Journal
ACS PHOTONICS
Volume 5, Issue 2, Pages 365-370Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.7b01405
Keywords
graphene; graphene photodetector; zero bias operation; asymmetric structure; graphene/metal contact
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Funding
- Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT, Korea [2015M3D1A1068062]
- Global Frontier Program through the Global Frontier Hybrid Interface Materials (GFHIM) through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT, Korea [2013M3A6B1078873]
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The responsivity of a graphene photodetector was substantially enhanced by modulating the potential gradient in a chemical vapor deposition-grown graphene channel using asymmetric metal contacts such as Ti, Pd, and Au for the source and drain. The photoresponsivity of a graphene photodetector with an asymmetric Au-Ti contact combination increased to 52 mA/W at an illumination power density of 0.25/4W/cm(2); this photoresponsivity is similar to 63 times higher than that of a graphene photodetector having a symmetric Au Au contact combination (0.82 mA/W).
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