I Have a Research Support System

Xu Qiu went to the cafeteria to have dinner with her senior sister and Tian Qing.

"Chen Wanqing, where do you think I should go on my graduation trip?" Tian Qing asked.

"Hmm..." Chen Wanqing thought for a while, then said, "Chuan Sheng, how are you doing?"

"Not too good, I'm not used to spicy food." Tian Qing turned her head and asked, "Xu Qiu, do you have any suggestions?"

"Tibet Province?" Xu Qiu said.

"Tibetan province, I heard that there will be altitude sickness, it's too dangerous." Tian Qing said.

"By the way, why did senior sister Tian Qing think of going on a graduation trip?" Xu Qiu said.

"The senior year vacation is the last long vacation. There is no two-month vacation like this after graduation," Tian Qing spread her hands and said:

"The winter and summer vacations for graduate students are usually two weeks to one month, and our group is only two weeks."

...

After dinner, Xu Qiu returned to the laboratory and continued to work.

The vacuum has reached the standard, and he carefully operates the main console of the evaporation machine. After all, he has only operated this machine twice, and he is not proficient enough.

Fortunately, no accident happened.

After the end, Xu Qiu took a look at the proficiency of the vapor deposition, and it reached 70% of the third level, and it should be able to reach the fourth level if it is done again.

Looking at the silver substrate in front of him, Xu Qiu felt like a parent looking at their own children.

I have raised you up (done well), you have to fight for me.

start testing.

The first piece, marked with "DCB, 1200", is a piece of substrate under the reference condition, which is the same as the batch made for the senior sister on Sunday.

Six points, the highest efficiency is 4.18%, and the average efficiency is 4.03%.

It was a bad start. At that time, the highest was 4.4%, but this time it was only 4.18%.

Is there a problem with which step of the experiment?

Xu Qiu couldn't help but start to doubt.

Keep testing.

The second piece, up to 4.12%.

The third piece, up to 4.23%.

The fourth piece, up to 3.88%.

...

The twelfth tablet, the highest 3.92%.

...

They are all samples prepared by the normal spin coating method, and the efficiency is lower and lower as the test is performed.

Every time a piece is measured, Xu Qiu's heart becomes colder.

Moreover, he found that after spending 500 credits, the homogenizer skills learned from the system did not work at all, and the performance of the device could not be improved after starting with low speed and then high speed.

There are only nine pieces of devices prepared by spraying method left, and Xu Qiu doesn't have much hope for them.

He picked up a piece of substrate marked "DCB, 1200, P" and started testing.

"drop."

After hearing the notification that the voltage scan was over, Xu Qiu glanced at the efficiency.

4.70%!

I read it again carefully, and I saw it right.

"I*!"

Xu Qiu couldn't help shouting, and waved his fist in the air, but it hit the glass inside the glove box,

"Ah! It hurts so much." Xu Qiu gasped. Fortunately, the glove box was relatively heavy, and the shock absorption performance was very good, so no accident occurred in the experiment.

"Xu Qiu, what's the matter with you?" Hearing his shout, Chen Wanqing asked with concern.

"It's okay, I stepped on my own foot just now." Xu Qiu decided to wait for all the tests to be completed before notifying the senior sister of the results.

He has a hunch that there may be higher data later, maybe even more than 5%.

In the end, the highest efficiency of this substrate was 4.73%.

He changed the dichlorobenzene solvent again, and the substrates at the other two rotational speeds had the highest values ​​of 4.62% and 4.55% respectively.

Although they all exceeded the previous highest value of 4.5%, but there is still a certain gap from the 5% required to complete the task.

The chlorobenzene group was tested next.

The results were not satisfactory, with the highest efficiencies at the three speeds being 4.10%, 4.22% and 4.28%, respectively.

Finally, there are only three substrates with chloroform solvent left, can it bring a miracle?

The first piece, "CF, 1000, P".

After installing the substrate and pressing the start button, Xu Qiu focused on the computer, waiting for the result.

4.80%.

There is a show!

Xu Qiu secretly cheered and continued the test.

In the end, the highest value was 4.84%.

The second film, "CF, 1200, P", had the highest value of 4.92%.

The last piece, "CF, 1500, P".

You must work hard.

After Xu Qiu clicked to open it, he closed his eyes. He didn't open them until he heard the scanning end sound.

Take a closer look, 4.95%.

Continue to scan, 4.98%, 4.94%, 4.97%, 4.88%, 4.93%, ...

The highest value is 4.98%.

I scanned several other points, and there was no higher value.

In general, in the case of a uniform film, the first point is usually the most efficient, because only it is tested from the initial state, and when it is irradiated, other points are also exposed to light.

…………

Do you want to do this to me? It's only 0.02%.

Xu Qiu returned to the desk with a disappointed face.

Seeing Xu Qiu's appearance, Chen Wanqing comforted her, "Xu Qiu, it's normal for the experiment to fail. When I first debugged the equipment, I was so happy to have 1% efficiency."

Then, she asked: "Right, what is the highest efficiency of the junior today?"

"4.98%." Xu Qiu replied weakly.

"How much?" Chen Wanqing thought she had heard it wrong, so she asked again.

"4.98%." Xu Qiu said.

"Really?" Chen Wanqing stood up excitedly and almost bumped into Xu Qiu's body.

"Senior sister, please slow down." Xu Qiu was afraid that she would fall, so he hurriedly helped her up.

"Quick, show me your data." Chen Wanqing pulled his sleeve and walked into the laboratory.

"Isn't it 4.98%?" Xu Qiu said, "Senior sister, walk slowly, I'm thinking about how to get it to more than 5%."

"I'll tell you the simplest method, keep two significant figures, round up to 5.0%." Chen Wanqing joked.

Xu Qiu was speechless. It is true that writing articles can do this for the sake of beautiful data, but now I have to complete the task, and the system does not recognize this method.

Seeing that he was silent, Chen Wanqing said, "Tell me about the experimental conditions."

"Chloroform solvent, 10 milligrams per milliliter, P3HT:PC[60]BM, mass ratio 1:1, rotation speed 1500r.p.m., solvent annealing, thermal annealing, evaporation and other conditions have not changed." Xu Qiu said.

"Have you made any other speeds?"

"I also made 1000 and 1200 speeds, and the efficiencies were 4.84% and 4.92% respectively."

"Ah! I thought of it." Xu Qiu suddenly shouted excitedly.

"I...I thought of it too." Chen Wanqing said weakly: "Then you go ahead."

"Now there is a positive correlation between efficiency and rotation speed, so the extreme point may not be 1500r.p.m., but higher, so you can make a batch of substrates under high rotation speed conditions, such as 1800, 2000, 2500r.p.m.."

"Hmm, it's similar to the method I thought of. By the way, how did you do it, junior?" Chen Wanqing asked puzzled; "I have also tried chloroform and chlorobenzene solvents before, and finally found that dichlorobenzene has the best effect. "

"Naturally, a special technique was used. Senior sister, come here and let me show you." Xu Qiu said.

Afterwards, he entered the glove box and demonstrated the operation of the spraying method to the senior sister.

"It's still possible to spin coat like this?" Chen Wanqing exclaimed with her mouth opened in an O shape.