Resonant Raman spectra of CdTe/ZnTe self assembled quantum dots

Abstract

In this paper we present Raman scattering and photoluminescence spectra measured on CdTe/ZnTe self assembled quantum dots. The photoluminescence spectrum has shown two main emission peaks, both connected with existing of quantum dots. One presents direct deexcitation to ground state and the other is optical phonon (ω = 207.3 cm-1)-assisted deexcitation. The registered multiphonon emission process depends on temperature. At low temperature phonon spectra shows line at 450 cm-1 (TA+2LO in ZnTe) and 595 cm-1 (2LO+TO (Γ) in ZnTe).