Persistent enhancement of exciton diffusivity in CsPbBr₃ nanocrystal solids.

ABSTRACT: In semiconductors, exciton or charge carrier diffusivity is typically described as an inherent material property. Here, we show that the transport of excitons among CsPbBr₃ perovskite nanocrystals (NCs) depends markedly on how recently those NCs were occupied by a previous exciton. Using transient photoluminescence microscopy, we observe a striking dependence of the apparent exciton diffusivity on excitation laser power that does not arise from nonlinear exciton-exciton interactions or thermal heating. We interpret our observations with a model in which excitons cause NCs to transition to a long-lived metastable configuration that markedly increases exciton transport. The exciton diffusivity observed here (>0.15 square centimeters per second) is considerably higher than that obs

SUBMITTER: Shcherbakov-Wu W 

PROVIDER: S-EPMC10881049 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature