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New method for preparing large-area long-term stable perovskite cells

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On July 27, the reporter learned from Nanjing University of Aeronautics and Astronautics that Guo Wanlin, an academician of the CAS Member and professor of Nanjing University of Aeronautics and Astronautics, adopted a new perovskite treatment method based on gas phase to prepare a perovskite solar battery with a photoelectric conversion efficiency of more than 18% and an area of more than 200 square centimeters. At the same time, the battery can have a continuous operating life of over 40000 hours, equivalent to an outdoor operating life of over 25 years, breaking the world record. This provides a new strategy for the application of perovskite solar cells. The relevant paper was recently published in the international academic journal Science.

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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