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Improving Performance and Stability of Planar Perovskite Solar Cells through Grain Boundary Passivation with Block Copolymers
Author(s) -
Wang Changlei,
Song Zhaoning,
Zhao Dewei,
Awni Rasha A.,
Li Chongwen,
Shrestha Niraj,
Chen Cong,
Yin Xinxing,
Li Dengbing,
Ellingson Randy J.,
Zhao Xingzhong,
Li Xiaofeng,
Yan Yanfa
Publication year - 2019
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.201900078
Subject(s) - passivation , materials science , grain boundary , chemical engineering , energy conversion efficiency , perovskite (structure) , perovskite solar cell , annealing (glass) , nanotechnology , optoelectronics , composite material , microstructure , layer (electronics) , engineering
Organic–inorganic metal halide perovskite solar cells (PSCs) exhibit excellent photovoltaic performance but have the drawbacks of instabilities against moisture and heat due to the inherent hydroscopic nature and volatility of their organic components. Herein, it is reported that using the block copolymer F127 as the passivation reagent in conjunction with the solvent annealing process can efficiently improve the performance and stability of corresponding organic–inorganic PSCs. It is anticipated that the hydrophilic poly(ethylene oxide) tails of F127 polymers connect with contiguous perovskite crystals and passivate defects at perovskite grain boundaries, whereas the dangling hydrophobic poly(phenyl oxide) centers suppress perovskite decomposition caused by moisture and heat. After the optimization of the F127 additive, planar PSCs with champion power conversion efficiencies of 21.01% and 18.71% are achieved on rigid and flexible substrates, respectively. The F127 passivation strategy provides an effective approach for fabricating high‐efficiency and stable PSCs.