Characteristics of photoconductivity in As-Sb-Se glasses

Characteristic features of photoconductivity in AsxSb15Se85-x and AsxSb10Se 90-x bulk glass systems have been measured and reported. Both a.c and d.c t echniques have been employed for the measurements. The temperature dependen ce of photoconductivity has been analysed in terms of the ABFH model and bo th systems are found to exhibit type I photoconductivity. Photoconductivity shows a clear change in slope corresponding to the stoichiometric composit ion in both the systems. The composition dependence of photoconductivity is explained on the basis of chemically ordered covalent network (COCN) model . Photoconductivity response time of the two systems have been determined f rom frequency-resolved photocurrent (FRPC) measurements. Variation of respo nse time with composition exhibits a clear change in slope at the stoichiom etric composition in both the systems.