Research Article

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2011, 4(9): 901–907

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

Novel Photodetectors Based on Double-Walled Carbon Nanotube Film/TiO2 Nanotube Array Heterodimensional Contacts

Mingjie Yang1,2, Jia-Lin Zhu1 (), Wei Liu2

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(), and Jia-Lin Sun1 ()

Keywords: Photodetectors, double-walled carbon nanotube (DWCNT) films, TiO2 nanotube arrays, heterodimensional contacts
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  • Abstract
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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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Novel Photodetectors Based on Double-Walled Carbon Nanotube Film/TiO2 Nanotube Array Heterodimensional Contacts. Nano Res. 2011, 4(9): 901–907 https://doi.org/10.1007/s12274-011-0146-5

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