High photoconductivity properties of perylene polyimide containing triarylamine unit

The large photoinduced currents in monolayers employing thin films of N,N′-dialkyl perylene-3,4:9,10-biscarboximide derivatives as charge photogeneration units and 4,4′-biaminetriphenylamine as charge transporting groups were investigated. The polymerization was carried out in m-cresol and the electric state of polyimide was maintained even after incorporating the chromophore into the polymer. It was found that the current density versus incidence was similar to the UV absorption of polyimides and indicated that photocharge originated the electron structure. The results show that when 544 nm light irradiated the film the current density is the biggest.