This paper deals with the photoconductivity studies of (PbCrO4-HgO-ZnO) composites comprising of base materials of three different energy gaps. The response of (10%PbCrO4-80%HgO-10%ZnO) and (20%PbCrO4-60%HgO-20%ZnO) composites is faster than that of other compositions and of base materials. The dark current for (20%PbCrO4-60%HgO-20%ZnO) is trap limited-space charge limited at higher voltages while it shows non-ohmic behaviour at lower voltages. The photocurrent for (20%PbCrO4-60%HgO-20%ZnO) composition shows non-ohmic behaviour at lower voltages and tends to saturation at higher voltages. The photocurrent for the above composition varies sublinearly with the intensity of illumination. The (10% PbCrO4-80%HgO-10%ZnO) composition is the best suitable material for optical switching. The existence of discrete trap depths at 16°C appears plausible for different compositions.
Volume 94, 2019
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