PREPARATION, GROWTH MECHANISM AND CHEMICAL COMPOSITIONAL ANALYSIS OF NANOCRYSTALLINE SB{sub}2(S{sub}(1-x),SE{sub}x){sub}3 THIN FILMS USING ARRESTED PRECIPITATION TECHNIQUE (APT)

摘要

Combinational thin films of antimony sulphoselenide [Sb{sub}2(S{sub}(1-x)Se{sub}x){sub}3] have been synthesized on a good quality glass substrates using newly developed arrested precipitation technique (APT) by us. Sb(III) ions were arrested using aqueous alkaline solution of organic complexing agent. Highly reflecting uniform and tightly adhesive thin films were formed by optimizing various preparative conditions such as concentration, temperature, pH and rate of agitation on to a amorphous glass substrates. For the first time antimony chalcogenide films were analysed using 4' bromo PTPT reagent by spectrophotometric and atomic absorption spectroscopic (AAS) technique. Statistical assessment of the results show the formation of combinatorial thin films of Sb{sub}2S{sub}3 with Sb{sub}2Se{sub}3 which confirm the general formula [Sb{sub}2(S{sub}(1-x)Se{sub}x){sub}3]. A band gap of combinatorial phase of [Sb{sub}2(S{sub}0.5Se{sub}0.5){sub}3] 1.65eV is obtained from electrical and optical studies. From the electrical measurement an activation energy of 0.8eV is obtained in the temperature range 273-475K. Optical absorption studies show that transitions are direct and allowed ones.