Rotationally commensurate growth of MoS2 on epitaxial graphene

Xiaolong Liu, Itamar Balla, Hadallia Bergeron, Gavin P. Campbell, Michael J. Bedzyk, Mark C Hersam

Research output: Contribution to journalArticle

109 Citations (Scopus)

Abstract

Atomically thin MoS2/graphene heterostructures are promising candidates for nanoelectronic and optoelectronic technologies. Among different graphene substrates, epitaxial graphene (EG) on SiC provides several potential advantages for such heterostructures, including high electronic quality, tunable substrate coupling, wafer-scale processability, and crystalline ordering that can template commensurate growth. Exploiting these attributes, we demonstrate here the thicknesscontrolled van der Waals epitaxial growth of MoS2 on EG via chemical vapor deposition, giving rise to transfer-free synthesis of a twodimensional heterostructure with registry between its constituent materials. The rotational commensurability observed between the MoS2 and EG is driven by the energetically favorable alignment of their respective lattices and results in nearly strain-free MoS2, as evidenced by synchrotron X-ray scattering and atomicresolution scanning tunneling microscopy (STM). The electronic nature of the MoS2/EG heterostructure is elucidated with STM and scanning tunneling spectroscopy, which reveals bias-dependent apparent thickness, band bending, and a reduced band gap of ∼0.4 eV at the monolayer MoS2 edges.

Original languageEnglish
Pages (from-to)1067-1075
Number of pages9
JournalACS Nano
Volume10
Issue number1
DOIs
Publication statusPublished - Jan 26 2016

Keywords

  • Chemical vapor deposition
  • Scanning tunneling microscopy
  • Silicon carbide
  • Synchrotron X-ray scattering
  • Transition metal dichalcogenide
  • Van der Waals heterostructure

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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  • Cite this

    Liu, X., Balla, I., Bergeron, H., Campbell, G. P., Bedzyk, M. J., & Hersam, M. C. (2016). Rotationally commensurate growth of MoS2 on epitaxial graphene. ACS Nano, 10(1), 1067-1075. https://doi.org/10.1021/acsnano.5b06398