Atomically Precise Ruddlesden-Popper Faults Induced Enhanced Emission in Ligand Stabilized Mixed Halide Perovskites.

ABSTRACT: Atomic-resolution imaging of Ruddlesden-Popper (RP) interfaces is challenging due to their concealment within perovskite nanocrystals (NCs) and the inherent limitations of conventional characterization techniques. In this study, distinctly oriented RP faults have been detected using double-Cs-corrected high-angle annular dark-field scanning transmission electron microscopy (STEM). A simple yet reliable STEM approach to achieve atomically precise identification of Pb, Cs, Br, and I atoms and analyze their spatial atomic arrangements in a single NC is employed. In addition, dislocations caused by lattice mismatch at grain boundaries (GBs) are identified. Lattice strain in GBs and RPs is determined and quantified, revealing that neither of these planar defects introduces the deep trap levels.

SUBMITTER: Mahato S 

PROVIDER: S-EPMC12574628 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature