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Ultra-broadband photodetectors based on epitaxial graphene quantum dots

Title
Ultra-broadband photodetectors based on epitaxial graphene quantum dots
Authors
A. El FatimyA. NathB. D. KONGA. K. BoydR. L. Myers-WardK. M. DanielsM. M. JadidiT. E. MurphyD. K. GaskillP. Barbara
POSTECH Authors
B. D. KONG
Date Issued
Feb-2018
Publisher
DE GRUYTER
Abstract
Graphene is an ideal material for hot-electron bolometers due to its low heat capacity and weak electron-phonon coupling. Nanostructuring graphene with quantum-dot constrictions yields detectors of electromagnetic radiation with extraordinarily high intrinsic responsivity, higher than 1 x 10(9) V W -1 at 3 K. The sensing mechanism is bolometric in nature: the quantum confinement gap causes a strong dependence of the electrical resistance on the electron temperature. Here, we show that this quantum confinement gap does not impose a limitation on the photon energy for light detection and these quantum-dot bolometers work in a very broad spectral range, from terahertz through telecom to ultraviolet radiation, with responsivity independent of wavelength. We also measure the power dependence of the response. Although the responsivity decreases with increasing power, it stays higher than 1 x 10(8) V W-1 in a wide range of absorbed power, from 1 pW to 0.4 nW.
URI
http://oasis.postech.ac.kr/handle/2014.oak/94125
DOI
10.1515/nanoph-2017-0100
ISSN
2192-8606
Article Type
Article
Citation
Nanophotonics, vol. 7, no. 4, page. 735 - 740, 2018-02
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