Nanoscale-Resolved Surface-to-Bulk Electron Transport in CsPbBr₃ Perovskite.

ABSTRACT: Describing the nanoscale charge carrier transport at surfaces and interfaces is fundamental for designing high-performance optoelectronic devices. To achieve this, we employ time- and angle-resolved photoelectron spectroscopy with ultraviolet pump and extreme ultraviolet probe pulses. The resulting high surface sensitivity reveals an ultrafast carrier population decay associated with surface-to-bulk transport, which was tracked with a sub-nanometer spatial resolution normal to the surface, and on a femtosecond time scale, in the case of the inorganic CsPbBr₃ lead halide perovskite. The decay time exhibits a pronounced carrier density dependence, which is attributed via modeling to enhanced diffusive transport and concurrent recombination. The transport is found to approach an or

SUBMITTER: Polishchuk S 

PROVIDER: S-EPMC8832496 | biostudies-literature | 2022 Feb

REPOSITORIES: biostudies-literature