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Infrared Conductivity and Carrier Mobility of Large Scale Graphene on Various Substrates

Cited 3 time in Web of Science Cited 3 time in Scopus
Authors
Kim, Joo Youn; Rho, Jae Noon; Lee, Chul; Bae, Sukang; Kim, Sang Jin; Kim, Keun Soo; Hong, Byung Hee; Choi, E. J.
Issue Date
2012-07
Citation
Journal of Nanoscience and Nanotechnology, Vol.12 No.7, pp.5816-5819
Keywords
CVD GrapheneSubstrate EffectInfrared FTIR
Abstract
It is known that low-field mobility of graphene depends largely on the substrate material on which it is transferred. We measured Drude optical conductivity of graphene on various substrates and determined the carrier density and carrier scattering rate. The carrier density varies widely depending on the substrate material. However the scattering rate is almost constant, similar to 100 cm(-1), for 5 different substrates. We calculate carrier mobility of graphene using the two quantities, i.e., carrier density and scattering rate, to find that it agrees with the mobility measured from dc transport experiment. We conclude that substrate-depent mobility of graphene originates from different carrier density but not from the scattering rate.
ISSN
1533-4880
URI
https://hdl.handle.net/10371/172204
DOI
https://doi.org/10.1166/jnn.2012.6347
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College of Natural Sciences (자연과학대학)Dept. of Chemistry (화학부)Journal Papers (저널논문_화학부)
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