PHOTOCONDUCTIVITY STUDIES OF (PBCRO4-HGO-ZNO) COMPOSITES

This paper deals with the photoconductivity studies of (PbCrO4-HgO-ZnO ) composites comprising of base materials of three different energy ga ps. The response of (10%PbCrO4-80%HgO-10% ZnO) and (20%PbCrO4-60%HgO-2 0%ZnO) composites is faster than that of other compositions and of bas e materials. The dark current for (20%PbCrO4-60%HgO-20%ZnO) is trap li mited-space charge limited at higher voltages while it shows non-ohmic behaviour at lower voltages. The photocurrent for (20%PbCrO4-60%HgO-2 0%ZnO) composition shows non-ohmic behaviour at lower voltages and ten ds to saturation at higher voltages. The photocurrent for the above co mposition varies sublinearly with the intensity of illumination. The ( 10% PbCrO4-80%HgO-10%ZnO) composition is the best suitable material fo r optical switching. The existence of discrete trap depths at 16-degre es-C appears plausible for different compositions.