Epitaxial graphene formation on 3C-SiC/Si thin films

Maki Suemitsu, Sai Jiao, Hirokazu Fukidome, Yasunori Tateno, Isao Makabe, Takashi Nakabayashi

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

By forming a thin 3C-SiC film on Si substrates and by annealing it at ∼1500 K in vacuo, few-layer graphene is formed epitaxially on Si substrates. In this graphene-on-silicon (GOS) technology, graphene grows at least on three major low-index Si surfaces: (1 1 1), (1 0 0) and (1 1 0), which allows tuning of structural and electronic properties of epitaxial graphene by simply controlling the crystallographic orientation of the surface. A typical example can be found in the two types of graphene formed on 3C-SiC(1 1 1) surfaces; the one on 3C-SiC(1 1 1)/Si(1 1 1) shows a Bernal stacking with an interfacial buffer layer, while the one on 3C-SiC(1 1 1)/Si(1 1 0) shows a non-Bernal stacking without an interfacial buffer layer. Inserting an AlN interlayer between Si and 3C-SiC significantly contributes to improvement of the GOS quality. Moreover, thanks to the sealing effect of the AlN layer against Si out-diffusion, we can apply chemomechanical polishing of SiC surface to reduce the surface roughness, which can further accentuate the effect of H2 annealing of the surface. As a result, a D to G band intensity ratio as low as 0.4 is obtained.

Original languageEnglish
Article number094016
JournalJournal of Physics D: Applied Physics
Volume47
Issue number9
DOIs
Publication statusPublished - 2014 Mar 5

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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