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Reversible Structural Swell–Shrink and Recoverable Optical Properties in Hybrid Inorganic–Organic Perovskite
journal contribution
posted on 2016-07-07, 00:00 authored by Yupeng Zhang, Yusheng Wang, Zai-Quan Xu, Jingying Liu, Jingchao Song, Yunzhou Xue, Ziyu Wang, Jialu Zheng, Liangcong Jiang, Changxi Zheng, Fuzhi Huang, Baoquan Sun, Yi-Bing Cheng, Qiaoliang BaoIon migration in hybrid organic–inorganic
perovskites has
been suggested to be an important factor for many unusual behaviors
in perovskite-based optoelectronics, such as current–voltage
hysteresis, low-frequency giant dielectric response, and the switchable
photovoltaic effect. However, the role played by ion migration in
the photoelectric conversion process of perovskites is still unclear.
In this work, we provide microscale insights into the influence of
ion migration on the microstructure, stability, and light–matter
interaction in perovskite micro/nanowires by using spatially resolved
optical characterization techniques. We observed that ion migration,
especially the migration of MA+ ions, will induce a reversible
structural swell–shrink in perovskites and recoverably affect
the reflective index, quantum efficiency, light-harvesting, and photoelectric
properties. The maximum ion migration quantity in perovskites was
as high as approximately 30%, resulting in lattice swell or shrink
of approximately 4.4%. Meanwhile, the evidence shows that ion migration
in perovskites could gradually accelerate the aging of perovskites
because of lattice distortion in the reversible structural swell–shrink
process. Knowledge regarding reversible structural swell–shrink
and recoverable optical properties may shed light on the development
of optoelectronic and converse piezoelectric devices based on perovskites.