A variety of mixed or composite II-VI semiconductor nanoparticles (NPs) have been developed and studied up to now in view of their novel physical properties and promising applications in biolabeling, catalysis, LED and photovoltaics technologies. Depending on the bands offset in the composite (core-shell) NPs, one can achieve either stronger confinement of the photogenerated charge carriers within the luminescing NPs, as in CdSe/CdS with consequent PL buildup, or escape of the charge carriers from the core to shell (well), as in CdS/CdSe, or quantum dot – quantum well NPs, such as CdS/CdSe/CdS. In the present report the photocatalytically-produced CdS/CdSe NPs are studied in dependence on the CdSe coverage and excitation wavelength of the Raman spectra. An “island-like” growth mode of CdSe on the CdS-core NP surface is derived from this study. This is in contrast to the generally observed smooth shells in common colloidal CdSe-core NPs, but resembles the case of epitaxially-grown nanoislands, self-assembled in the Stranski-Krastanow mode. The peculiarities of the Raman spectra of the CdS/CdSe/CdS quantum dot – quantum well NPs are also discussed.

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1. Raman scattering on semiconductor microtubes
2. Probing the structure of core-shell nanoparticles by resonant Raman scattering spectroscopy
3. Phonons in InAs Quantum Dot Structures
4. Phonon spectra of quaternary II-VI semiconductor nanocrystals grown in glass matrices
5. Surface phonons in CdS_1–xSe_x semiconductor nanoparticles embedded in dielectric media
6. Phonon spectroscopy of CdSe_1–xTe_x nanocrystals grown in a borosilicate glass
7. Raman Monitoring of Organic/Inorganic Interface Formation
8. Formation of Ge nanoislands on pure and oxidized Si surface by MBE