New method for preparing large-area long-term stable perovskite cells
2024/7/29
The new method breaks through the limitations of traditional liquid-phase methods that are difficult to uniformly prepare large-area perovskite cell devices, significantly improving the efficiency and stability of perovskite cells. The first author of the paper, Professor Zhao Xiaoming from Nanjing University of Aeronautics and Astronautics, explained, "Although the liquid-phase perovskite cell processing method can significantly improve the efficiency and stability of small area battery devices, the uneven reaction rate between passivators and perovskite films in the preparation of large-area perovskite solar cells results in poor film passivation effect
How to obtain large-area and long-term stable perovskite solar cells while maintaining high photoelectric conversion efficiency has become a major technical challenge. In this study, Guo Wanlin's team innovatively adopted a new gas-phase treatment method - gas-phase fluorine vapor treatment method.
Gas phase fluorination treatment allows hydrogen fluoride to be evenly distributed in the air, react with perovskite films, form stable chemical bonds, suppress the formation of film defects, and anchor anions near the film surface. Guo Wanlin introduced that compared with traditional liquid-phase treatment methods, fluorine vapor treatment makes perovskite films more uniformly passivated, thereby exhibiting a long photoluminescence lifetime over a large area and significantly reducing defect sources that induce material degradation.
Guo Wanlin stated that this research has laid the foundation for the preparation of solar modules and devices that meet commercial requirements, accelerating the process of perovskite solar cells from basic research to commercial applications.
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