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Novel photodetectors based on double-walled carbon nanotube film/TiO2 nanotube array heterodimensional contacts

Abstract

A new kind of photodetector based on a double-walled carbon nanotube (DWCNT) film and a TiO2 nanotube array with hetrodimensional non-ohmic contacts has been fabricated. Due to the dimensionality difference effect, the DWCNT film/TiO2 nanotube array photodetector exhibits a much higher photocurrent-to-dark current ratio and photoresponse relative to an Au film/TiO2 nanotube array device, even at small bias voltage. The photocurrent-to-dark current ratio reached four orders of magnitude and a high photoresponse of 2467 A/W was found upon irradiation at 340 nm. Furthermore, the photosensitive regions could be extended into the visible range. The photocurrent-to-dark current ratio reached approximately three orders of magnitude upon irradiation at 532 nm, where the photon energy is much lower than the band gap of TiO2.

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Correspondence to Jia-Lin Zhu, Wei Liu or Jia-Lin Sun.

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Yang, M., Zhu, JL., Liu, W. et al. Novel photodetectors based on double-walled carbon nanotube film/TiO2 nanotube array heterodimensional contacts. Nano Res. 4, 901–907 (2011). https://doi.org/10.1007/s12274-011-0146-5

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  • DOI: https://doi.org/10.1007/s12274-011-0146-5

Keywords

  • Photodetectors
  • double-walled carbon nanotube (DWCNT) films
  • TiO2 nanotube arrays
  • heterodimensional contacts