Electrical conductivity of poly(N-vinylcarbazole)-based polysodium-2,9,16,23-tetramethylamine tetracyclohexane tetrazaporphyrin composites

Efforts to improve dc-conductivity in poly(N-vinylcarbazole) (PVK) are addressed through composites. Such systems included phthalocyanine-based additives with both electronic and ionic character. We present a polysodium-2,9,16,23- tetramethylamine tetracyclohexanetetrazaporphyrine, acting as the conductive additive in a PVK-binder. A paramagnetic behaviour appears in the additive when heated in the range 70-100C, which induced further conductivity in the sample. Dc-electrical conductivity was studied for different PVK-additive compositions, in isothermal conditions, using a sandwich Pt/sample/Pt cell. By applying the Poole-Frenkel theory a trapping state was evidenced showing temperature and electric field dependence. An electric field of 9x10(4)V/m establishes a frontier from which the conductivity mechanism is changed. Mobility of charge carriers was calculated according to the Mott-Gurney's equation.