Abstract
Fullerene–poly(ethylene dioxythiophene) (polyEDOT) composite films consisting of 3,4-ethyeledioxythiophene (EDOT) and a thiophene derivative of C60 fullerene (ThC60) or C60 fullerene were fabricated on a transparent indium–tin-oxide (ITO) electrode by electrochemical polymerization of the electrolyte solution of ThC60 (or C60) and EDOT. Incorporation of the C60 fullerene moiety in the polythiophene film was strongly suggested from absorption spectra of the composite film. We have found a higher degree of incorporation of the C60 fullerene moiety into the ThC60–polyEDOT film, as compared with the C60–polyEDOT film. In the presence of methylviologen as an electron acceptor, the as-prepared C60–polyEDOT and ThC60–polyEDOT composite films generated stable cathodic photocurrents in the 400–700 nm region with broad peaks. The photocurrent intensity and the internal photon-to-current quantum efficiency of the ThC60–polyEDOT composite film were considerably larger than those of C60–polyEDOT and polyEDOT films. The thiophene unit of ThC60 was confirmed to be quite effective for a stable incorporation of the C60 fullerene moiety in the film and a higher photocurrent generation.
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