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Title: Strain and structure heterogeneity in MoS 2 atomic layers grown by chemical vapour deposition

Monolayer molybdenum disulfide (MoS 2) 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 MoS 2 was discovered and, as a strong tool, was employed for strain and defect analysis in MoS 2. Recently, large-size monolayer MoS 2 has been produced by chemical vapor deposition but has not yet been fully explored. Here we systematically characterize chemical vapor deposition grown MoS 2 by PL spectroscopy and mapping, and demonstrate non-uniform strain in single-crystalline monolayer MoS 2 and strain-induced band gap engineering. We also evaluate the effective strain transferred from polymer substrates to MoS 2 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 MoS 2.
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:
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:
USDOE Laboratory Directed Research and Development (LDRD) Program; 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
OSTI Identifier:
1286749