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

doi:10.1038/nmat3633

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

Department of Materials Science and Engineering

Research output: Contribution to journal › Article

1286 Citations (Scopus)

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 language	English
Pages (from-to)	554-561
Number of pages	8
Journal	Nature materials
Volume	12
Issue number	6
DOIs	https://doi.org/10.1038/nmat3633
Publication status	Published - 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

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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.",

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Grains and grain boundaries in highly crystalline monolayer molybdenum disulphide. / Van Der Zande, Arend M.; Huang, Pinshane Y.; Chenet, Daniel A.; Berkelbach, Timothy C.; You, Yumeng; Lee, Gwan Hyoung; Heinz, Tony F.; Reichman, David R.; Muller, David A.; Hone, James C.

In: Nature materials, Vol. 12, No. 6, 01.06.2013, p. 554-561.

Research output: Contribution to journal › Article

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