ELECTRICAL-PROPERTIES OF PHENYLENE VINYLENE OLIGOMER THIN-FILMS

In this work, we report the results of electrical investigations on ph enylene vinylene oligomer thin films with 5-phenyl, 4-vinyl compound ( 4PV). Synthesis of the oligomer powder was performed using a Wittig re action of phosphonium salt with carbonyl group and thin films were dep osited by conventional thermal evaporation under vacuum of the obtaine d powder. The conduction mechanisms of oligomer-based diodes were stud ied by measuring the current-voltage-temperature characteristics and t he thermally stimulated current. In the high-temperature range, Poole- Frenkel emission is observed while, at lower temperatures, a hopping p rocess probably occurs. Data from the thermally stimulated current mea surements involve shallow traps (0.42 eV) which might originate from t he 4PV/metal interface region.