title: AC-Impedance Spectroscopic Analysis on the Charge Transport in CVD-Grown Graphene Devices with Chemically Modified Substrates.
abstract: A comprehensive study for the effect of interfacial buffer layers on the electrical transport behavior in CVD-grown graphene based devices has been performed by ac-impedance spectroscopy (IS) analysis. We examine the effects of the trap charges at graphene/SiO2interface on the total capacitance by introducing self-assembled monolayers (SAMs). Furthermore, the charge transports in the polycrystalline graphene are characterized through the temperature-dependent IS measurement, which can be explained by the potential barrier model. The frequency-dependent conduction reveals that the conductivity of graphene is related with the mobility, which is limited by the scattering caused by charged adsorbates on SiO2surface.
authors: Thin Film Materials Research Center, Korea Research Institute of Chemical Technology (KRICT) , Yuseong, Daejeon 305-600, Republic of Korea.|Department of Physics, Sungkyunkwan University , 2066 Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 440-746, Republic of Korea.
authors: Bok Ki
authors: BK
authors: Min
authors: Thin Film Materials Research Center, Korea Research Institute of Chemical Technology (KRICT) , Yuseong, Daejeon 305-600, Republic of Korea.
authors: Seong K
authors: SK
authors: Kim
authors: Thin Film Materials Research Center, Korea Research Institute of Chemical Technology (KRICT) , Yuseong, Daejeon 305-600, Republic of Korea.
authors: Seong Ho
authors: SH
authors: Kim
authors: Thin Film Materials Research Center, Korea Research Institute of Chemical Technology (KRICT) , Yuseong, Daejeon 305-600, Republic of Korea.
authors: Min-A
authors: MA
authors: Kang
authors: Thin Film Materials Research Center, Korea Research Institute of Chemical Technology (KRICT) , Yuseong, Daejeon 305-600, Republic of Korea.
authors: Suttinart
authors: S
authors: Noothongkaew
authors: Department of Chemical Engineering and Materials Science, University of California , Davis, California 95616-5294, United States.
authors: Edmund M
authors: EM
authors: Mills
authors: Thin Film Materials Research Center, Korea Research Institute of Chemical Technology (KRICT) , Yuseong, Daejeon 305-600, Republic of Korea.
authors: Wooseok
authors: W
authors: Song
authors: Thin Film Materials Research Center, Korea Research Institute of Chemical Technology (KRICT) , Yuseong, Daejeon 305-600, Republic of Korea.
authors: Sung
authors: S
authors: Myung
authors: Thin Film Materials Research Center, Korea Research Institute of Chemical Technology (KRICT) , Yuseong, Daejeon 305-600, Republic of Korea.
authors: Jongsun
authors: J
authors: Lim
authors: Department of Chemical Engineering and Materials Science, University of California , Davis, California 95616-5294, United States.
authors: Sangtae
authors: S
authors: Kim
authors: Thin Film Materials Research Center, Korea Research Institute of Chemical Technology (KRICT) , Yuseong, Daejeon 305-600, Republic of Korea.
authors: Ki-Seok
authors: KS
authors: An
keywords: CVD-grown graphene; ac conduction; ac-impedance spectroscopy; charge transport; self-assembled monolayers (SAMs)