Accurate determination of the exciton binding energy and reduced effective mass in bulk halide perovskites is of utmost importance for the selective design of optoelectronic devices. Although these properties are currently determined by several spectroscopic techniques, complementary theoretical models are often required to bridge macroscopic and microscopic properties. Here, we present a method to determine these quantities while considering polarization effects due to carrier interactions with longitudinal optical phonons. Our approach estimates the exciton-polaron binding energy from optical absorption measurements using a recently developed Elliott-based band fluctuations (EBF) model. The reduced effective mass is obtained via the integration of this well-established EBF model with the Pollmann–Büttner exciton-polaron model, which is based on the Fröhlich polaron framework, where the strength of the electron …
Autor(es):Lizarraga, K. and Guerra, J. A. and Enrique-Moran, L. A. and Serquen, E. and Ventura, E. and Villegas, Cesar E. P. and Rocha, A. R. and Venezuela, P.
Año: 2025
Título de la revista: Physical Review Materials
Volumen: 9
Url: https://doi.org/10.1103/3sxd-26yj