Halide Mixing Inhibits Exciton Transport in Two-dimensional Perovskites Despite Phase Purity.

ABSTRACT: Halide mixing is one of the most powerful techniques to tune the optical bandgap of metal-halide perovskites. However, halide mixing has commonly been observed to result in phase segregation, which reduces excited-state transport and limits device performance. While the current emphasis lies on the development of strategies to prevent phase segregation, it remains unclear how halide mixing may affect excited-state transport even if phase purity is maintained. Here, we study exciton transport in phase pure mixed-halide 2D perovskites of (PEA)₂Pb(I_1-x Br _x )₄. Using transient photoluminescence microscopy, we show that, despite phase purity, halide mixing inhibits exciton transport. We find a significant reduction even for relatively l

SUBMITTER: Seitz M 

PROVIDER: S-EPMC8762701 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature