Hole Injection from Polypyrrole Electrode into Organic Photoconductors

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Abstract
The interfacial hole infection from a conductive polymer to organic photoconductors was investigated. Polypyrrole in film was electrochemically synthesized on an indium-tin-oxide coated glass substrate and used as the conductive polymer. For the organic polymer to be coupled with the polypyrrole electrode, poly (N-vinylcarbazole) (PVK) or polycarbonate molecularly doped with one of the hole-transporting materials having a redox potential in the range of 0.09 to 0.6 V, was chosen. The hole injection was found to be a function of the conductivity. From the experiments using molecularly doped polycarbonate, it was pointed out that hole-transporting materials of lower oxidation potentials inject more holes. An acceleration of the injection was observed to take place from a photo-excited polypyrrole layer into a PVK or a hole-transporting layer doped with molecules of an adequate oxidation potential (0.21 V).

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