Xueba starts with change

Chapter 256

After Zhang Yifan left, Chen Zhou went to the bathroom to take a shower.

He didn't intend to go to sleep, but he just sorted out all the contents of the preparation process later, so that he could fall asleep conveniently.

For the information sent by Zhang Yifan and Shen Jing, Chen Zhou will sort out it again.

On the one hand, take the essence of the essence.

On the one hand, verify your own research ideas.

Originally, Chen Zhou planned to start with a comprehensive understanding of all the preparation processes of the diamond film.

Take the advantages of various processes and try to combine the optimized ones.

However, this method is too difficult.

In a short period of time, it is impossible for him to do it.

Take one of his ideas from the very beginning, that is to combine the quality of diamond film prepared by MPCVD with the speed of DAPCVD.

It seems beautiful, but there are infinitely many problems.

If it is not limited to time, Chen Zhou is willing to do more research.

But now, he intends to put this line of thought aside.

Simply start from the improvement of MPCVD method.

If you have the opportunity in the future, try the organic combination of the two.

After taking a shower, Chen Zhou looked at the time, it was not yet three o'clock.

He thought about it and set an alarm clock for 03:30.

More than half an hour is almost enough for him to sort out the complete information.

What he needs now is the reference and evidence of the data.

Although the equipment, devices, preparation parameters and other conditions of each laboratory are different.

However, these are not problems in the face of the powerful trial and error tool of the wrong question set.

On the contrary, it is very informative.

When the alarm clock rang, Chen Zhou just stopped writing.

He smiled slightly, as expected, the timing was just right.

After saving the data on the computer and tidying up the draft paper, Chen Zhou climbed into bed and went to sleep.

The next day, at 7:[-] in the morning, Chen Zhou got up.

Although he only slept for four hours, Chen Zhou's mental state was extremely good.

Turning over and getting out of bed, Chen Zhou went to the hotel restaurant for breakfast after a brief wash.

He went back to his room and put a do not disturb sign on the door.

Today, he will devote himself to the research of improving the preparation process.

However, as soon as Chen Zhou turned on the computer, he heard a knock on the door.

Frowning slightly, Chen Zhou got up and opened the door.

Standing outside the door was Zhang Yifan.

Seeing Zhang Yifan, Chen Zhou immediately understood, and he asked with a smile, "Why don't you sleep more?"

"Can't sleep..." Zhang Yifan hesitated slightly, and finally said, "I also participated in the teacher's project once, but I was far less nervous than you. How should I put it, it was very fulfilling and exciting..."

Chen Zhou jokingly said, "You mean to be nervous and exciting?"

Zhang Yifan: "Uh...almost..."

Chen Zhou glanced at Zhang Yifan: "Are you sure you don't want to take a break?"

Zhang Yifan shook his head: "I really can't sleep..."

"Okay," Chen Zhou let Zhang Yifan into the room, "Then help me build an analysis model."

Zhang Yifan was taken aback, and asked weakly, "What analysis model?"

When Chen Zhou saw Zhang Yifan's hand turning on the computer, he obviously paused, and immediately said with a smile, "Don't worry, the analytical model of the diamond film preparation process is very simple."

With that said, Chen Zhou walked back to his computer and dumped yesterday's research results to Zhang Yifan.

Immediately, another contact information was thrown to Zhang Yifan.

Zhang Yifan asked strangely, "Who is this person?"

Chen Zhou replied: "A senior from the Computer Department of Yanda University, the two of you work on this analysis model together."

Zhang Yifan snorted, and then added the contact information of the other party.

At this time, he realized that Chen Zhou had pulled someone in unconsciously.

This person is none other than the third person in the official UPC competition, Fang Jieming.

Originally, Chen Zhou was just trying to see if the other party was willing to help.

But what Chen Zhou didn't expect was that Fang Jieming readily agreed.

In addition to being pleasantly surprised, Chen Zhou thanked him again and again, and by the way, mentioned the matter of masturbating together.

However, Fang Jieming quickly said that he quit.

I haven't played since the last UPC ended...

After Zhang Yifan contacted Fang Jieming, they started to build the analysis model.

This is a very simple model. According to the estimates of the two, it can be done in more than two hours.

On Chen Zhou's side, he also opened up the information he sorted out before going to bed last night.

According to the trial and error ability of the wrong question set, the parameters of the preparation process are constantly adjusted.

"In the process of diamond preparation, under high methane concentration, there will be a large amount of hydrocarbon precursors on the substrate surface, and the mobility is low, and the supersaturation of hydrocarbon precursors on the steps is high."

"The hydrocarbon precursors on the steps are very easy to agglomerate with other hydrocarbon precursors and nucleate during the migration process."

"At the same time, hydrocarbon precursors are incorporated into the crystal at sites where no or little migration occurs."

"So, as the methane concentration increases, you end up with a random growth morphology."

Chen Zhou thought of this, and wrote on the draft paper:

[When the methane flux is low and the diffusion length of the hydrocarbon precursor is greater than the width of the steps, the supersaturation of the adsorbed species on the steps will be lower than the critical value required for nucleation. 】

[In this case, the hydrocarbon precursor that reaches the step layer will diffuse to another step, thereby forming laminar growth, which can produce a single epitaxial surface result, suitable for the preparation of single crystal diamond. 】

[Therefore, under the premise that the substrate has been selected, appropriately reducing the methane concentration can effectively suppress random growth, promote laminar growth, and increase the growth time and thickness of higher-quality diamond epitaxy. 】

After writing this passage, Chen Zhou glanced back and wrote a section next to it.

【2%~9%】

This is the wrong interval for the initially proposed volume fraction of methane.

With the same idea and method, Chen Zhou determined the trial-and-error intervals of working pressure, microwave power and substrate temperature.

But to find the most suitable parameter in this batch of intervals, it still takes time to polish.

As Chen Zhou thought earlier, the diamond preparation process itself is a contradictory issue.

Its growth rate will increase with the increase of methane concentration, working pressure and substrate temperature and other factors, but too high methane concentration and substrate temperature will reduce the quality of diamond.

At 11 a.m., Zhang Yifan and Fang Jieming completed the analysis model here.

Chen Zhou casually dumped a data parameter obtained through trial and error through the wrong set of questions to the two of them, and asked them to analyze it further through the analysis model.

The analysis model can preliminarily obtain the theoretical results of the current data parameters, which can be regarded as a further verification of the trial and error of the right and wrong problem sets.

Through this feedback information, Chen Zhou adjusted the trial and error interval, and verified again with the wrong set of questions.

After that, hand over the data to Zhang Yifan and Fang Jieming.

In this way, the cooperation between the three became more and more tacit.

The improvement of the diamond preparation process is also addressing the expected goals.

At one o'clock in the afternoon, after a short rest, the three of Chen Zhou started the follow-up work again.

Chen Zhou had a hunch that it should be done today.

(End of this chapter)