Intrinsic structural defects in monolayer molybdenum disulfide

Wu Zhou*, Xiaolong Zou, Sina Najmaei, Zheng Liu, Yumeng Shi, Jing Kong, Jun Lou, Pulickel M. Ajayan, Boris I. Yakobson, Juan Carlos Idrobo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1304 Scopus citations

Abstract

Monolayer molybdenum disulfide (MoS2) is a two-dimensional direct band gap semiconductor with unique mechanical, electronic, optical, and chemical properties that can be utilized for novel nanoelectronics and optoelectronics devices. The performance of these devices strongly depends on the quality and defect morphology of the MoS2 layers. Here we provide a systematic study of intrinsic structural defects in chemical vapor phase grown monolayer MoS2, including point defects, dislocations, grain boundaries, and edges, via direct atomic resolution imaging, and explore their energy landscape and electronic properties using first-principles calculations. A rich variety of point defects and dislocation cores, distinct from those present in graphene, were observed in MoS2. We discover that one-dimensional metallic wires can be created via two different types of 60 grain boundaries consisting of distinct 4-fold ring chains. A new type of edge reconstruction, representing a transition state during growth, was also identified, providing insights into the material growth mechanism. The atomic scale study of structural defects presented here brings new opportunities to tailor the properties of MoS2 via controlled synthesis and defect engineering.

Original languageEnglish (US)
Pages (from-to)2615-2622
Number of pages8
JournalNano Letters
Volume13
Issue number6
DOIs
StatePublished - Jun 12 2013

Keywords

  • Monolayer molybdenum sulfide
  • atomic resolution imaging
  • dislocation
  • edge reconstruction
  • first-principles calculations
  • grain boundary
  • point defects

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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