Photoconductivity in Semiconducting Single-Walled Carbon Nanotubes.

  • Fujiwara Akihiko
    Department of Physics, School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
  • Matsuoka Yasuyuki
    Department of Physics, School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
  • Suematsu Hiroyoshi
    Department of Physics, School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
  • Ogawa Naoki
    Department of Applied Physics, School of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
  • Miyano Kenjiro
    Department of Applied Physics, School of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
  • Kataura Hiromichi
    Department of Physics, School of Science, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachi-oji, Tokyo 192-0397, Japan
  • Maniwa Yutaka
    Department of Physics, School of Science, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachi-oji, Tokyo 192-0397, Japan
  • Suzuki Shinzo
    Department of Chemistry, School of Science, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachi-oji, Tokyo 192-0397, Japan
  • Achiba Yohji
    Department of Chemistry, School of Science, Tokyo Metropolitan University, 1-1 Minami-osawa, Hachi-oji, Tokyo 192-0397, Japan

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We have observed the photoconductive response of film samples of single-walled carbon nanotubes for the first time. Two peaks in the photoconductivity excitation spectra around 0.7 and 1.2 eV are observed at room temperature, which can be interpreted as a photocurrent in semiconducting nanotubes. At a low temperature, we found a marked change in the intensity of the spectrum. In this paper, we discuss this temperature dependence and the mechanism of photoconductivity.

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