Dynamic emission Stokes shift and liquid-like dielectric solvation of band edge carriers in lead-halide perovskites.

ABSTRACT: Lead-halide perovskites have emerged as promising materials for photovoltaic and optoelectronic applications. Their significantly anharmonic lattice motion, in contrast to conventional harmonic semiconductors, presents a conceptual challenge in understanding the genesis of their exceptional optoelectronic properties. Here we report a strongly temperature dependent luminescence Stokes shift in the electronic spectra of both hybrid and inorganic lead-bromide perovskite single crystals. This behavior stands in stark contrast to that exhibited by more conventional crystalline semiconductors. We correlate the electronic spectra with the anti-Stokes and Stokes Raman vibrational spectra. Dielectric solvation theories, originally developed for excited molecules dissolved in polar liquids, reproduc

SUBMITTER: Guo Y 

PROVIDER: S-EPMC6414684 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature