductor materials. ”

After speaking, Peng Fei glanced at Chen Zhou and laughed softly: "What's the matter?"

"Some interest. Chen Zhou didn't deny it, but instead told Peng Fei about the particle accelerator experimental diode.

After hearing this, Peng Fei looked at Chen Zhou in surprise: "I didn't expect you to already participate in such a physics project?"

Chen Zhou replied: "This is the subject of Dean Yang of the Institute of Physics, and I am responsible for the data processing part. ”

Although Chen Zhou said it simply, Peng Fei heard a different meaning.

The research of nuclear physics can be attributed to high-energy physics, and in China, it is basically a project of the State Key Laboratory.

Chen Zhou has now participated in such a project, and I have to say that it is very powerful.

Peng Fei thought for a moment before saying, "If you are interested, you can talk to Dr. Wu, and after this topic is solved, you can add the next topic." Moreover, the 38th Institute of Huake Group is currently conducting research on dilute magnetic semiconductors, and this thing is also widely used in nuclear physics. ”

Chen Zhou said softly: "Forget it, I haven't prepared the academic report to the United States next month." ”

Peng Fei smiled: "Yes, I almost forgot that you are engaged in mathematics." Speaking of which, this is an international academic exchange conference, envy Oh......"

Chen Zhou also smiled, and the two didn't say anything more, focusing on the experimental device.

The time required for the two sets of experiments is not short, one morning, and it can only be said that the experiment is only halfway through.

Chen Zhou and Shen Jing, who had been in the laboratory all morning, discussed it at lunchtime.

Half a day in the morning has enabled the two to fully understand the mechanism of the experiment.

Especially Shen Jing, through the communication with Dr. Wu, his understanding of this experiment is no less than that of Chen Zhou.

For now, of course.

In two days, whether this guy will forget or not, only he knows.

And in the afternoon, if the two of them stay in the laboratory for another half a day, it doesn't make much sense.

Therefore, Chen Zhou and Shen Jing discussed, first asked Dr. Wu to get the experimental data, and started the specific data analysis work.

What the two didn't expect was that when they finished eating, Peng Fei took them to Dr. Wu's office.

Dr. Wu was operating on the computer, and when she saw a few people coming in, she said directly: "I guess you are bored in the laboratory, I have sorted out the experimental data just now, and you can analyze the data in the afternoon." ”

"There are also some of my initial processing of the data, which you can refer to. ”

Chen Zhou and Shen Jing glanced at each other, this Dr. Wu also understands too well, right?

But then Chen Zhou thought of something, and couldn't help muttering in his heart: "Could it be that Dr. Wu processed the data......?"

Dr. Wu added, "However, because the subject is confidential, you can only use the computer in the office to work, and you cannot bring it back to the hotel. ”

Chen Zhou and Shen Jing nodded at the same time, indicating their understanding.

After all, it is a subject of Huake Group, and if it is not secret, it will make the two of them even more strange.

A small office with two computers.

It just so happened that Chen Zhou and Shen Jing were one person.

The afternoon time of the two of them is here.

Shen Jing turned on the computer, clicked on the data casually, and asked while looking at it: "Chen Zhou, let's conduct data analysis first?"

Chen Zhou thought for a while and nodded: "Let's conduct data analysis first, and go back in the evening to continue to study the preparation process, the two are also related." ”

Shen Jing looked at Chen Zhou, good guy, you really have energy......

As if knowing Shen Jing's thoughts, Chen Zhou looked at the senior and said with a smile: "It's already started, so there's no need to delay." Now that the experimental data is available, let's grasp it with both hands. ”

After a pause, Chen Zhou added: "Grasp it with both hands, both hands must be hard!"