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 | |
| Publication status | Published - 2013 Jun 1 |
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All Science Journal Classification (ASJC) codes
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
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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
TY - JOUR
T1 - Grains and grain boundaries in highly crystalline monolayer molybdenum disulphide
AU - Van Der Zande, Arend M.
AU - Huang, Pinshane Y.
AU - Chenet, Daniel A.
AU - Berkelbach, Timothy C.
AU - You, Yumeng
AU - Lee, Gwan Hyoung
AU - Heinz, Tony F.
AU - Reichman, David R.
AU - Muller, David A.
AU - Hone, James C.
PY - 2013/6/1
Y1 - 2013/6/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84878237613&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84878237613&partnerID=8YFLogxK
U2 - 10.1038/nmat3633
DO - 10.1038/nmat3633
M3 - Article
C2 - 23644523
AN - SCOPUS:84878237613
VL - 12
SP - 554
EP - 561
JO - Nature Materials
JF - Nature Materials
SN - 1476-1122
IS - 6
ER -