Excellent ambipolar photoconductivity of PVK film doped with fluoroperylene diimide

We report a novel bipolar charge transport material in a single-layer photoreceptor. Using the so-called photoinduced xerographic discharge technique, photoconductivity of the material was measured in positive charging and negative charging conditions, respectively. In both cases, it exhibited excellent photoconductivity. The material was obtained by doping poly(N-vinyl carbazole) (PVK) with a novel organic electron acceptor of N,N′-diperfluorophenyl-3,4,9,10-perylenetetracarboxylic diimide (DFPP). The combined efforts of UV–Vis absorption, DSC, XPS and cyclic voltammetry characterizations demonstrated that D–A complex was formed between DFPP (A) and PVK (D) due to their different electron affinities. The data also suggested that electron transport channels composed of DFPP molecules might exist in the film, providing the film not only high exciton dissociation efficiency but also good electron transport ability. The electronic and structural properties of the DFPP-doped PVK film are also reported.