Well width dependence of electron-phonon interaction in ZnSe/ZnS xSe 1- x superlattices determined by micro-raman spectroscopy

Abstract

We report a study of multiphonon resonant Raman scattering in a series of symmetric (ZnSe) d (ZnS 1- x Se x ) d superlattices (SL), 20Å ≤ d ≤ 150Å. In addition to confined optical phonons, the energies of interface (IF) modes with in-plane wavevectors have been assessed by means of micro-probe Raman measurements in backscattering from the SL edge. The comparison between one- and two-phonon spectra shows that the electron-phonon interaction is dominated by ZnSe-like IF phonons for d < 50Å, whereas LO 2 phonons prevail for larger well.