I Have a Research Support System

Xu Qiu still had some questions about the simulation lab, so he asked the system:

"Can I enter the simulation laboratory in my dream?"

【No, it can only be entered when the host is conscious. 】

"Can that adjust the flow rate of time in the simulated laboratory?"

[The current permission level is insufficient and cannot be adjusted. 】

The system really doesn't give him any loopholes.

After confirming these two points, Xu Qiu began to clean the substrate.

This is his exclusive laboratory, so there is no need to be afraid that the washed substrates will suddenly disappear. For the convenience of future experiments, it is naturally better to wash more.

…………

Friday afternoon, lab.

After Tian Qing finished her graduation defense, she took a long vacation with Teacher Wei to travel, so there was only Chen Wanqing in the lab.

When Xu Qiu arrived, she was doing experiments in the glove box.

"Sister, are you preparing devices?" Xu Qiu asked.

"That's right, my six systems need to make a new batch of battery devices. Now the effective layer will be painted immediately, and I should be able to finish testing them today without working overtime." Chen Wanqing said.

"Okay, call me when it's time for vapor deposition, and I'll help you." Xu Qiu thought that his vapor deposition proficiency was not yet at the fourth level, so he took the initiative to take the job.

"Okay, hard work brother."

"fine."

Xu Qiu returned to his desk and sat down, and began to think about the arrangements for the exam week.

Reviewing is naturally the main theme, but reading literature, doing experiments, and exercising cannot be left behind.

Twenty-four hours a day.

To complete the three-week tasks, one hour of reading literature, one hour of long-distance running, two to three hours of experiments, eight hours of sleep, and two hours of eating must be set aside every day.

There are nine to ten hours left, so six hours of review and two to three hours of rest.

In terms of literature, it mainly depends on the project.

The title of the project is "Preparation and Characterization of Organic Solar Cell Devices Based on Flexible Substrates". The main difference from conventional solar cell devices is the substrate.

Therefore, first of all, it is necessary to find flexible materials that can be used as substrates, and secondly, to find out the problems faced by flexible substrates and corresponding solutions compared with traditional glass substrates.

In terms of experimentation, Xu Qiu does not plan to go to the laboratory, and plans to conduct it in a simulated laboratory, so that the experiment can be started or paused at any time, which is more convenient and flexible.

There are two main directions, one is to solve the problems encountered in the project.

The other is to explore the device preparation process based on the PTB7-TH donor. He plans to use PTB7-TH in the project instead of the P3HT used before.

According to literature reports, the highest efficiency based on PTB7-TH has reached more than 10%, and the acceptor materials used are traditional PC[60]BM and PC[70]BM.

Moreover, the experimental results have been repeatedly reported by multiple research groups, and this material is simply and crudely named PCE-10, which is currently a star donor material in the field of organic solar cells.

If you can't lead the way in scientific research, you still have to keep up with the trend.

"Student, you can evaporate it."

Chen Wanqing's voice brought Xu Qiu back to reality, he nodded, and asked:

"Sister, do you have any literature on flexible substrate organic solar cells?"

"It should be. Teacher Wei seems to have summed it up. I'll look for it and copy the electronic version to you later." Chen Wanqing said.

"OK."

…………

The senior sister has a total of 18 substrates, based on 6 groups of P3HT:PC[60]BM:PC[70]BM blend films with different ratios, and each group has 3 rotation speeds.

Xu Qiu carried out evaporation and testing, and everything went well.

The experimental results show that as the mass ratio gradually changes from 1:1:0 to 1:0:1, the photoelectric conversion efficiency of the device increases first and then decreases.

The extreme value is reached when the mass ratio is 1:0.2:0.8, and the highest efficiency is 5.52%.

Xu Qiu told the senior sister the results of the experiment, and then said:

"This is almost close to the world record. I remember the highest is 5.6%."

"The 5.6% is the P3HT:PC[60]BM benchmark system, we also added PC[70]BM, so there is no comparison." Chen Wanqing said:

"Like the P3HT system, if ICBA receptors are used, the efficiency reaches 7.2%.

And if you want to hit the world record, the battery device must go to a special testing agency for testing and issue third-party testing results before other researchers will recognize this data. "

"Is this because you are afraid of data falsification?" Xu Qiu asked.

"Yes, the cost of falsifying experimental data is almost zero. For example, if we change the effective area of ​​the test software from 0.09 square centimeters to 0.08 square centimeters, the efficiency can be increased from 5.52% to 6.19%, which is a direct increase of 12.5%.

If you don't do testing, you can't see any flaws at all from the experimental data alone. "Chen Wanqing said.

"No wonder there are so many reports of academic misconduct and academic misconduct every year. It is really easy to falsify results." Xu Qiu said.

"But a fake is a fake after all. Like a landmine, it will be detonated one day. Before, a certain principal was found to have falsified early scientific research results and was dismissed." Chen Wanqing said.

Xu Qiu nodded approvingly, and then asked:

"By the way, senior sister mixed several commonly used raw materials in this way, and increased the efficiency from 5.28% to 5.52%. Is it really meaningful?"

"It's really not very meaningful, it's mainly for practice." Chen Wanqing shrugged and said:

"However, this is the result of my one-year hard work. Even if it is a Chinese core journal, I have to find a way to publish it. And now, thanks to you, it is estimated that I can publish it in SCI District II.

Next, I will make PTB7-TH, and then modify it on the basis of it, synthesize new materials, and try to publish a few good articles. "

"Senior sister can definitely do it." Xu Qiu encouraged.

"By the way, we need to test the external quantum efficiency and EQE curve of the device later." Chen Wanqing said.

"I know this. It is used to calibrate the short-circuit current density. It is put together with the J-V characteristic curve in the literature." Xu Qiu said.

"Yes, the definition of EQE is very simple, it is the ratio of the number of electrons collected to the number of incident photons, usually its value is between 0 and 1, for example:

The external quantum efficiency of a certain battery device at 530 nanometers is 50%, which means that for every unit of photons with a wavelength of 530 nanometers absorbed, 0.5 units of photons are converted into electrons.

Because the test instrument is relatively large and cannot fit in the glove box, the substrate needs to be taken out for testing.

However, the effective layer and aluminum electrodes on the substrate will be oxidized in the air, so they need to be installed in a sealed sample holder for testing. "Chen Wanqing said.

Xu Qiu picked up the sample holder in the glove box and observed it carefully.

It is divided into two parts, both circular iron parts.

One part is a platform with quartz glass, and there is a square card slot on it, which can put a substrate.

The other part is a cover with eight probes. After the cover and platform are combined into one, the probes can just stick on the six aluminum electrodes and ITO electrodes of the substrate.

It is only necessary to test the EQE curve of the highest efficiency device under each condition, so only 6 pieces are tested.

Xu Qiu picked up a device under test with tweezers, placed the device with its back facing the quartz glass, put it into the platform, and then pressed the cover on.

Then tighten the three hexagonal screws on the cover, there is almost no gap between the platform and the cover, and it is difficult for external air to penetrate into the sample holder in a short time, which can provide a short-term oxygen-free environment.