Transport properties of conducting polythiophene-polystyrene composites

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Abstract
Experimental results on electrical conductivity and thermoelectric power for (FeCl3 - doped polythiophene) - polystyrene composites have been performed in the temperature range 77 - 300 K and with polythiophene content in the vicinity and exceeding the percolation threshold. The thermoelectric power observed experimentally exhibits a surprisingly nearly linear behaviour versus T related to the slightly thermally activated electrical conductivity variations. All these results are analyzed in terms of hopping mechanisms. A model involving both the intrinsic resistance of the polythiophene domains and the resistance of the junctions between these domains is considered. The reduction of FeIIIin FeII during the polymerization reaction is discussed on the basis of XPS analysis results

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