title: Giant photostriction in organic-inorganic lead halide perovskites.
abstract: Among the many materials investigated for next-generation photovoltaic cells, organic-inorganic lead halide perovskites have demonstrated great potential thanks to their high power conversion efficiency and solution processability. Within a short period of about 5 years, the efficiency of solar cells based on these materials has increased dramatically from 3.8 to over 20%. Despite the tremendous progress in device performance, much less is known about the underlying photophysics involving charge-orbital-lattice interactions and the role of the organic molecules in this hybrid material remains poorly understood. Here, we report a giant photostrictive response, that is, light-induced lattice change, of >1,200 p.p.m. in methylammonium lead iodide, which could be the key to understand its superior optical properties. The strong photon-lattice coupling also opens up the possibility of employing these materials in wireless opto-mechanical devices.
authors.affiliation: School of Materials Science and Engineering, Nanyang Technological University, Block N4.1-02-24, 50 Nanyang Avenue, Singapore 639798, Singapore.
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: School of Materials Science and Engineering, Nanyang Technological University, Block N4.1-02-24, 50 Nanyang Avenue, Singapore 639798, Singapore.
authors.forename: Lu
authors.identifier: http://orcid.org/0000-0003-3058-2884
authors.initials: L
authors.lastname: You
authors.affiliation: School of Materials Science and Engineering, Nanyang Technological University, Block N4.1-02-24, 50 Nanyang Avenue, Singapore 639798, Singapore.
authors.forename: Shiwei
authors.initials: S
authors.lastname: Wang
authors.affiliation: School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 639798, Singapore.
authors.forename: Zhiliang
authors.initials: Z
authors.lastname: Ku
authors.affiliation: School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 639798, Singapore.
authors.forename: Hongjin
authors.initials: H
authors.lastname: Fan
authors.affiliation: Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore 117603, Singapore.
authors.forename: Daniel
authors.initials: D
authors.lastname: Schmidt
authors.affiliation: Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore 117603, Singapore.
authors.forename: Andrivo
authors.initials: A
authors.lastname: Rusydi
authors.affiliation: School of Materials Science and Engineering, Nanyang Technological University, Block N4.1-02-24, 50 Nanyang Avenue, Singapore 639798, Singapore.
authors.forename: Lei
authors.initials: L
authors.lastname: Chang
authors.affiliation: School of Materials Science and Engineering, Nanyang Technological University, Block N4.1-02-24, 50 Nanyang Avenue, Singapore 639798, Singapore.
authors.forename: Le
authors.initials: L
authors.lastname: Wang
authors.affiliation: School of Materials Science and Engineering, Nanyang Technological University, Block N4.1-02-24, 50 Nanyang Avenue, Singapore 639798, Singapore.
authors.forename: Peng
authors.initials: P
authors.lastname: Ren
authors.affiliation: Department of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
authors.forename: Liufang
authors.initials: L
authors.lastname: Chen
authors.affiliation: Department of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
authors.forename: Guoliang
authors.initials: G
authors.lastname: Yuan
authors.affiliation: Department of Physics, South University of Science and Technology of China, Shenzhen 518055, China.
authors.forename: Lang
authors.initials: L
authors.lastname: Chen
authors.affiliation: School of Materials Science and Engineering, Nanyang Technological University, Block N4.1-02-24, 50 Nanyang Avenue, Singapore 639798, Singapore.
authors.forename: Junling
authors.identifier: http://orcid.org/0000-0003-3663-7081
authors.initials: J
authors.lastname: Wang