STRUCTURAL AND MORPHOLOGICAL CHARACTERIZATIONS OF THE THIN CUINS2 AND IN-S LAYERS AIRLESS SPRAY

We have prepared CuInS2 thin layers by airless spray << S.P.A. >> in order to use them as an absorber in a photovoltaic cell. The X-ray diffraction analysis has showed that these layers are well crystallized with a privileged (112) principal orientation for a ratio of the concentrations in the pulverized solution x = [Cu(I)]/[In(III)] = 1.1. After heat treatment under vacuum the crystallization have been clearly improved. The structural analysis of the thin CuInS2 layers have revealed that a secondary phases of In2S3 and In6S7 are present. Thus we have realized by the same technique thin In-S layers whose structural and morphological properties have been studied. This analysis has showed that the In-S layers are well crystallized for a ratio y = [In3+]/[S2-] = 0.6 in the spray solution. The In-S layers are essentially formed by a beta-In2S3 material. Although the In6S7 phase appears to the detriment of beta-In2S3 phase for y = 0.75.