Oxygen surface functionalization of graphene nanoribbons for transport gap engineering

Alessandro Cresti, Alejandro Lopez-Bezanilla, Pablo Ordejón, Stephan Roche

Research output: Contribution to journalArticleResearchpeer-review

22 Citations (Scopus)

Abstract

We numerically investigate the impact of epoxide adsorbates on the transport properties of graphene nanoribbons with width varying from a few nanometers to 15 nm. For the wider ribbons, a scaling analysis of conductance properties is performed for adsorbate density ranging from 0.1% to 0.5%. Oxygen atoms introduce a large electron-hole transport asymmetry with mean free paths changing by up to 1 order of magnitude, depending on the hole or electron nature of charge carriers. The opening of a transport gap on the electron side for GNRs as wide as 15 nm could be further exploited to control current flow and achieve larger ON/OFF ratios, despite the initially small intrinsic energy gap. The effect of the adsorbates in narrow ribbons is also investigated by full ab initio calculations to explore the limit of ultimate downsized systems. In this case, the inhomogeneous distribution of adsorbates and their interplay with the ribbon edge are found to play an important role. © 2011 American Chemical Society.
Original languageEnglish
Pages (from-to)9271-9277
JournalACS Nano
Volume5
Issue number11
DOIs
Publication statusPublished - 22 Nov 2011

Keywords

  • functionalization
  • graphene nanoribbons
  • mobility gap
  • numerical simulation
  • quantum transport

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