I Have a Research Support System

The first piece, efficiency 9.61%, 9.57%, 9.54%...

The second piece, efficiency 9.77%, 9.79%, 9.81%, 9.72%...

It seems that the true hot spin coating method is really effective and has broken the previous highest record.

Can it be further improved?

The third piece, the efficiency is 9.96%!

Breaking through 10% is interesting, Xu Qiu suppressed his excitement and continued the test.

9.99%, 9.99%, 9.97%, 9.92%...

The highest is only 9.99%...

Xu Qiu didn't believe in evil, and tested 30 sets of data in a row, but the more they tested, the lower they got. None of them started with 10%, and finally stabilized at around 9.6%.

The fourth piece, the fifth piece...

Measure all substrates.

The highest efficiency is 9.99%!

Are you playing me?

Could it be that the system is deliberately playing tricks on me?

The old thief of the system, come out for me. Xu Qiu shouted.

...

After waiting for a long time, he did not receive a response, and he gradually calmed down.

The system should not be so boring to tease him, it should be purely a matter of luck.

Although there is not much difference between 9.99% and 10%, for mild obsessive-compulsive disorder, this 0.01% cannot be raised, and it always feels uncomfortable.

Xu Qiu secretly made up his mind that even if he doesn't sleep tonight, he must improve this efficiency.

Just as he was about to leave the evaporation glove box and re-prepare a batch of devices, his gaze stayed in a corner of the glove box.

It was a bag of gleaming gold targets.

These gold targets are cylindrical, about 1 mm in diameter, about 3 mm in length, with shear marks on both ends.

From the looks of it, it should be cut from individual gold wires.

Xu Qiu suddenly discovered that he had been focusing on the improvement of the effective layer before, while ignoring the transmission layer and electrode materials.

It is relatively difficult to replace the transport layer, but it is relatively easy to replace the electrode material, especially the metal electrode on the top of the battery.

There are three commonly used metal electrode materials, namely aluminum, silver, and gold.

Aluminum is often used as an electrode in the laboratory. On the one hand, it is due to the price, and aluminum is the cheapest. On the other hand, the electrode material has little effect on the performance of the device.

However, when hitting high efficiency, the influence of electrodes cannot be completely ignored.

As for these three electrodes, which electrode is the best is not conclusive.

The work functions of the three electrodes are different, which will affect the energy level structure, which is different for different effective layer systems.

Therefore, if you want to know the result, you can only know after the experiment.

For the batch of devices just made, the processing condition corresponding to the highest efficiency of 9.99% is true hot spin coating at 110 degrees Celsius.

According to this condition, Xu Qiu quickly spin-coated four pieces.

Several material-216 laboratories he copied before are now in use.

He evaporated molybdenum trioxide/silver and molybdenum trioxide/gold in the evaporation glove boxes in two laboratories.

Test device.

Devices based on silver electrodes had the highest efficiency of 10.13%.

However, the performance of the device based on the gold electrode was reduced, only 9.68%.

It seems that the more expensive the material, the better, the most important thing is suitability.

Finally, the efficiency exceeded 10%.

I can sleep peacefully.

...

The next afternoon, the laboratory.

Wait for the atomic force microscope AFM test, I will go alone, Chen Wanqing said:

You come to make the device, and I will help you with all the preparations.

Okay. Xu Qiu nodded.

He copied the AFM skills of Mr. Xu Hui before, and he has already learned the operation method and the principle of the instrument, and he does not need to go to the scene to learn it again.

The AFM test can obtain the undulation of the film surface.

It brings a fine atomic-scale probe close to the surface of the sample, and there is a very weak repulsive force between the probe and the atoms of the sample to be measured.

Keeping this repulsive force constant, the distance between the probe and the sample can be considered constant.

The surface of the sample is scanned, and according to the position of the probe in the vertical direction, the height of the undulation of the sample surface at that place can be determined.

The operation is all controlled by computer software, and whether it can draw a good-looking image is a test of the skill of the operator.

In addition, one more thing to pay attention to is not to break the sharp probe.

Seeing the back of her senior going away, Xu Qiu silently prayed in her heart, hoping nothing would go wrong.

...

Spin coating, spin coating...

Xu Qiu was concentrating on the experiment when he suddenly saw a figure behind him in the reflection of the glass of the glove box.

Looking back, Han Jiaying was standing behind her, and she said:

Brother, is there anything I can do to help?

Xu Qiu thought for a while and said:

Not yet, you can watch me do the experiment first, and then find a chance for you to practice your hands.

Spin coating, evaporation.

Silver electrodes are used for evaporation today, and other conditions were explored last night.

Although the result was known in advance, Xu Qiu was still a little nervous.

After all, the experimental values ​​fluctuate. If this batch fails to reach 10%, several batches will have to be made again.

It is mainly the data made in the simulation laboratory, which is not easy to use directly.

When doing experiments by yourself, there are basically people watching the whole process, so it is difficult to create something out of nothing.

A simulation is a simulation, and reality is reality, so we should be more rigorous.

...

Xu Qiu directly found the substrate with the best conditions and tested it.

The highest efficiency is 10.18%.

Seeing that it was a little higher than the simulated result, Xu Qiu breathed a sigh of relief.

Brother, it's over 10%, over 10%! Han Jiaying shouted.

Why is this guy more excited than him.

It's normal to think about it, after all, I was already excited when I got the result last night.

Hearing the shout, everyone else in the lab was startled.

Duan Yun and Tian Qing walked over directly from the side, and even Wu Feifei, who was typing outside, stopped typing and came over.

Only Chen Wanqing was still testing the AFM next door and could not see this scene.

Wu Feifei: Congratulations, junior.

Tian Qing: 10%, yes.

Duan Yun: Don't forget to treat your guests when you post an article.

Although Wu Feifei and the others don't know much about organic photovoltaics, they can still get a general understanding through the group meeting.

It is also known that the efficiency of 10% is the weight in the current field of organic photovoltaics.

This is considered a big event in the laboratory.

...

After a while of excitement, everyone got busy again.

The juniors who have been in the research group for less than half a year are already so strong, so I have to work harder.

Tian Qing helped Xu Qiu's system to test CELIV and TOF.

Duan Yun set up the equipment, and Wu Feifei continued to write articles.

Xu Qiu got the key data and was in a good mood.

He taught Han Jiaying how to test the photoelectric performance of the device, and asked her to test the remaining devices.

I promise to complete the task. Han Jiaying looked excited and took over the glove box.

Of course, Xu Qiu will definitely not tell her, the main reason is that he knows that among the remaining devices, there is a high probability that there will be no higher performance ones.

...

It was close to half past five, and Han Jiaying finished the test.

She was a little depressed. The efficiency of the remaining devices was less than 10%. She thought she could find one that surpassed her senior brother.

Thanks to zywfmc and Ye Weishang Remnant Wind Burial for their 100-point reward.