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

Pengjie Hang; Jiangsheng Xie; Ge Li; Ying Wang; Desheng Fang; Yuxin Yao; Danyan Xie; Can Cui; Keyou Yan; Jianbin Xu; Deren Yang; Xuegong Yu

doi:10.1016/j.isci.2019.10.021

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

iScience. 2019 Nov 22:21:217-227. doi: 10.1016/j.isci.2019.10.021. Epub 2019 Oct 12.

Authors

Pengjie Hang¹, Jiangsheng Xie², Ge Li¹, Ying Wang¹, Desheng Fang³, Yuxin Yao³, Danyan Xie³, Can Cui³, Keyou Yan⁴, Jianbin Xu⁴, Deren Yang¹, Xuegong Yu⁵

Affiliations

¹ State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.
² State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China; Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong 999077, China. Electronic address: jiangsheng.xie@zju.edu.cn.
³ Center for Optoelectronics Materials and Devices, Department of Physics, Zhejiang Sci-Tech University, Hangzhou 310018, China.
⁴ Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong 999077, China.
⁵ State Key Laboratory of Silicon Materials and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China. Electronic address: yuxuegong@zju.edu.cn.

Abstract

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.

Keywords: Catalysis; Energy Materials; Energy Storage.