Anharmonic phonon coupling and decay of optical phonons in polycrystalline CdSe thin films

by Muhammad Faisal Iqbal;Kaleem Ullah;Manzar Mushaf Yaqoob;Abbas Ahmad Khan;Sumbal Farid;Peng Zhu;Deliang Wang

Ceramics International 2022, 48(16); https://doi.org/10.1016/j.ceramint.2022.04.351

Abstract

The lifetime of longitudinal optical (LO) phonon is a key parameter that significantly affects the performance of semiconductor optoelectronic devices. Herein, in situ temperature-dependent resonance Raman scattering experiment has been performed to study the phonon anharmonicity in sputter-deposited CdSe thin films. Strong multiphonon scattering processes involving 1LO + TO, 2LO-TO, 2LO + TO, 2LO+E2low and TO-E2low are well resolved and allow us to investigate the anharmonic decay of 1LO, 2LO, and 1LO + TO phonon modes. Fundamental 1LO and its overtone 2LO phonon modes asymmetrically decay into a pair of transverse optical (TO) and transverse acoustical (TA) phonon at the ‘A’ point of the Brillouin zone along Γ−A direction. With increasing temperature, enhanced anharmonic phonon coupling and phonon decay led to an almost linear decrease in the wavenumber of both modes and a nearly linear increase in their full-width half maxima. The composite 1LO + TO mode exhibited a ~30% faster decay rate compared to the decay rate of the fundamental 1LO phonon mode.

Keywords: Anharmonic phonon couplingFDTD simulationsSurface-enhanced Raman scatteringThin filmsCdSe