title: Reversible Structural Swell-Shrink and Recoverable Optical Properties in Hybrid Inorganic-Organic Perovskite.
abstract: Ion 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.
authors.affiliation: Department of Materials Science and Engineering, Monash University , Wellington Road, Clayton, Victoria 3800, Australia.
authors.forename: Yupeng
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University , Suzhou 215123, People's Republic of China.
authors.forename: Yusheng
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Materials Science and Engineering, Monash University , Wellington Road, Clayton, Victoria 3800, Australia.
authors.forename: Zai-Quan
authors.initials: ZQ
authors.lastname: Xu
authors.affiliation: Department of Materials Science and Engineering, Monash University , Wellington Road, Clayton, Victoria 3800, Australia.
authors.forename: Jingying
authors.initials: J
authors.lastname: Liu
authors.affiliation: Department of Materials Science and Engineering, Monash University , Wellington Road, Clayton, Victoria 3800, Australia.
authors.forename: Jingchao
authors.initials: J
authors.lastname: Song
authors.affiliation: Department of Materials Science and Engineering, Monash University , Wellington Road, Clayton, Victoria 3800, Australia.|Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University , Suzhou 215123, People's Republic of China.
authors.forename: Yunzhou
authors.initials: Y
authors.lastname: Xue
authors.affiliation: Department of Materials Science and Engineering, Monash University , Wellington Road, Clayton, Victoria 3800, Australia.
authors.forename: Ziyu
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Department of Materials Science and Engineering, Monash University , Wellington Road, Clayton, Victoria 3800, Australia.
authors.forename: Jialu
authors.initials: J
authors.lastname: Zheng
authors.affiliation: Department of Materials Science and Engineering, Monash University , Wellington Road, Clayton, Victoria 3800, Australia.
authors.forename: Liangcong
authors.initials: L
authors.lastname: Jiang
authors.affiliation: Department of Civil Engineering, Monash University , Clayton, 3800 Victoria, Australia.
authors.forename: Changxi
authors.initials: C
authors.lastname: Zheng
authors.affiliation: Department of Materials Science and Engineering, Monash University , Wellington Road, Clayton, Victoria 3800, Australia.
authors.forename: Fuzhi
authors.initials: F
authors.lastname: Huang
authors.affiliation: Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University , Suzhou 215123, People's Republic of China.
authors.forename: Baoquan
authors.initials: B
authors.lastname: Sun
authors.affiliation: Department of Materials Science and Engineering, Monash University , Wellington Road, Clayton, Victoria 3800, Australia.
authors.forename: Yi-Bing
authors.initials: YB
authors.lastname: Cheng
authors.affiliation: Department of Materials Science and Engineering, Monash University , Wellington Road, Clayton, Victoria 3800, Australia.|Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University , Suzhou 215123, People's Republic of China.
authors.forename: Qiaoliang
authors.initials: Q
authors.lastname: Bao
keywords: hybrid organic−inorganic perovskite; lattice distortion; one-dimensional material; optical properties; structural properties