title: Terahertz photodetector based on double-walled carbon nanotube macrobundle-metal contacts.
abstract: 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.
authors.forename: Yingxin
authors.initials: Y
authors.lastname: Wang
authors.forename: Xiangquan
authors.initials: X
authors.lastname: Deng
authors.forename: Guowei
authors.initials: G
authors.lastname: Zhang
authors.forename: Jinquan
authors.initials: J
authors.lastname: Wei
authors.forename: Jia-Lin
authors.initials: JL
authors.lastname: Zhu
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Chen
authors.forename: Ziran
authors.initials: Z
authors.lastname: Zhao
authors.forename: Jia-Lin
authors.initials: JL
authors.lastname: Sun