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Fullerene Polymer Complex Inducing Dipole Electric Field for Stable Perovskite Solar Cells
Author(s) -
Wu Congcong,
Wang Kai,
Yan Yongke,
Yang Dong,
Jiang Yuanyuan,
Chi Bo,
Liu Jianzhao,
Esker Alan R.,
Rowe Jennifer,
Morris Amanda J.,
Sanghadasa Mohan,
Priya Shashank
Publication year - 2019
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201804419
Subject(s) - materials science , perovskite (structure) , fullerene , photoactive layer , energy conversion efficiency , photovoltaics , photovoltaic system , optoelectronics , nanotechnology , chemical engineering , polymer solar cell , organic chemistry , ecology , chemistry , engineering , biology
Lead halide perovskite solar cells (PSCs) have demonstrated great potential for realizing low‐cost and easily fabricated photovoltaics. At this juncture, power conversion efficiency and long‐term stability are two important factors limiting their transition. PSCs exhibit rapid environmental degradation since the perovskite layer is very sensitive to factors such as humidity, temperature, and ultraviolet light. Here, a novel successful approach is demonstrated that simultaneously improves the efficiency and stability of PSCs. This approach relies on incorporation of a dual‐functional polymethyl methacrylate (PMMA)–fullerene complex into the perovskite layer. The fullerene within perovskite layer forms a localized dipole‐like electric field that favors electron–hole separation, resulting in significant improvement in current density and fill factor with conversion efficiency reaching 18.4%. The molecular‐scale coating of hydrophobic PMMA on the perovskite grain boundary effectively blocks moisture penetration into the perovskite, thereby, significantly improving the stability against moisture, heat, and light. The PSCs with PMMA–fullerene complex showed no photovoltaic performance degradation for 250 d and exhibited 60 times higher stability compared to the state‐of‐the‐art devices under continuous 1 sun illumination in ambient air.