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Electrical and ESR Studies on Polythiophene by Radiation-Induced Doping Effect

The relation between electrical conductivity and ESR characteristics in polythiophene upon doping has been studied in-situ by utilizing the radiation-induced doping effect. By irradiation under an SF6 atmosphere, the electrical conductivity remarkably increases accompanied by distinct changes in the optical and magnetic properties. It has clearly been observed that a new narrower ESR component (ΔHpp=ca. 1 G) with a smaller g-value emerges and grows with increasing irradiation dose. These results indicate that the carrier species for dilute doping levels are polarons.