Journal
APPLIED PHYSICS LETTERS
Volume 95, Issue 22, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3269597
Keywords
carrier density; graphene; surface potential; work function
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Funding
- Korean Ministry of Education, Science and Technology (MEST)
- Korea Science and Engineering Foundation (KOSEP) [M10531020001-08N3102-00110]
- Ministry of Knowledge Economy (MKE)
- Korea Industrial Technology Foundation (KOTEF)
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We report on the interlayer screening effect of graphene using Kelvin probe force microscopy (KPFM). By using a gate device configuration that enables the supply of electronic carriers in graphene sheets, the vertical screening properties were studied from measuring the surface potential gradient. The results show layer-dependence of graphene sheets, as the number of graphene layers increases, the surface potential decreases exponentially. In addition, we calculate the work function-related information of the graphene layers using KPFM.
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