An oligomer, belonging to the class of alkoxythiophenes, was polymerized by vapour-phase polymerization and its electrical properties were investigated both in time and temperature. The time stability in air resulted to be improved with respect to polypyrrole obtained with the same technique. Thermally-activated conduction behaviour was observed below 50 degrees C; irreversible phenomena take place above this temperature. 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 technique were also investigated.
Temperature behaviour and 1/f noise of poly-alkoxythiophene and polypyrrole thin film microstructures
BRUSCHI, PAOLO;NANNINI, ANDREA;SERRA, GIORGIO;
1996-01-01
Abstract
An oligomer, belonging to the class of alkoxythiophenes, was polymerized by vapour-phase polymerization and its electrical properties were investigated both in time and temperature. The time stability in air resulted to be improved with respect to polypyrrole obtained with the same technique. Thermally-activated conduction behaviour was observed below 50 degrees C; irreversible phenomena take place above this temperature. 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 technique were also investigated.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
