I Have a Research Support System

After preparing the three sets of solutions, Xu Qiu said goodbye to his senior sister and left the laboratory.

The one-month exam month will start next week.

He has only taken 14 credits this semester, a total of 6 courses, and the exam pressure is not high.

However, it is still necessary to review carefully to prevent overturning. After all, not being able to fail a course is a rigid indicator of the insurance research.

Therefore, Xu Qiu decided to catch up with the progress of the experiment this week, at least to verify all the previous ideas.

…………

On Tuesday, Xu Qiu had lunch and arrived at the laboratory at one o'clock.

In the corridor, he deliberately imitated Teacher Wei's footsteps, walking da da da.

Pushing open the door of room 216, Xu Qiu and Chen Wanqing met each other's eyes.

Ah, it's Xu Qiu. Chen Wanqing took a long breath and said, I thought it was Teacher Wei who came. You did it on purpose.

Of course not. The soles of my shoes are hard, so the sound is relatively loud. Xu Qiu naturally refused to admit it, walked behind her and said:

Senior sister, what are you doing, sneaking around.

Watching the drama, I thought it was Mr. Wei just now, so I closed the webpage. Chen Wanqing said.

Isn't it just one o'clock now, and it's not working hours, so it's fine even if Teacher Wei finds out. Xu Qiu said.

I was caught by him twice before while chasing dramas during working hours. Although he didn't say anything, I'm rather timid, so try not to be noticed by him when paddling. Chen Wanqing said:

By the way, you can report your student number to me, and I will help you apply for opening the access control of the laboratory.

1230713XXXX. Xu Qiu said.

Yeah, I'll send an email to the teacher in charge of access control in the department. Chen Wanqing said.

Okay, senior sister, then I'll do the experiment. Xu Qiu said.

So positive, Chen Wanqing said, Okay, you go, pay attention to safety.

She originally planned to teach Xu Qiu how to use a UV-Vis spectrophotometer to test the light absorption performance of the active layer film, and then asked him to help her measure a few samples.

Now seeing his full of energy, Chen Wanqing decided to test it by himself or wait a few days.

She was very curious about what new experimental idea Xu Qiu had, but he didn't want to say it, and it was hard for him to ask further.

Thinking back to when I first entered the laboratory, I was always repeating other people's work, proficient in various instruments in the laboratory, and had no new ideas at all.

It was not until later that the amount of literature reading increased that I figured out the routines in this field.

So I chose a donor and two acceptors to blend, and found that the performance of the device was increased from 4.5% to 4.8%, and then I did characterization and tried to tell a story.

The materials are all bought and mixed by yourself. In fact, there is not much innovation, just in the water article.

Why can't I graduate without posting articles? The requirement in the group is four SCI second districts. She doesn't know if this article can be admitted to the second district, maybe it can only be published in the third district.

She also thought that her junior was only a junior, so talented in scientific research, and so diligent.

People who are better than me work harder than me, so how can I be addicted to TV dramas.

After pouring herself a big bowl of chicken soup, Chen Wanqing closed the webpage and continued writing her article.

…………

After Xu Qiu took protective measures, he started the experiment.

He first turned on the ultrasonic cleaner, cleaned the substrate, and then entered the glove box to check the dissolution of the solution prepared yesterday.

After inspection, all three bottles were dissolved very well.

Among them, the chloroform solution is special because its boiling point is 61.7 degrees Celsius, and the set temperature of the rotary heating platform is 60 degrees Celsius, so Xu Qiu first put it on the lid of a petri dish, and then placed it on the heating platform.

There was still some zinc oxide prepolymer solution left from last time. Xu Qiu found that its color changed from colorless and transparent when it was first prepared to a color similar to egg white, slightly yellowish.

He had asked the senior sister the reason for this color change before.

Chen Wanqing told him that she didn't know the specific reason, only her experience.

According to her experience, the performance of the battery device prepared with this kind of slightly yellowed prepolymer solution will be better than that of the newly prepared solution, but the difference will not be too great.

However, if you continue to leave it for a long time, the solution will eventually turn a dark yellow color similar to urine, and then it cannot be used.

Applied scientific research, such as materials, is usually result-oriented.

That is to say, the researchers first get a good result through continuous trial and error, and then go back and analyze the reasons for such a good result, put forward conjectures, and then determine the direction of the next trial and error, and repeat Carrying on, pushing the field of research forward slowly.

So many times, the cause is unknown.

...

Xu Qiu washed the substrates, spin-coated zinc oxide prepolymer solution, and obtained 24 pieces of ITO/zinc oxide substrates after annealing.

Looking at the time, it was past three o'clock.

After thinking about it, he decided to work overtime today to finish this batch of devices and test them out.

Continue to spin-coat the effective layer, a total of 15 experimental conditions, each of which must have at least one slice.

The normal spin-coating operation is relatively simple, Xu Qiu did not make any mistakes, and obtained a film that evenly covered the entire substrate.

The spraying method is more difficult, and he spent 500 points to exchange for a one-time teaching, and the existing points are not enough to redeem again.

Without the real-time guidance of the system, Xu Qiu can only rely on the memory in his mind to explore the conditions by himself.

For the first time, he held the pipette perpendicular to the substrate as in a normal spin coating operation and sprayed directly, resulting in a large hole in the center of the film.

For the second time, he sprayed the pipette gun at an angle, but his hand shook a little during the operation, and finally there was obvious delamination on the film.

After two failed experiments, Xu Qiu decided to use a glass plate instead of an ITO substrate to try the hand feel.

The spraying method saves solution, 1 ml of solution can be sprayed more than 40 times, while spin coating can only be used about 15 times, so it is not afraid of waste.

He used the solution left over from last time, and after more than a dozen practice sessions, he finally summed up the tricks of operation:

First cut off the pipette tip from the middle, draw 20 microliters of solution, and press the start button of the homogenizer;

Then aim at the edge of the substrate at a distance of about 5 cm from the tip of the pipette, and squeeze out all the solution at an angle of about 45 degrees;

During the whole process, the hand shake should not be too large, and the solution must be squeezed out quickly.

Count the number of remaining substrates: there are 24 substrates in total, 17 have been used, and 7 are left.

After thinking for a moment, Xu Qiu decided to change the conditions of experimental group B to:

Chloroform (10 mg per ml, 1:1), chlorobenzene (16 mg per ml, 1:1), dichlorobenzene (20 mg per ml, 1:1); speed 1000, 1200, 1500; spraying method.

In this way, just 6 substrates can be used again, leaving 1 substrate.

There were no surprises in the next experiment. Xu Qiu solvent annealed, thermal annealed, and wiped the spin-coated substrate.

Then transfer to another glove box, after installing, start the evaporation device, and start vacuuming.

Finally, I went back to my desk to rest, and waited for half past five.