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Revealing Dynamic Effects of Mobile Ions in Halide Perovskite Solar Cells Using Time‐Resolved Microspectroscopy
Author(s) -
Chen Weijian,
Gan Zhixing,
Green Martin A.,
Jia Baohua,
Wen Xiaoming
Publication year - 2021
Publication title -
small methods
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.66
H-Index - 46
ISSN - 2366-9608
DOI - 10.1002/smtd.202000731
Subject(s) - perovskite (structure) , ionic bonding , materials science , crystallite , halide , context (archaeology) , luminescence , ion , nanoscopic scale , nanotechnology , chemical physics , optoelectronics , chemistry , inorganic chemistry , crystallography , biology , paleontology , organic chemistry , metallurgy
Halide perovskites are promising candidate materials for the next generation high‐efficiency optoelectronic devices. Since perovskites are electronic‐ionic mixed conductors, ion dynamics have a critical impact on the performance and stability of perovskite‐based applications. However, comprehensively understanding ionic dynamics is challenging, particularly on nanoscale imaging of ionic dynamics in perovskites. In this review, mobile ion dynamics in halide perovskites investigated via luminescence spectroscopy combined with confocal microscopy are discussed, including mobile ion induced fluorescence quenching, phase segregation in mixed halide hybrid perovskite, and mobile ion accumulation at the interface in perovskite devices. Steady‐state and time‐resolved luminescence imaging techniques, combined with confocal microscopy, are unique tools for probing ionic dynamics in perovskites, providing invaluable insights on ionic dynamics in nanoscale resolution, along with a wide temporal range from picoseconds to hours. The works in this review are not only for understanding mobile ions to improve the design of perovskite‐based devices but also foster the development of microspectroscopic methodologies in a broader solid‐state physics context of investigating ionic transports in polycrystalline materials.