title: Pressure-Induced Structural Evolution and Band Gap Shifts of Organometal Halide Perovskite-Based Methylammonium Lead Chloride.
abstract: Organometal halide perovskites are promising materials for optoelectronic devices. Further development of these devices requires a deep understanding of their fundamental structure-property relationships. The effect of pressure on the structural evolution and band gap shifts of methylammonium lead chloride (MAPbCl3) was investigated systematically. Synchrotron X-ray diffraction and Raman experiments provided structural information on the shrinkage, tilting distortion, and amorphization of the primitive cubic unit cell. In situ high pressure optical absorption and photoluminescence spectra manifested that the band gap of MAPbCl3could be fine-tuned to the ultraviolet region by pressure. The optical changes are correlated with pressure-induced structural evolution of MAPbCl3, as evidenced by band gap shifts. Comparisons between Pb-hybrid perovskites and inorganic octahedra provided insights on the effects of halogens on pressure-induced transition sequences of these compounds. Our results improve the understanding of the structural and optical properties of organometal halide perovskites.
authors.affiliation: State Key Laboratory of Superhard Materials, Jilin University , Changchun 130012, China.
authors.forename: Lingrui
authors.initials: L
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Superhard Materials, Jilin University , Changchun 130012, China.
authors.forename: Kai
authors.initials: K
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Superhard Materials, Jilin University , Changchun 130012, China.
authors.forename: Guanjun
authors.initials: G
authors.lastname: Xiao
authors.affiliation: Center for High Pressure Science & Technology Advanced Research , Shanghai 201203, China.
authors.forename: Qiaoshi
authors.initials: Q
authors.lastname: Zeng
authors.affiliation: State Key Laboratory of Superhard Materials, Jilin University , Changchun 130012, China.
authors.forename: Bo
authors.identifier: http://orcid.org/0000-0002-3215-1255
authors.initials: B
authors.lastname: Zou