Journal
NANO LETTERS
Volume 11, Issue 11, Pages 4631-4635Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl202131q
Keywords
Graphene; boron nitride; electrostatic doping; interface dipoles; electronic structure
Categories
Funding
- European project MINOTOR [FP7-NMP-228424]
- Stichting Nationale Computerfaciliteiten (NCF)
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)
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When combined with graphene, hexagonal boron nitride (h-BN) is an ideal substrate and gate dielectric with which to build metal vertical bar h-BN vertical bar graphene field-effect devices. We use first-principles density functional theory (DFT) calculations for Cu vertical bar h-BN vertical bar graphene stacks to study how the graphene doping depends on the thickness of the h-BN layer and on a potential difference applied between Cu and graphene. We develop an analytical model that describes the doping very well, allowing us to identify the key parameters that govern the device behavior. A predicted intrinsic doping of graphene is particularly prominent for ultrathin h-BN layers and should be observable in experiment. It is dominated by novel interface terms that we evaluate from DFT calculations for the individual materials and for interfaces between h-BN and Cu or graphene.
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