2018/11/05 by Jacob N. Wilson, Jarvist M. Frost, Wilson, Jacob N. +5
Engineering · #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Perovskite Materials and Applications
paper · pdf · doi:10.48550/arxiv.1811.01832
openalex publication_date 2018/11/05 · openalex created_date 2022/08/02 · openalex updated_date 2026/07/28
Halide perovskite semiconductors respond to electric fields in a way that\nvaries across time and length scales. We discuss the microscopic processes that\ngive rise to the macroscopic polarization of these materials, ranging from the\noptical and vibrational response to the transport of ions and electrons. The\nstrong frequency dependence of the dielectric permittivity can be understood by\nseparating the static dielectric constant into its constituents, including the\norientional polarization due to rotating dipoles, which connects theory with\nexperimental observations. The controversial issue of ferroelectricity is\naddressed, where we highlight recent progress in materials and domain\ncharacterization, but emphasize the challenge associated with isolating\nspontaneous lattice polarization from other processes such as charged defect\nformation and transport. We conclude that CH3NH3PbI3 exhibits many\nfeatures characteristic of a ferroelastic electret, where a spontaneous lattice\nstrain is coupled to long-lived metastable polarization states.\n