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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 5 — Mar. 10, 2014
  • pp: 5895–5903

Photocurrent response of carbon nanotube–metal heterojunctions in the terahertz range

Yingxin Wang, Guowei Zhang, Lingbo Qiao, Jinquan Wei, Jia-Lin Zhu, Zhiqiang Chen, Ziran Zhao, and Jia-Lin Sun  »View Author Affiliations


Optics Express, Vol. 22, Issue 5, pp. 5895-5903 (2014)
http://dx.doi.org/10.1364/OE.22.005895


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Abstract

We investigate the optoelectronic properties of a carbon nanotube (CNT)–metal heterostructure in the terahertz range. On the basis of terahertz time-domain spectroscopy characterization of a double-walled CNT (DWNT) film, we present and analyze the photocurrent measurement for a DWNT–nickel heterojunction illuminated by continuous-wave terahertz radiation. A significant current across the junction directly induced by terahertz excitation is observed and a negative photoconductivity behavior is found to occur in the device. The photocurrent shows a linear response to the bias voltage and the illumination power within the examined range. These phenomena support the feasibility of using CNT–metal heterojunctions as novel terahertz detectors.

© 2014 Optical Society of America

OCIS Codes
(230.5160) Optical devices : Photodetectors
(040.2235) Detectors : Far infrared or terahertz
(160.4236) Materials : Nanomaterials

ToC Category:
Materials

History
Original Manuscript: December 6, 2013
Revised Manuscript: February 16, 2014
Manuscript Accepted: February 27, 2014
Published: March 6, 2014

Citation
Yingxin Wang, Guowei Zhang, Lingbo Qiao, Jinquan Wei, Jia-Lin Zhu, Zhiqiang Chen, Ziran Zhao, and Jia-Lin Sun, "Photocurrent response of carbon nanotube–metal heterojunctions in the terahertz range," Opt. Express 22, 5895-5903 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-5-5895


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