In-situ boundary bridging unlocks multi-grain-domain carrier diffusion in polycrystalline metal halide perovskites.

ABSTRACT: Charge transport and extraction in polycrystalline perovskite films are often hindered by inefficient carrier transfer across grain domain boundaries (GDBs). Herein, we present a universal post-treatment strategy leveraging supramolecular crown ether-assisted slow release and precise delivery of Rb⁺ cations to GDBs, achieving in-situ GDB bridging. The solid-state nuclear magnetic resonance (NMR), transmission electron microscopic (TEM), and time-of-flight secondary ion mass spectrometry (ToF-SIMS) analyses confirm that Rb⁺ forms a non-perovskite phase, primarily localized at the surface and GDBs. Ultrafast time-resolved photoluminescence mapping revealed accelerated carrier diffusion across the grain boundaries for the Rb⁺-treated perovskite thin films which enables p

SUBMITTER: Wang M 

PROVIDER: S-EPMC12488885 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature