Wednesday, May 13, 2015

Abstract-Terahertz photodetector based on double-walled carbon nanotube macrobundle–metal contacts

Yingxin Wang, Xiangquan Deng, Guowei Zhang, Jinquan Wei, Jia-Lin Zhu, Zhiqiang Chen, Ziran Zhao, and Jia-Lin Sun

We report on the characterization of a terahertz (THz) photodetector with an extremely simple structure consisting of only a macroscopic bundle of double-walled carbon nanotubes (DWCNTs) suspended between two metal electrodes. Polarization-sensitive, broadband, and significant photoresponse occurring at the DWCNT–metal contacts under THz illumination are observed with room-temperature photocurrent and photovoltage responsivities up to ∼16 mA/W and ∼0.2 V/W at 2.52 THz, respectively. Scanning photocurrent measurements provide evidence that the photothermoelectric mechanism dominates the detector response. The simple geometry and compact nature of our device make it suitable for integration and show promising applications for THz detection.
© 2015 Optical Society of America
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