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Nano Research

, Volume 8, Issue 3, pp 1026–1037 | Cite as

Self-organized metal-semiconductor epitaxial graphene layer on off-axis 4H-SiC(0001)

  • Debora Pierucci
  • Haikel Sediri
  • Mahdi Hajlaoui
  • Emilio Velez-Fort
  • Yannick J. Dappe
  • Mathieu G. Silly
  • Rachid Belkhou
  • Abhay Shukla
  • Fausto Sirotti
  • Noelle Gogneau
  • Abdelkarim OuerghiEmail author
Research Article

Abstract

The remarkable properties of graphene have shown promise for new perspectives in future electronics, notably for nanometer scale devices. Here we grow graphene epitaxially on an off-axis 4H-SiC(0001) substrate and demonstrate the formation of periodic arrangement of monolayer graphene on planar (0001) terraces and Bernal bilayer graphene on \((11\bar 20)\) nanofacets of SiC. We investigate these lateral superlattices using Raman spectroscopy, atomic force microscopy/electrostatic force microscopy (AFM/EFM) and X-ray and angle resolved photoemission spectroscopy (XPS/ARPES). The correlation of EFM and ARPES reveals the appearance of permanent electronic band gaps in AB-stacked bilayer graphene on \((11\bar 20)\) SiC nanofacets of 150 meV. This feature is confirmed by density functional theory (DFT) calculations. The charge transfer between the substrate and graphene bilayer results in an asymmetric charge distribution between the top and the bottom graphene layers opening an energy gap. This surface organization can be thus defined as self-organized metal-semiconductor graphene.

Keywords

epitaxial graphene layer monolayer bilayer band gap opening Bernal stacking off-axis silicon carbide electronic properties 

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Copyright information

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Debora Pierucci
    • 1
  • Haikel Sediri
    • 1
  • Mahdi Hajlaoui
    • 1
    • 2
  • Emilio Velez-Fort
    • 1
    • 3
  • Yannick J. Dappe
    • 4
  • Mathieu G. Silly
    • 2
  • Rachid Belkhou
    • 2
  • Abhay Shukla
    • 3
  • Fausto Sirotti
    • 2
  • Noelle Gogneau
    • 1
  • Abdelkarim Ouerghi
    • 1
    Email author
  1. 1.CNRS-Laboratoire de Photonique et de NanostructuresMarcoussisFrance
  2. 2.Synchrotron-SOLEIL, Saint-AubinGif sur Yvette CedexFrance
  3. 3.Université Pierre et Marie Curie (CNRS - IMPMC)ParisFrance
  4. 4.Service de Physique de l’Etat Condensé (CNRS URA2464), IRAMISCEA SaclayGif-Sur-YvetteFrance

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