Inversion symmetry and bulk Rashba effect in methylammonium lead iodide perovskite single crystals.

ABSTRACT: Methylammonium lead iodide perovskite (MAPbI₃) exhibits long charge carrier lifetimes that are linked to its high efficiency in solar cells. Yet, the mechanisms governing these unusual carrier dynamics are not completely understood. A leading hypothesis-disproved in this work-is that a large, static bulk Rashba effect slows down carrier recombination. Here, using second harmonic generation rotational anisotropy measurements on MAPbI₃ crystals, we demonstrate that the bulk structure of tetragonal MAPbI₃ is centrosymmetric with I4/mcm space group. Our calculations show that a significant Rashba splitting in the bandstructure requires a non-centrosymmetric lead iodide framework, and that incorrect structural relaxations are responsible for the previously predi

SUBMITTER: Frohna K 

PROVIDER: S-EPMC5940805 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature