"With your reputation, it will be easier for you to apply for some scientific research funds later, and you can get more money.

But don’t worry about this matter for now. I will talk to you slowly later. Let me tell you about another thing first.

Professor Gong Qi from the Institute of Physics will be coming over soon. Their research group is conducting a study on perovskite solar cells. He said he has something he wants you to help with..."

Dean Yang was talking to Zhao Xiancai when the door of his office was knocked again.

"It seems he has arrived. I'll open the door."

After hearing the knock on the door, Dean Yang quickly walked over and opened the office door.

"Hello, Dean Yang."

"Hello, Professor Gong, please come in quickly. This is the classmate Zhao Xiancai you are looking for."

After Gong Qi and Dean Yang met, they first said hello to each other, and then Dean Yang let Professor Gong into the office and introduced Zhao Xiancai to him.

"This is classmate Zhao Xiancai? Although I am from the School of Physics, I have always heard about you. I know you are young, but when I see you in real life, I still feel that you are so young.

A little too much.

It’s really incredible, the School of Science and Technology has really produced an extraordinary genius this time.”

After seeing Zhao Xiancai, Gong Qi also praised Zhao Xiancai.

"He has heard this a lot, and I guess he is used to it. Academician Gong, you should tell him what you are looking for."

Dean Yang said, it can be seen from the name he addressed Professor Gong in this sentence that Professor Gong Qi is still an academician.

"Yes, yes, let's get down to business.

In order to explain it more clearly, let me start from the beginning.

That's it, didn't you go to Princeton University in the United States to attend a mathematics seminar two days ago?

You also gave a report on the proof of the Gross-Stark conjecture at that seminar. Someone uploaded the video of your report on the Internet. It should have been uploaded by a student at Princeton University who listened to your report at the time.

Our 'optical research innovation team' has cooperated with Dr. Liu from the Lawrence Berkeley National Laboratory, Professor Thomas P. Russell from the University of Massachusetts, and Dr. Zhang and Professor Henry J. Snaith from the University of Oxford in the United Kingdom to study lead acetate precursors.

High-efficiency perovskite solar cells.

Yesterday, our partners in the United States saw your video and sent it to us, and we have also watched it.

In your report on the proof of the Gross-Stark conjecture, a computer-based mathematical simulation program you used may be helpful to our research, so we would like to ask you to do us a favor."

After listening to Dean Yang's words, Academician Gong Qi also told the whole story and the purpose of their coming to find Zhao Xiancai without any delay.

The computer program he was talking about that performs mathematical simulations was originally designed by Zhao Xiancai to find the relationship between system tasks and rewards. However, it was accidentally used by him in Hilbert's 12th Mathematical Problem.

On difficult issues.

But at least for now, that program was not of much use when Zhao Xiancai was studying the Abelian expansion problem.

"Solar cells? But, Academician Gong, I don't know much about physics. Apart from the physics courses required by the college, my other physics knowledge is almost at the high school level."

After hearing what Academician Gong said, Zhao Xiancai said in a daze.

A few days ago, Professor Witten asked him if he wanted to change his major to physics. At that time, Zhao Xiancai said that he had no such idea for the time being. Now that he came back, another physics professor from Peking University came to see him.

Zhao Xiancai even wondered if they were colluding, although this was unlikely.

"It's okay. Your main job actually doesn't involve much professional knowledge. We just need you to use your program to do a photoelectric conversion of a trans planar junction perovskite solar cell based on lead acetate precursor before our experiment.

Predictions for improved efficiency and a little bit of data analysis.

Therefore, you only need to have a general understanding of the relevant knowledge.

Of course, if you are willing to have a deeper understanding, I would also be happy to do so.

I have sorted out the teaching materials you need to read, and they are all in this USB flash drive."

With that said, Professor Gong took out a USB flash drive from his pocket, handed it to Zhao Xiancai, and continued to say to Zhao Xiancai: "If you just want to have a rough understanding, just read the first two books.

If you want to know more about it, you can read the books inside.

I just don’t know if you are willing to help us with this."

"Thank you, Academician Gong. I will take a closer look when I have time when I go back. I don't have anything too important to do now, so I will definitely help you with this."

After taking the USB flash drive handed to him by Academician Gong, Zhao Xiancai said.

Afterwards, Academician Gong talked to Zhao Xiancai about the basic situation of their research.

With the increasing environmental and energy problems, solar energy has long attracted widespread attention from the scientific research community and industry due to its clean and renewable advantages.

As early as the late 1970s, U.S. President Carter proposed a solar energy plan, which was the time of the oil crisis.

However, Carter's plan was not officially implemented in the United States because the cost of solar energy was much higher than the benefits it generated.

Later, after entering the 21st century, China officially started its solar energy plan, and now the research on solar cells is considered a hot spot in the world.

In solar energy, perovskite solar cells, as the new favorite in next-generation photovoltaics, have the characteristics of easy preparation, low cost and high efficiency. They have developed rapidly in just a few years, and the current highest certified photoelectric conversion efficiency has reached 22.1%.

However, although the power conversion efficiency of perovskite solar cells has been rapidly developed, it is still impossible to replace silicon due to issues such as its stability and lead toxicity.

[To be honest, I have been using the Huanyuan app recently to read and catch up on new books. It allows me to switch between sources and read aloud with many sounds. .huanyuanapp is available for Android and Apple.]

"... As a potential substitute for traditional lead halide, lead acetate is cheaper, does not require complex anti-solvent methods, and only requires short low-temperature annealing to obtain an ultra-smooth and dense perovskite film.

But so far, perovskite solar cells based on lead acetate precursors are slightly less efficient than other reported planar junction perovskite solar cells based on traditional lead halide precursors.

The purpose of our project is to significantly improve the photoelectric conversion efficiency of trans planar junction perovskite solar cells based on lead acetate precursor..."

Although Zhao Xiancai only had a superficial understanding of university physics, Academician Gong didn't go into too much detail, so Zhao Xiancai could basically understand what he said.

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