TEMPERATURE BEHAVIOR AND 1 F NOISE OF POLY-ALKOXYTHIOPHENE AND POLYPYRROLE THIN-FILM MICROSTRUCTURES/

An oligomer, belonging to the class of alkoxythiophenes, was polymeriz ed by vapour-phase polymerization and its electrical properties were i nvestigated both in time and temperature. The time stability in air re sulted to be improved with respect to polypyrrole obtained with the sa me technique. Thermally-activated conduction behaviour was observed be low 50 degrees C; irreversible phenomena take place above this tempera ture. The results were fitted into both tunnelling and variable range- hopping conductivity models; the density of states at the Fermi energy and the number of charge carriers were calculated. Measurements of 1/ fnoise were performed in order to check the validity of the Hooge law for this polymer. Spatial resolution limits of the polymerization tech nique were also investigated.