4.6 Article

Electronic structure and band-gap modulation of graphene via substrate surface chemistry

Journal

APPLIED PHYSICS LETTERS
Volume 94, Issue 3, Pages -

Publisher

AMER INST PHYSICS
DOI: 10.1063/1.3070238

Keywords

density functional theory; energy gap; monolayers; surface chemistry; graphene

Funding

  1. IFC
  2. CCNI

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We have studied the electronic structure of graphene deposited on a SiO2 surface using density functional methods. The band structure of the graphene monolayer strongly depends on surface characteristics of the underlying SiO2 surface; for an oxygen-terminated surface, the monolayer exhibits a finite energy band gap while the band gap is closed when the oxygen atoms on the substrate are passivated with hydrogen atoms. We find that at least a graphene bilayer is required for a near zero energy gap when deposited on a substrate without H-passivation. Our results are discussed in the light of recent experiments.

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