Photoconductivity in thin films of a-Ga40SeXTe60-X

Present communication reports on photoconductivity measurements in thin films of Ga40SexTe60-x glasses (x = 20, 30, 40). Temperature dependence of steady state photocurrent and dark current show that dark and steady state photoconductivity are activated processes. Intensity dependence of photocurrent reveals about power law dependence of photocurrent on incident radiation. Also incorporated are the transient photoconductivity measurements on all the samples. The decay of photocurrent after the cessation of illumination has been found to be exponential in all the glasses. The decrease in Iph/Id can be explained in terms of the increasing no. of defect states with increasing Te content