Optical spectroscopy of two-dimensional layered $(C_{6}H_{5}C_{2}H_{4}-NH_{3})_{2}-PbI_{4}$ perovskite

TL;DR

This study investigates the optical properties of a two-dimensional hybrid perovskite, revealing strong exciton-phonon interactions and suggesting a polaron-based interpretation of photoluminescence features.

Contribution

It provides new insights into excitonic and phononic behaviors in 2D perovskites through detailed optical spectroscopy analysis.

Findings

Exciton-phonon interaction is over ten times stronger than in GaAs quantum wells.

Photoluminescence lines are best explained by a polaron model.

Temperature and excitation power influence the optical spectra significantly.

Abstract

We report on optical spectroscopy (photoluminescence and photoluminescence excitation) on two-dimensional self-organized layers of $(C_{6}H_{5}C_{2}H_{4}-NH_{3})_{2}PbI_{4}$ perovskite. Temperature and excitation power dependance of the optical spectra gives a new insight into the excitonic and phononic properties of this hybrid organic/inorganic semiconductor. In particular, exciton-phonon interaction is found to be more than one order of magnitude higher than in GaAs QWs. As a result, photoluminescence emission lines have to be interpreted in the framework of a polaron model.