Raman spectra of CdTe/ZnTe self-assembled quantum dots
In this paper, we present Raman scattered spectra and results of photoluminescence (PL) measurements of CdTe/ZnTe self-assembled quantum dots (SAQD). The PL spectrum displayed two main emission peaks, both connected with the existing of QDs. One presents direct deexcitation to ground state and the other is optical phonon (?=204.2cm?1)-assisted deexcitation. The registered multiphonon (MP) emission process depends on temperature. At low temperature, one-phonon spectra shows line at 200.4 and 210.3cm?1 (ZnTe LO mode confined by degenerate superlattices), 217cm?1 (TA+LO in ZnTe) and 386cm?1 (LO+TO(?) in ZnTe).
quantum dots photoluminescence multiphonon raman spectroscopy