Grains and grain boundaries in highly crystalline monolayer molybdenum disulphide

Arend M. Van Der Zande, Pinshane Y. Huang, Daniel A. Chenet, Timothy C. Berkelbach, Yumeng You, Gwan Hyoung Lee, Tony F. Heinz, David R. Reichman, David A. Muller, James C. Hone

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Abstract

Recent progress in large-area synthesis of monolayer molybdenum disulphide, a new two-dimensional direct-bandgap semiconductor, is paving the way for applications in atomically thin electronics. Little is known, however, about the microstructure of this material. Here we have refined chemical vapour deposition synthesis to grow highly crystalline islands of monolayer molybdenum disulphide up to 120 μm in size with optical and electrical properties comparable or superior to exfoliated samples. Using transmission electron microscopy, we correlate lattice orientation, edge morphology and crystallinity with island shape to demonstrate that triangular islands are single crystals. The crystals merge to form faceted tilt and mirror twin boundaries that are stitched together by lines of 8- and 4-membered rings. Density functional theory reveals localized mid-gap states arising from these 8-4 defects. We find that mirror twin boundaries cause strong photoluminescence quenching whereas tilt boundaries cause strong enhancement. Meanwhile, mirror twin boundaries slightly increase the measured in-plane electrical conductivity, whereas tilt boundaries slightly decrease the conductivity.

Original languageEnglish
Pages (from-to)554-561
Number of pages8
JournalNature materials
Volume12
Issue number6
DOIs
Publication statusPublished - 2013 Jun 1

All Science Journal Classification (ASJC) codes

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

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    Van Der Zande, A. M., Huang, P. Y., Chenet, D. A., Berkelbach, T. C., You, Y., Lee, G. H., Heinz, T. F., Reichman, D. R., Muller, D. A., & Hone, J. C. (2013). Grains and grain boundaries in highly crystalline monolayer molybdenum disulphide. Nature materials, 12(6), 554-561. https://doi.org/10.1038/nmat3633