CdZnSe/Zn(Be)Se Quantum Dot Structures: Size, Chemical Composition and Phonons

The size and chemical composition of optically active CdZnSe/ZnSe and CdZnSeZZn0.97Be0.03Se quantum dots (QDs) are determined using photoluminescence, photoluminescence excitation and polarized Raman scattering spectroscopies. We show that the addition of Be into the barrier enhances the Cd composition and the quantum size effect of optically active QDs. Additionally, surface phonons from QDs are observed in CdZnSe/ZnBeSe nanostructures.