According to local media reports in Japan, for the new generation of solar cell "perovskite solar cell" materials, researchers at the University of Tokyo Science and Technology Center for Advanced Research realized a high conversion efficiency of 20.5% without using rare metals such as antimony. And stable power generation. The study of the stability of crystalline structures was accomplished by adding more potassium to the earth. While conducting long-term durability tests, the research team also evaluated and studied the practical application of Panasonic and Toshiba companies.
The so-called perovskite solar cell is a solar cell using a material having a perovskite crystal structure. Compared with the current mainstream silicon solar cells, the manufacturing process is simple and the manufacturing cost is low. At present, practical solar cells with a reference conversion efficiency of more than 20% use rare metals such as tantalum and niobium to maintain structural stability.
The research team of the University of Tokyo maintained the crystal structure by adding potassium under certain conditions, successfully produced a defect-free regular electricity generation layer without using any rare metal, and improved the conversion efficiency because it did not hinder the flow of electrons. Power stability.
In addition, the research team also confirmed that the use of potassium to change the current and voltage can suppress the "hysteresis" of the change in the amount of power generated. The use of metal such as antimony has a higher inhibitory effect and can achieve more stable power generation. It is difficult to measure the correct conversion efficiency due to hysteresis in solar cells, which was a practical issue.
The University of Tokyo’s research is part of the NEDO project. The project aims to achieve a conversion efficiency of 25% by 2020 and an efficiency of over 95% after 10,000 hours of exposure. Therefore, considering the practicality and popularity of the future, it is of great significance to use readily available materials. (Ministry of Technology)
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