Elaboration, caractérisation structurale et optique des nanocristaux du semiconducteur ZnSe dispérsés dans les matrices

Abstract

In this work we can find many and different results about the elaboration, structural and characterization of semiconductor ZnSe nanocrystals imbedded in the matrices: the silica and the polymers. The sol - gel method was used in the preparation of simples and the incorporation of the nanocrystals of the semiconductor ZnSe was effected at liquid stat in the two matrices. The characterization of X - ray diffraction has showed the presence of the semiconductor ZnSe in the two matrices. The Raman spectra of doped samples show additive pics compared with Raman spectra of indoped simples and then confirmes the presence of the nanocrystals semiconductor ZnSe The optical density measurements in the UV-Visible range show a shift of the ZnSe band edge to the height energy ( the low- waxes lengths ) in comparison with the edge to the bulk crystal. This shift is due to the contlnement caused by the nanometric size of ZnSe semiconductor. A second optical characterization by the Photoluminescence spectroscopy has showed that the elaborated simples have a luminescence bands in the visible rang. This result gives the possibility to consider these samples as optically actives materials.