Abstract

Individual thiophene oligomers, n=2–5, have been isolated and doped by iodine in the gas phase. Their electrical and spectroscopic properties were compared with iodine doped polythiophene film. It is shown that long conjugation length is not requisite to achieve metallic conductivity and interchain carrier transport plays an important role to the transport mechanism. In the doped oligomers the mid-gap absorption shifted from visible region for n=2 to near infra red for n=4 and polythiophene film, while another absorption appeared below the band gap in doped polythiophene at 1.63 eV. We tentatively attribute the lower energy absorption observed for both doped oligomers and the doped polymer to charge transfer band. Four new IR modes in the region of 1000–1300 cm −1 observed in doped polythiophene film were present also in the doped oligomers. We prefer to attribute these IR absorptions to the vibration of charge transferred conjugated thiophene rings accompanied by a great enhancement of absorption intensity.

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