Intrinsic anion diffusivity in lead halide perovskites is facilitated by a soft lattice.

ABSTRACT: Facile ionic transport in lead halide perovskites plays a critical role in device performance. Understanding the microscopic origins of high ionic conductivities has been complicated by indirect measurements and sample microstructural heterogeneities. Here, we report the direct visualization of halide anion interdiffusion in CsPbCl₃-CsPbBr₃ single crystalline perovskite nanowire heterojunctions using wide-field and confocal photoluminescence measurements. The combination of nanoscale imaging techniques with these single crystalline materials allows us to measure intrinsic anionic lattice diffusivities, free from complications of microscale inhomogeneity. Halide diffusivities were found to be between 10^-13 and ∼10^-12 cm²/second at about

SUBMITTER: Lai M 

PROVIDER: S-EPMC6255190 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature