Performance-limiting metastable intragrain impurity nanoclusters in metal halide perovskites.

ABSTRACT: Impurity control in metal halide perovskite thin films is crucial for advancing the efficiency and long-term stability of perovskite solar cells. While previous efforts have mainly addressed impurities at grain boundaries and heterointerfaces, efforts have rarely been made to reveal and modulate (sub-)nanoscale impurities within grains. In this work, using low-dose scanning transmission electron microscopy, we observed the nontrivial existence of intragrain impurity nanoclusters, identifying a previously unknown, metastable orthorhombic non-perovskite phase with a parallel chain-like structure, in nominally processed Cs-incorporated mixed-cation perovskite films. First-principles calculations and quasi-in situ observations reveal that these intragrain nanoclusters adversely affect the opto

SUBMITTER: Wang W 

PROVIDER: S-EPMC12774909 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature