I Have a Research Support System

Under the careful guidance of Xu Qiu, Han Jiaying spent more than 20 pieces of glass, and finally became familiar with the experimental operation of true hot spin coating.

It can be clearly seen that her operation speed and experimental fluency have improved a lot.

Now, except for the large circle in the center, the surface of the thin film obtained by her spin coating is basically smooth, and no solid particles appear anymore.

This also shows that the bumps on the film were caused by the precipitation of the polymer after the solution was spin-coated for a long time, rather than insoluble matter in the solution itself.

Assuming that there is a problem with the material itself, no matter how you improve the spin coating method, it will not help, and you can only re-synthesize and process the polymerization product.

During this period, Xu Qiu also discovered another problem, he asked:

Did you make devices before, and the spin coating speed was 3000r.p.m.?

Yes, I remember your P4T system, the best speed is 3000, I just used it directly, is there any problem? Han Jiaying said.

Yes... Xu Qiu said halfway, and then stopped abruptly, deliberately putting off a trick.

What's the matter? Han Jiaying straightened her head and waited for a long time, but he stopped talking and said anxiously:

Brother, you said...

You can think for yourself, what will the spin coating speed affect? Xu Qiu said.

Affect... the thickness of the film. Han Jiaying said.

That's right, so besides the speed, what other factors affect the film thickness? Xu Qiu said.

Also, the concentration of the solution? Just after finishing speaking, Han Jiaying suddenly realized:

I understand. I changed the solution concentration of P5T, but did not change the corresponding speed. I need to lower the spin coating speed of P5T, right?

Bingo, this is also a direction that can be improved, Xu Qiu said:

In fact, you can also find by observing the film that the color of the P5T film is obviously lighter than that of the other two P2T and P3T, which means that their film thickness is different.

Han Jiaying picked up a few substrates with tweezers, observed carefully, and said:

Really, I didn't notice it before.

When doing an experiment, you must pay more attention to the observation of the experimental phenomenon, and when you encounter an abnormal situation, you must think about the reasons behind it. Xu Qiu said:

Let me give you a suggestion. When making devices, especially at the beginning of the trial, it is best to set a few more gears for the spin coating speed, such as 2000, 3000, 4000.

On the one hand, it is because the speed is easy to adjust, and the influence of the speed is usually more obvious;

On the other hand, the concentration of the solution prepared each time will change with use or with the passage of time.

Okay, I'll remember. Han Jiaying said.

Okay, other steps, I don't see any problems for the time being, your overall performance is still good, keep going.

In the end, Xu Qiu did not forget to encourage the junior girls.

The cost of encouraging others is almost 0, but sometimes it is very precious to others.

Yeah. Han Jiaying nodded seriously.

...

Keep experimenting.

After Han Jiaying solved the big problem of the true hot spin coating method, she spin-coated the effective layer on the zinc oxide substrate without any problems.

The subsequent evaporation was also very smooth.

However, after the evaporation was over, it was almost five o'clock.

For device testing, it will definitely not be done within half an hour.

It looks like I have to work overtime again.

Xu Qiu has been watching Han Jiaying today, and he didn't write a single word in his article.

I have no choice but to comfort myself and help my juniors, which is a long-term investment, worth it!

How do we solve dinner, order takeaway? Xu Qiu asked.

For dinner, how about I invite senior brother to eat outside? Han Jiaying suggested.

How embarrassing it is to make you spend money... Where shall we eat? Xu Qiu asked.

Han Jiaying was amused by him, thought for a while, and said, Little Beiguo.

Okay. Xu Qiu agreed.

He has never heard of this name, and it is most likely not a Sichuan restaurant, but when others treat guests, they naturally eat whatever they choose, and there is nothing to choose.

Han Jiaying stared at the evaporated substrate and said:

Which piece is better to start with?

Let's just pick the P3T system with the highest efficiency last time. The experimental conditions haven't changed much this time, so it's most likely to be the highest, Xu Qiu said.

good.

Han Jiaying clamped the substrate, connected the source meter, opened the software, and started the test.

5.88%, 5.96%, 5.93%, ...

The highest efficiency is 5.96%!

Seeing the result, Han Jiaying said excitedly:

Brother, 6%, it's close to 6%.

Compared with the previous 4%, the improvement is quite considerable.

Moreover, this is a preliminary test, and after further optimization, it is still possible to achieve 7% or even 8%.

As for a higher value, it is not yet clear whether it can be achieved.

Congratulations, junior, you have booked an article in advance. Xu Qiu said.

Really? You can post articles? Han Jiaying couldn't believe it.

She has read few literatures, and she is not quite clear about the status of her current experiment.

I only know the efficiency of Xu Qiu's system before, but it has reached 10%. Can she still publish articles with 6%?

Yes, in the field of organic photovoltaics, 6% is considered a threshold, Xu Qiu said:

You have reached the threshold now. If you can achieve 7% or 8%, it will be more stable.

Great, thank you brother. Han Jiaying said.

This thank you is from her heart.

She was not stupid, and soon figured out that even if she was able to publish the article, it was mainly Xu Qiu's credit.

What she was given to make were three derivative materials with a molecular structure similar to P4T.

The foundation of P4T is there, no matter how bad your luck is, you can always produce one or two materials with good performance.

Even if it does not reach 10% of P4T, it is not difficult to reach 6% or 8%.

In addition, Xu Qiu taught her from the idea of ​​the experiment to the operation of the experiment, and only the specific experiments were done by herself.

How about, brother, let's be together... Han Jiaying tentatively asked.

Seeing that Xu Qiu was silent, she said again:

Or I can take the second work.

Xu Qiu was a little helpless, Han Jiaying was like this, and Chen Wanqing was like this before, why were they all so polite to him.

Isn't it just an article in the second district, and it's still giving way.

He didn't give the articles casually, the senior sister was there to repay her for her guidance, and the junior sister was here for long-term investment.

You can use this job to practice. Once I do it for you, it will be my gift to you. Xu Qiu said:

Now I don't lack articles from the second district, and there are two more to be published later.

Really? Han Jiaying said happily, Then I'll treat my brother to dinner another day?

Okay, that's the deal. Xu Qiu said.

Keep testing.

Another sample of the P3T system has a higher efficiency of 6.14%.

In the P2T system, the highest value is only 2%, while in the P5T system, the highest value has also increased to 5%.

It seems that P3T and P5T have the opportunity to be split into two articles.

Is it just too watery?

Let's think about this issue later.

The list will be updated on Monday tomorrow, and a wave of recommendation tickets is expected. Next week's classified cover, the editor said that there is hope for Sanjiang, and I hope that book friends will support it. Because the evaluation of a new book is mainly based on follow-up reading, but the author cannot see this data, and can only estimate how many readers are following the book from the recommendation tickets. If the number of recommendation votes is large, the author will be more confident, so casting a recommendation vote every day is the greatest encouragement to the author. I originally wanted to write it three times, but there are too many words, so let’s save it and wait for it to explode. Because if it is full of recommendations, there will be Six Bands and Sanjiang in the back, and it is estimated that 40W words will be put on the shelves... If you can go to Sanjiang, 2W words will burst out...