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

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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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Authors and Affiliations

  1. Department of Physics and State Key Lab of Low-Dimensional Quantum Physics, Tsinghua University, Beijing, 100084, China

    Mingjie Yang, Jia-Lin Zhu & Jia-Lin Sun

  2. Laboratory of Advanced Materials, Department of Material Science and Engineering, Tsinghua University, Beijing, 100084, China

    Mingjie Yang & Wei Liu

Authors
  1. Mingjie Yang
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  2. Jia-Lin Zhu
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  3. Wei Liu
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  4. Jia-Lin Sun
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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

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