DIELECTRIC-PROPERTIES OF POLY(PHENYLENE-VINYLENE) THIN-FILMS

in the search for the characterization of new potential polymers for f uture applications in electronic devices, the dielectric properties of polyparaphenylene-vinylene (PPV) thin films were studied. The frequen cy responses of metal-PPV-metal structures were investigated as a func tion of temperature. The nature of the dielectric relaxation, the cond uctivity and the influence of interfacial polarization are discussed a nd correlated with previous studies of d.c. conductivity and thermally stimulated currents. We show that, in addition to the bulk relaxation observed in the high frequency range, a second relaxation mechanism o ccurs at low frequencies and is related to the interfacial contact bet ween the metal and PPV.