An Interlayer with Strong Pb-Cl Bond Delivers Ultraviolet-Filter-Free, Efficient, and Photostable Perovskite Solar Cells

• Main Authors: Pengjie Hang, Jiangsheng Xie, Ge Li, Ying Wang, Desheng Fang, Yuxin Yao, Danyan Xie, Can Cui, Keyou Yan, Jianbin Xu, Deren Yang, Xuegong Yu
• Format: Article
• Language: English
• Published: Elsevier 2019-11-01
• Series: iScience
• Online Access: http://www.sciencedirect.com/science/article/pii/S2589004219304006

Summary: The inorganic metal oxides (IMOs), including titanium dioxide (TiO2) and tin dioxide (SnO2), inevitably induce decomposition of perovskite under UV illumination owing to their photocatalytic activity, and the use of a UV filter will add extra cost and reduce the effective power output. Here, we first reveal that the weak Pb-I bond in I-based perovskite is prone to breakage under UV photocatalysis, leading to serious degradation of the SnO2/perovskite interface. We introduced a chlorine-rich mixed-halide perovskite interlayer (ClMPI), which possesses an excellent tolerance to photocatalysis owing to the strong Pb-Cl bond, between the SnO2 and I-based perovskite. The ClMPI-based device achieves an enhanced efficiency of up to 21.01% (certified 20.17%). Most importantly, the resultant devices can maintain >94% of their initial performance after 180 h under outdoor solar irradiation, >80% after 500 h under UV irradiation, and 500 h under continuous full spectrum illumination at their maximum power points. : Catalysis; Energy Storage; Energy Materials Subject Areas: Catalysis, Energy Storage, Energy Materials