Thermoelectric properties and intermolecular conductive mechanism of conjugated polymers

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The purpose of this study is to clarify some determining factors of conductive mechanisms of polythiophene series and the effect of the mechanism on the thermoelectric properties. Polythiophenes with different molecular weight of side chains were synthesized by oxidative polymerization and electrolytic polymerization. The results are as follows : 1) polythiophenes with no side chain showed a variable range hopping due to short distance between polythiophene main chains. 2) poly-alkyltiohpenes showed nearest neighbor distance hopping. 3) polythiophene series change the conductive mechanism accompanied with the distance between the main chains. 4) thermoelectric properties are closed related to the distance between the main chains and the density of main chain in an unit volume.