Dynamics of nanostructures (nanocones and nanocavities) formation on surface of semiconductors by laser radiation based on Thermogradient effect was studied. Nanostructures formation of both nano-hills and nano-cavities were explained by point defects redistribution in gradient of temperature at the irradiated surface. Study of photoluminescence, atomic force microscopy and Raman back-scattering spectra speak in favour of presence of quantum confinement effect on the top of nanocones on the irradiated surface of semiconductor single crystals. Aggregation of vacancies under the irradiated surface forms nano-cavities.

Dynamics of Nanostructure Formation using Point Defects on Semiconductors by Laser Radiation. A.Medvid, P.Onufrijevs, E.Dauksta, J.Barloti, D.Grabovskis, A.Ulyashin: Physica Status Solidi C, 2009, 6[8], 1927-8