Photoconductivily of Poly(3-alkylthiophene) in Solid and Liquid States

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Abstract
Photoconductivity has been observed in poly(3-alkylthiophene), not only in the solid state but also in the liquid state. Irradiation of the anode induces photoconductive response for a photon energy smaller than the band gap. On the other hand, upon irradiation of the cathode, photoconductivity was observed for light of photon energies both higher and lower than the band gap. Photoconduction is also strongly dependent on temperature. Especially remarkable is photoconductivity in the liquid phase upon irradiation of the cathode with light of photon energy larger than the band gap. These results support the hypothesis that the electronic band scheme is also applicable to the liquid state.