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Title: Photoresponse in epitaxial graphene with asymmetric metal contacts
Authors: Sevak Singh, R.
Nalla, V. 
Chen, W. 
Ji, W. 
Wee, A.T.S. 
Issue Date: 27-Feb-2012
Citation: Sevak Singh, R., Nalla, V., Chen, W., Ji, W., Wee, A.T.S. (2012-02-27). Photoresponse in epitaxial graphene with asymmetric metal contacts. Applied Physics Letters 100 (9) : -. ScholarBank@NUS Repository.
Abstract: We report photoresponse observations in epitaxial graphene (EG) devices with asymmetric metals (Au, Al) contacted in planar Au/EG/Al device format. The transient photocurrent measurements on the zero-bias device show photocurrent maxima at the Au/EG contact and minima at the EG/Al contact. This observed significant difference between the two types of junctions is responsible for the overall efficient device photoresponse. We have also found that the number of EG layers influences the photocurrent magnitude and response time regardless of incident photon energy or intensity. An external photoresponsivity (or efficiency) of ∼31.3 mA W -1 is achieved with a biased Au/EG/Al photodetector at excitation wavelength of 632.8 nm. © 2012 American Institute of Physics.
Source Title: Applied Physics Letters
ISSN: 00036951
DOI: 10.1063/1.3692107
Appears in Collections:Staff Publications

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