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Single n+-i-n+ InP nanowires for highly sensitive terahertz detection

Peng, Kun, Parkinson, Patrick, Gao, Qian, Boland, Jessica L, Li, Ziyuan, Wang, Fan, Mokkapati, Sudha, Fu, Lan, Johnston, Michael B, Tan, Hark Hoe and Jagadish, Chennupati 2017. Single n+-i-n+ InP nanowires for highly sensitive terahertz detection. Nanotechnology 28 (12) , 125202. 10.1088/1361-6528/aa5d80

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Abstract

Developing single-nanowire terahertz (THz) electronics and employing them as sub-wavelength components for highly-integrated THz time-domain spectroscopy (THz-TDS) applications is a promising approach to achieve future low-cost, highly integrable and high-resolution THz tools, which are desirable in many areas spanning from security, industry, environmental monitoring and medical diagnostics to fundamental science. In this work, we present the design and growth of n+-i-n+ InP nanowires. The axial doping profile of the n+-i-n+ InP nanowires has been calibrated and characterized using combined optical and electrical approaches to achieve nanowire devices with low contact resistances, on which the highly-sensitive InP single-nanowire photoconductive THz detectors have been demonstrated. While the n+-i-n+ InP nanowire detector has a only pA-level response current, it has a 2.5 times improved signal-to-noise ratio compared with the undoped InP nanowire detector and is comparable to traditional bulk THz detectors. This performance indicates a promising path to nanowire-based THz electronics for future commercial applications.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Uncontrolled Keywords: InP nanowire, axial doping, terahertz, optoelectronics, photonics, detector
Publisher: IOP Publishing
ISSN: 0957-4484
Date of First Compliant Deposit: 25 May 2017
Date of Acceptance: 1 February 2017
Last Modified: 04 Jun 2017 09:50
URI: http://orca-mwe.cf.ac.uk/id/eprint/100848

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