The internal structure of polymer materials affects the efficiency of solar cells

According to the report of the American Science Promotion Association (AAAS) technology news sharing platform EurekAlert! Can be greatly improved. This latest study was published in the Journal of Materials Chemistry A.

Solar panels and accumulators are the two most promising methods of power generation. As of 2017, the total power generated by solar panels installed worldwide reached 400 gigawatts. The rapid development of the solar energy industry is mainly dependent on the continuous reduction of battery prices and the continuous improvement of its efficiency.

The introduction of new materials is a way to improve solar systems. In solar panels, the basic elements needed to convert light energy into electrical energy are photovoltaic cells or solar cells, which are mainly composed of polycrystalline silicon, which is a high-purity polycrystalline form of silicon. It is understood that scientists are currently busy looking for alternative materials for polysilicon, and organic polymer materials with photovoltaic properties are one of the main candidates.

The researchers said that adding fluorine atoms to the polymer can effectively improve the efficiency of solar cells. This method is called a fluorination reaction and has been proven to enhance the photovoltaic performance of polymers, but the principle is rarely known. The new study clarifies the positive effect of the fluorination reaction on the efficiency of the battery by changing the internal structure of the material.

After many experiments, the research team selected organic polymer materials with better photovoltaic characteristics and further studied their microstructures. After X-ray analysis, it was found that the internal structure of this polymer is more ordered. At the same time, the charge carriers of its molecules have better fluidity, so that the material can conduct electricity better. For solar cells, this is undoubtedly a huge advantage.

One of the researchers, the head of the Functional Organic Composites Laboratory of the Moscow Institute of Physics and Technology, and the director of the French National Science Research Center, Professor Dimitri Ivanov, said: "The challenge of this research is to select molecules that can improve battery efficiency Energy levels and the development of supramolecular structures that enable the transfer of charge to the electrode. "(Guo Zishuo, an intern)

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