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Title: Rapid, all-optical crystal orientation imaging of two-dimensional transition metal dichalcogenide monolayers

Two-dimensional (2D) atomic materials such as graphene and transition metal dichalcogenides (TMDCs) have attracted significant research and industrial interest for their electronic, optical, mechanical, and thermal properties. While large-area crystal growth techniques such as chemical vapor deposition have been demonstrated, the presence of grain boundaries and orientation of grains arising in such growths substantially affect the physical properties of the materials. There is currently no scalable characterization method for determining these boundaries and orientations over a large sample area. We here present a second-harmonic generation based microscopy technique for rapidly mapping grain orientations and boundaries of 2D TMDCs. We experimentally demonstrate the capability to map large samples to an angular resolution of ±1° with minimal sample preparation and without involved analysis. A direct comparison of the all-optical grain orientation maps against results obtained by diffraction-filtered dark-field transmission electron microscopy plus selected-area electron diffraction on identical TMDC samples is provided. This rapid and accurate tool should enable large-area characterization of TMDC samples for expedited studies of grain boundary effects and the efficient characterization of industrial-scale production techniques.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ; ;  [3] ;  [5] ;  [7] ;  [4] ;  [1] ;  [4]
  1. Materials Science and Engineering Program, University of Colorado, Boulder, Colorado 80309 (United States)
  2. Department of Mechanical Engineering, University of Colorado, Boulder, Colorado 80309 (United States)
  3. Department of Mechanical Engineering, Columbia University, New York, New York 10027 (United States)
  4. (United States)
  5. NSF Nanoscale Science and Engineering Center (NSEC), University of California, Berkeley 3112 Etcheverry Hall, UC Berkeley, California 94720 (United States)
  6. Department of Mechanical Science and Engineering, University of Illinois, Urbana, Illinois 61801 (United States)
  7. (Saudi Arabia)
Publication Date:
OSTI Identifier:
22482076
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CHEMICAL VAPOR DEPOSITION; ELECTRON DIFFRACTION; GRAIN BOUNDARIES; GRAIN ORIENTATION; GRAPHENE; RESOLUTION; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENTS; TRANSMISSION ELECTRON MICROSCOPY; TWO-DIMENSIONAL SYSTEMS