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http://dx.doi.org/10.5369/JSST.2019.28.2.117

Effects of Optically-modulated Metal-graphene Contact on the Photoresponsivity of Graphene Photodetectors  

Lee, Chang-Ju (School of Electronics Engineering, Kyungpook National Unversity)
Shim, Jae Hoon (School of Electronics Engineering, Kyungpook National Unversity)
Park, Hongsik (School of Electronics Engineering, Kyungpook National Unversity)
Publication Information
Journal of Sensor Science and Technology / v.28, no.2, 2019 , pp. 117-120 More about this Journal
Abstract
Graphene is recognized as a promising material for silicon photonics, since it has a wide optical-window that entirely covers the optical communication wavelength region ($1.3{\sim}1.6-{\mu}m$) and extremely high-carrier mobility that makes it possible to fabricate the high-speed photodetectors. However, the maximum absorbance of monolayer graphene is only 2.3%, which limits the photoresponse characteristics of graphene photodetectors. As a result, a low photoresponsivity of graphene photodetector is a critical issue limiting the use of graphene photodetectors in the optical communications field. In this paper, we investigated effects of optically-modulated metal-graphene contact on the photoresponsivity of graphene photodetectors. The optical modulation of the contact resistance mainly determined the photoresponse characteristics of graphene photodetectors. The Ni-contact graphene photodetector which has a characteristic of the significant optical modulation of metal-graphene contact showed a higher photoresponsivity than the Pd-contact device. This work will provide a way to improve the photoresponse characteristics of graphene-based photodetector and contribute to the development of high-speed/high-responsivity graphene photodetector.
Keywords
Graphene; Photodetector; Optically-modulated contact; Metal-graphene contact; Photoresponsivity;
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