Unraveling the Impact of Halide Mixing on Perovskite Stability.

ABSTRACT: Increasing the stability of perovskites is essential for their integration in commercial photovoltaic devices. Halide mixing is suggested as a powerful strategy toward stable perovskite materials. However, the stabilizing effect of the halides critically depends on their distribution in the mixed compound, a topic that is currently under intense debate. Here we successfully determine the exact location of the I and Cl anions in the  CH₃NH₃PbBr_{3- y}I _y and CH₃NH₃PbBr_{3- z}Cl _z mixed halide perovskite lattices and correlate it with the enhanced stability we find for the latter. By combining scanning tunneling microscopy and density functional theory, we predict that, for low ratios, iodine and chlorine incor

SUBMITTER: Hieulle J 

PROVIDER: S-EPMC7156144 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature