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

It's not that he plans to sleep, but he will comb through the content of all the preparation processes later, so that it is convenient to fall asleep.

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

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

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 diamond films.

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 was simply impossible for him to do it.

Take one of the ideas he had at the beginning, that is, to match the quality of the diamond film prepared by the MPCVD method with the speed of the DAPCVD method.

It may seem beautiful, but there are infinite problems.

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

But for now, he's going to put that idea aside for a moment.

Purely from the improvement of the MPCVD method.

If you have the opportunity in the future, try to combine the two organically.

After taking a bath, Chen Zhou glanced at the time, and it was not yet three o'clock.

He thought about it for a moment and set an alarm clock for half past three.

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

What he needs now is a reference and corroboration of the data.

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

However, in the face of the powerful trial-and-error tool of the problem set, none of this is a problem.

On the contrary, it is very informative.

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

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

After saving the information on the computer and sorting out the scratch paper, Chen Zhou climbed into bed and went to bed.

The next day, at half past seven 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 washed up briefly, and then went to the hotel restaurant to solve breakfast.

I went back to my room and hung a Do Not Disturb sign at the door.

Today, he is going to 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.

Outside the door, standing 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 it is far less nervous than you, how to say it, it is very fulfilling and energetic......"

Chen Zhou quipped: "You want to say nervous and exciting, right?"

Zhang Yifan: "Uh...... It's almost ......."

Chen Zhou glanced at Zhang Yifan: "Are you sure you won't rest?"

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

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

Zhang Yifan was stunned for a moment, and asked weakly: "What analysis model?"

Chen Zhou saw Zhang Yifan's hand on the computer, paused obviously, and immediately said with a smile: "The analysis model of the diamond film preparation process is rest assured and very simple. ”

As he spoke, Chen Zhou walked back to his computer and threw yesterday's research results to Zhang Yifan.

Immediately, Zhang Yifan was given a contact information.

Zhang Yifan said strangely: "Who is this person?"

Chen Zhou replied: "A senior in the Department of Computer Science of Yan University, the two of you work together on this analysis model. ”

Zhang Yifan sighed, and then added the other party's contact information.

At this time, he realized that Chen Zhou had unconsciously pulled another person.

This person is not someone else, the third person in the official UPC competition, Fang Jieming.

Originally, Chen Zhou just gave it a try to see if the other party was willing to help.

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

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

It's just that Fang Jieming hurriedly said that he had quit.

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

After Zhang Yifan and Fang Jieming got in touch, the two began to build an analytical model.

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

Chen Zhou's side also opened the information sorted out before going to bed last night again.

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

"In the process of diamond preparation, at high methane concentrations, there will be a large number of hydrocarbon precursors on the substrate surface, and the mobility is low, and the supersaturation of hydrocarbon precursors on the steps is high. ”

"During the migration of hydrocarbon precursors on the steps, they are very easy to agglomerate with other hydrocarbon precursors and nucleate. ”

"At the same time, where migration is not occurring or where migration is low, hydrocarbon precursors are incorporated into the crystal. ”

"As a result, as methane concentrations rise, it eventually leads to irregular growth topography. ”

Thinking of this, Chen Zhou wrote on scratch paper:

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

[In this case, the hydrocarbon precursor that reaches the cascade will diffuse to another step, resulting in laminar flow growth, which can produce a single epitaxial surface result, suitable for the preparation of single crystal diamonds.] 】

Therefore, under the premise that the substrate has been selected, an appropriate reduction of methane concentration can effectively inhibit irregular growth, promote laminar flow growth, and increase the growth time and thickness of higher-quality diamond epitaxy. 】

After writing this paragraph, Chen Zhou glanced back again and wrote down an interval next to him.

【2%~9%】

This is the staggered interval for the preliminary proposed methane volume fraction.

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

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

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

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

At 11 o'clock in the morning, Zhang Yifan and Fang Jieming completed the construction of the analysis model.

Chen Zhou casually threw a data parameter that was tried and wronged through the wrong question set to the two of them, and asked them to analyze it further through the analysis model.

The analytical 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 correct and wrong question set.

Through this feedback information, Chen Zhou adjusted the trial-and-error interval and re-verified it with the wrong question set.

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

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

And the improvement of the diamond preparation process is also solving the expected goals.

At one o'clock in the afternoon, after a short break, Chen Zhou and the three of them devoted themselves to follow-up work.

Chen Zhou has a hunch that he should be able to do it today.