Charge Transfer Sensitization of Some Organic Photoconductors Based on Carbazole

Abstract

The photoresponse of thin layers of vinyl carbazole (VK), dissolved in an acrylic binder, and of polyvinyl carbazole (PVK) was measured in a quasi-xerographic mode. Complexing with strong electron acceptors gives rise to visible charge transfer bands, which are found to be efficient at exciting photoresponse in this part of the spectrum. In the case of the binder layers, complexing greatly enhances UV response, as well. The observed photoresponse is tentatively accounted for by the photosensitized injection of carriers into the dielectric layer, rather than by bulk photoconductivity.