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Title: Strain and structure heterogeneity in MoS2 atomic layers grown by chemical vapour deposition

Monolayer molybdenum disulfide (MoS2) has attracted tremendous attention due to its promising applications in high-performance field-effect transistors, phototransistors, spintronic devices, and nonlinear optics. The enhanced photoluminescence effect in monolayer MoS2 was discovered and, as a strong tool, was employed for strain and defect analysis in MoS2. Recently, large-size monolayer MoS2 has been produced by chemical vapor deposition but has not yet been fully explored. Here we systematically characterize chemical vapor deposition grown MoS2 by PL spectroscopy and mapping, and demonstrate non-uniform strain in single-crystalline monolayer MoS2 and strain-induced band gap engineering. We also evaluate the effective strain transferred from polymer substrates to MoS2 by three-dimensional finite element analysis. In addition, our work demonstrates that PL mapping can be used as a non-contact approach for quick identification of grain boundaries in MoS2.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [3] ;  [5] ;  [1] ;  [1] ;  [2] ;  [2] ;  [3] ;  [3] ;  [6] ;  [2] ;  [3] ;  [3]
  1. Nanyang Technological Univ. (Singapore)
  2. US Army Research Lab., Adelphi, MD (United States)
  3. Rice Univ., Houston, TX (United States)
  4. Univ. of North Texas, Denton, TX (United States); China Univ. of Petroleum, Beijing (China)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
  6. Univ. of North Texas, Denton, TX (United States)
Publication Date:
OSTI Identifier:
1286749
Grant/Contract Number:
AC05-00OR22725; S201006; CNS-0821727; OCI-0959097; NRF-RF2013-08
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 5; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Org:
ORNL LDRD Director's R&D; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE Monolayer ​molybdenum disulfide; (​MoS2); chemical vapour deposition; photoluminescence mapping