| Vol. 53,
No. 5 November 1999 pp. 891-902 Characteristics of photoconductivity in As-Sb-Se glasses G MATHEW and J PHILIP Department of
Instrumentation, Cochin University of Science and
Technology,ochin 682 022, India Abstract. Characteristic features of photoconductivity in AsxSb15 Se85 _ x and AsxSb10 Se90 _ x bulk glass systems have been measured and reported. Both a.c and d.c techniques have been employed for the measurements. The temperature dependence of photoconductivity has been analysed in terms of the ABFH model and both systems are found to exhibit type I photoconductivity. Photo-conductivity shows a clear change in slope corresponding to the stoichiometric composition in both the systems. The composition dependence of photoconductivity is explained on the basis of chemi-cally ordered covalent network (COCN) model. Photoconductivity response time of the two systems have been determined from frequency-resolved photocurrent (FRPC) measurements. Variation of response time with composition exhibits a clear change in slope at the stoichiometric composition in both the systems. Keywords. Photoconductivity; chalcogenide glasses. PACS Nos 72.40; 72.80.N |