Benign ferroelastic twin boundaries in halide perovskites for charge carrier transport and recombination.

ABSTRACT: Grain boundaries have been established to impact charge transport, recombination and thus the power conversion efficiency of metal halide perovskite thin film solar cells. As a special category of grain boundaries, ferroelastic twin boundaries have been recently discovered to exist in both CH₃NH₃PbI₃ thin films and single crystals. However, their impact on the carrier transport and recombination in perovskites remains unexplored. Here, using the scanning photocurrent microscopy, we find that twin boundaries have negligible influence on the carrier transport across them. Photoluminescence (PL) imaging and the spatial-resolved PL intensity and lifetime scanning confirm the electronically benign nature of the twin boundaries, in striking contrast to regular gr

SUBMITTER: Xiao X 

PROVIDER: S-EPMC7200693 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature