Electron-phonon coupling in CsPbBr3

Abstract

The interaction between electrons and phonons in CsPbBr3 is essential for the design of CsPbBr3 based optoelectronics since the phonon governs emission line broadening in metal halide perovskites. In this work, the temperature dependent photoluminescence linewidth was obtained from 80 K to 400 K. Density functional theory and many-body perturbation theory were used to calculate the electron-phonon coupling in CsPbBr3. We demonstrate that the electron-phonon coupling is dominated by the longitudinal optical phonon. In addition, the photoluminescence spectrum broadening is almost linear with temperatures from 80 K to 400 K. Their results provide a better understanding of the mechanism of electron-phonon scattering in CsPbBr3 and related optoelectronic devices.