I Have a Research Support System

Back in the dormitory, only Ren Bin was there, and Tao Yan didn't know where to go.

Seeing that Ren Bin was still playing games, Xu Qiu walked up to him and held out his hand.

Ren Bin asked suspiciously, Xu Qiu, what are you doing?

What do you think? Xu Qiu asked back.

Ren Bin suddenly thought of what he said after class in the morning, and said with a sad face:

Okay, last round.

After the game was over, Ren Bin unplugged the keyboard and mouse from the host computer with a face of reluctance, and handed them to Xu Qiu.

No spare?

have……

take it out.

Xu Qiu found an empty wardrobe, put two sets of peripherals in it, and locked it.

He threw the key on his desk and said, If you want to play, go and get it yourself.

Don't try to tempt me, I've made up my mind again. Ren Bin grabbed the key, walked to the window, saw no one around, and threw it out.

Xu Qiu shook his head with a smile and said, Fortunately, I have spare keys, otherwise you will have to hire a locksmith if you want to take them out again.

…………

Sunday, lab.

When Xu Qiu arrived, he found that the place was much busier than usual.

Including senior sister Chen Wanqing, there were three women and one man, sitting around the desk.

One of the seniors was looking at the PPT on the computer and giving a speech very fast.

Xu Qiu guessed that she was Tian Qing who was about to participate in her graduation defense.

After confirming her identity, the identities of another man and a woman were also revealed—Duan Yun and Wu Feifei respectively.

After seeing Xu Qiu, Chen Wanqing pulled away the office chair next to her, and waved to him.

Xu Qiu understood, went to sit next to her, and listened to Tian Qing's speech with the others.

He can still understand the general content:

Qing Tian used the time-of-flight method TOF and the linear carrier boosting method CELIV to study the charge transport mechanism in the benchmark organic solar cell device based on P3HT:PC[60]BM.

However, the specific analysis process and experimental details do not understand.

It was an illustration in the PPT that caught his attention.

The illustration is hand-painted. In the picture, a girl is wearing a lab coat and goggles, operating two instruments, and TOF and CELIV are marked next to the instruments.

Tian Qing probably drew it herself, Xu Qiu thought.

The time for undergraduate defense is generally short, and Tian Qing ended her speech very quickly.

Wu Feifei stopped the stopwatch on her phone and said, It took nine and a half minutes, and the time was well controlled.

That's good. Our requirement is ten minutes for speeches and five minutes for questions. Tian Qing paused and said, What do you think of what I said? Do you have any questions?

Everyone looked at each other, but no one answered.

Okay. Tian Qing helplessly spread her hands.

She noticed Xu Qiu, took the initiative to walk towards him, and said, Are you a new student?

Yes, hello, Senior Sister Tian Qing, I'm Xu Qiu, a junior in material chemistry, and I just applied for graduate school, Xu Qiu said.

Tian Qing smiled and said: You know who I am, did Teacher Wei mention me to you?

Well, Teacher Wei told me about you when I first came here. Xu Qiu said.

Tian Qing covered her mouth and smiled: That's right.

After dismissing Tian Qing, Xu Qiu greeted Wu Feifei and Duan Yun respectively, but both of them were busy, so they only responded politely to Xu Qiu.

Duan Yun looks about 30 years old, with slightly dark skin, wearing a plaid shirt and shorts, like a person who has experienced ups and downs, with a sense of vicissitudes.

Wu Feifei was dressed as a student, staring at the computer screen intently, typing on the keyboard quickly with both hands.

Suddenly, the sound of leather shoes da da da came from the corridor, and Xu Qiu saw the senior sister sitting next to her subconsciously sit up straight.

Xu Qiu looked up and saw that it was Mr. Wei coming.

They're all there, Teacher Wei glanced around, and then asked one by one: Wu Feifei, how are you changing, show me.

Wu Feifei didn't raise her head, she still operated the computer quickly with her hands, and said, It will be ready soon.

Okay, come to me after you fix it. Tian Qing, how are you preparing for your defense?

Just told them about it, and I think it's okay.

Okay, I've finished reading Wu Feifei's article, and I'll read it for you later.

Okay. Tian Qing nodded.

Wei Xingsi looked at Duan Yun and Chen Wanqing: Hurry up and write your articles, too.

After receiving the responses from the two, he finally turned to Xu Qiu:

Xu Qiu, are you still used to it here?

I feel pretty good here. Xu Qiu said.

Wei Xingsi nodded in satisfaction, turned and left.

Not long after, Wu Feifei unplugged the USB flash drive and walked to the 218 office next door.

Tian Qing kept flipping through the defense PPT, while Duan Yun buried himself in typing.

Xu Qiu found the senior sister and asked, How about today's experiment, how to apply the effective layer?

Just use the six bottles of solution you prepared for me before, and I'll write it to you if you can. Chen Wanqing wrote while talking, and then handed the written note to Xu Qiu.

She continued: I will teach you evaporation after painting. This time, it is mainly to help me supplement data and do repeated experiments on device performance.

Okay. Xu Qiu said.

He also learned through the literature that the so-called repetitive experiments refer to:

Use the same experimental conditions to repeat an experiment to obtain multiple sets of experimental data. After removing the abnormal data, calculate the average value, extreme value and standard deviation of the remaining data as the final data.

This can effectively prevent the distortion of experimental data caused by accidental conditions and avoid erroneous experimental conclusions.

For example, in the field of organic solar cells, the most important performance index is the photoelectric conversion efficiency of the device.

So make many batches of battery devices, and then give the highest efficiency, average efficiency and standard deviation.

The higher the grade of the journal, the higher the reviewer's requirements for repeated experiments, and will ask to repeat 10, 20 or even more times.

…………

After doing the protective work, Xu Qiu put the two boxes of substrates made on Friday into the glove box.

The procedure for spin-coating the active layer is the same for both substrates coated with PEDOT and ZnO respectively.

Xu Qiu first checked the six solutions prepared earlier, and found that they were all dissolved well and could be used directly.

Then he clamped a piece of substrate, took 60 microliters of solution with a pipette gun, and dropped it on the center of the substrate.

Start the homogenizer, the condition is 1200r.p.m., 60 seconds.

Remove the coated substrate, put it into a new Petri dish, cover it and wait until the surface of the substrate turns black, and then put it back into the original Petri dish.

This step is solvent annealing, which uses the residual solvent after spin coating to induce crystallization of the polymer in the film, thereby improving the microscopic morphology of the film.

Next, thermal annealing at 130°C for 20 minutes.

Then, wipe the slides with chloroform solvent.

Finally, make a mark on the back edge of the substrate, such as: 1:1:0, 1200r, 1:0.4:0.6, 1200r and so on.

The senior sister had already written these experimental operations on the sticky notes, so he didn't need to think about it, he just had to follow it.

If he conducts the experiment himself in the future, then he must consider all the experimental details:

For example, whether the pipette gun takes 60 microliters or 70 microliters of solution at a time; whether the spin-coating speed is 1200, 1000, or 1500 r.p.m.; whether the concentration of the solution is 20 or 24 milligrams per milliliter, and so on.

Thank you for the 100-point reward from the medical monk who loves to read