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Highly Efficient Perovskite Solar Cells via Nickel Passivation
Author(s) -
Gong Xiu,
Guan Li,
Pan Haiping,
Sun Qiang,
Zhao Xiaojuan,
Li Hao,
Pan Han,
Shen Yan,
Shao Yong,
Sun Lijie,
Cui Zhifang,
Ding Liming,
Wang Mingkui
Publication year - 2018
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.201804286
Subject(s) - passivation , materials science , crystallinity , perovskite (structure) , energy conversion efficiency , crystallite , halide , chemical engineering , grain size , carrier lifetime , thin film , optoelectronics , nanotechnology , inorganic chemistry , metallurgy , silicon , composite material , layer (electronics) , engineering , chemistry
Today's state‐of‐the‐art perovskite solar cells (PSCs) are utilizing polycrystalline perovskite thin films via solution‐processing at low temperature (<150 °C). It is extremely significant to enlarge grain size and passivate trap states for perovskite thin films to achieve high power conversion efficiency. Herein, a strategy for defect passivation of perovskite films via metal ion Ni 2+ is for the first time reported. It is found that addition of Ni 2+ can significantly generate polyporous PbI 2 films due to a different solubility between NiCl 2 and PbI 2 which benefits penetration of MAI and thus formation of large grain perovskite films eventually. It further demonstrated that Ni 2+ ions can effectively passivate PbI 3 − antisite defects and restrain the generation of Pb 0 by interacting with the under‐coordinated halide anions and halide‐rich antisites. Therefore, introducing moderate Ni 2+ ions result in a significant increase in photoluminescence lifetime from 285 to 732 ns. Accordingly, a power conversion efficiency of 20.61% can be achieved for the 3% Ni 2+ addition‐based PSCs with an enhanced cell stability under ambient conditions. This work provides a promising route toward perovskite films featuring with high crystallinity and low trap‐density.