Hot carrier cooling mechanisms in halide perovskites.

ABSTRACT: Halide perovskites exhibit unique slow hot-carrier cooling properties capable of unlocking disruptive perovskite photon-electron conversion technologies (e.g., high-efficiency hot-carrier photovoltaics, photo-catalysis, and photodetectors). Presently, the origins and mechanisms of this retardation remain highly contentious (e.g., large polarons, hot-phonon bottleneck, acoustical-optical phonon upconversion etc.). Here, we investigate the fluence-dependent hot-carrier dynamics in methylammonium lead triiodide using transient absorption spectroscopy, and correlate with theoretical modeling and first-principles calculations. At moderate carrier concentrations (around 10¹⁸ cm^-3), carrier cooling is mediated by polar Fröhlich electron-phonon interactions through zone-cente

SUBMITTER: Fu J 

PROVIDER: S-EPMC5670184 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature