Optically Determined Hole Effective Mass in Tin-Iodide Perovskite Films.

ABSTRACT: Tin-halide perovskites currently offer the best photovoltaic performance of lead-free metal-halide semiconductors. However, their transport properties are mostly dominated by holes, owing to ubiquitous self-doping. Here we demonstrate a noncontact, optical spectroscopic method to determine the effective mass of the dominant hole species in FASnI₃, by investigating a series of thin films with hole densities finely tuned through either SnF₂ additive concentration or controlled exposure to air. We accurately determine the plasma frequency from mid-infrared reflectance spectra by modeling changes in the vibrational response of the FA cation as the plasma edge shifts through the molecular resonance. Our approach yields a hole effective mass of 0.28m _e

SUBMITTER: Lim VJ 

PROVIDER: S-EPMC12442082 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature