AC-Impedance Spectroscopic Analysis on the Charge Transport in CVD-Grown Graphene Devices with Chemically Modified Substrates

作者：Min Bok Ki; Kim Seong K; Kim Seong Ho; Kang Min A; Noothongkaew Suttinart; Mills Edmund M; Song Wooseok; Myung Sung; Lim Jongsun; Kim Sangtae; An Ki Seok^*

来源：ACS Applied Materials & Interfaces, 2016, 8(41): 27421-27425.

DOI：10.1021/acsami.6b03705

• CVD-grown graphene
• ac-impedance spectroscopy
• self-assembled monolayers (SAMs)
• charge transport
• ac conduction

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/SiO2 interface 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 SiO2 surface.

• 出版日期2016-10-19