NANOCRYSTALS OF CDSE IN THIN-FILM SIOX MATRIX

Nanocrystals of CdSe have been produced in an SiOx thin film matrix by thermal vacuum evaporation of SiO and CdSe. A new way of forming CdSe nanoclusters in the matrix has been used. The average size of the CdS e nanocrystals, between 2.4 nm and 6.0 nm, has been estimated from the (110) maximum in the x-ray diffraction spectra. Quantum size increase of the optical bandgap of the CdSe nanocrystals has been observed. A good coincidence between the average size of the nanocrystals calculat ed from the observed bandgap increase and x-ray diffraction measuremen t has been obtained. The substructure observed in the nanocrystal abso rption can be related to relatively small nanocrystal size fluctuation s around the average size.