Large lattice distortions and size-dependent bandgap modulation in epitaxial halide perovskite nanowires.

ABSTRACT: Metal-halide perovskites have been shown to be remarkable and promising optoelectronic materials. However, despite ongoing research from multiple perspectives, some fundamental questions regarding their optoelectronic properties remain controversial. One reason is the high-variance of data collected from, often unstable, polycrystalline thin films. Here we use ordered arrays of stable, single-crystal cesium lead bromide (CsPbBr₃) nanowires grown by surface-guided chemical vapor deposition to study fundamental properties of these semiconductors in a one-dimensional model system. Specifically, we uncover the origin of an unusually large size-dependent luminescence emission spectral blue-shift. Using multiple spatially resolved spectroscopy techniques, we establish that bandgap mod

SUBMITTER: Oksenberg E 

PROVIDER: S-EPMC6981217 | biostudies-literature | 2020 Jan

REPOSITORIES: biostudies-literature