Mechanism of Hot-Carrier Photoluminescence in Sn-Based Perovskites.

ABSTRACT: Metal halide perovskites have shown exceptionally slow hot-carrier cooling, which has been attributed to various physical mechanisms without reaching a consensus. Here, experiment and theory are combined to unveil the carrier cooling process in formamidinium (FA) and caesium (Cs) tin triiodide thin films. Through impulsive vibrational spectroscopy and molecular dynamics, much shorter phonon dephasing times of the hybrid perovskite, which accounts for the larger blueshift in the photoluminescence seen at high excitation density for FASnI₃ compared to CsSnI₃ is reported. Density functional theory investigations reveal that the largest contribution to the blueshift is accounted by a giant, dynamic band-filling effect in Sn-based perovskites, which in turn can explain the

SUBMITTER: Tekelenburg EK 

PROVIDER: S-EPMC11795716 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature