Effects of Defects on Band Structure and Excitons in WS2 Revealed by Nanoscale Photoemission Spectroscopy

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DOI

  • Christoph Kastl, Lawrence Berkeley Natl Lab, United States Department of Energy (DOE), Lawrence Berkeley National Laboratory, Mol Foundry
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  • Roland J. Koch, Lawrence Berkeley Natl Lab, Lawrence Berkeley National Laboratory, United States Department of Energy (DOE), Adv Light Source
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  • Christopher T. Chen, Lawrence Berkeley Natl Lab, United States Department of Energy (DOE), Lawrence Berkeley National Laboratory, Mol Foundry
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  • Johanna Eichhorn, Lawrence Berkeley Natl Lab, Lawrence Berkeley National Laboratory, United States Department of Energy (DOE), Div Chem Sci
  • ,
  • Soren Ulstrup
  • Aaron Bostwick, Lawrence Berkeley Natl Lab, Lawrence Berkeley National Laboratory, United States Department of Energy (DOE), Adv Light Source
  • ,
  • Chris Jozwiak, Lawrence Berkeley Natl Lab, Lawrence Berkeley National Laboratory, United States Department of Energy (DOE), Adv Light Source
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  • Tevye R. Kuykendall, Lawrence Berkeley Natl Lab, United States Department of Energy (DOE), Lawrence Berkeley National Laboratory, Mol Foundry
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  • Nicholas J. Borys, Montana State Univ, Montana State University, Montana State University System, Montana State University Bozeman, Dept Phys
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  • Francesca M. Toma, Lawrence Berkeley Natl Lab, Lawrence Berkeley National Laboratory, United States Department of Energy (DOE), Div Chem Sci
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  • Shaul Aloni, Lawrence Berkeley Natl Lab, United States Department of Energy (DOE), Lawrence Berkeley National Laboratory, Mol Foundry
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  • Alexander Weber-Bargioni, Lawrence Berkeley Natl Lab, United States Department of Energy (DOE), Lawrence Berkeley National Laboratory, Mol Foundry
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  • Eli Rotenberg, Lawrence Berkeley Natl Lab, Lawrence Berkeley National Laboratory, United States Department of Energy (DOE), Adv Light Source
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  • Adam M. Schwartzberg, Lawrence Berkeley Natl Lab, United States Department of Energy (DOE), Lawrence Berkeley National Laboratory, Mol Foundry

Two-dimensional materials with engineered composition and structure will provide designer materials beyond conventional semiconductors. However, the potentials of defect engineering remain largely untapped, because it hinges on a precise understanding of electronic structure and excitonic properties, which are not yet predictable by theory alone. Here, we utilize correlative, nanoscale photoemission spectroscopy to visualize how local introduction of defects modifies electronic and excitonic properties of two-dimensional materials at the nanoscale. As a model system, we study chemical vapor deposition grown monolayer WS2, a prototypical, direct gap, two-dimensional semiconductor. By cross-correlating nanoscale angle-resolved photoemission spectroscopy, core level spectroscopy, and photoluminescence, we unravel how local variations in defect density influence electronic structure, lateral band alignment, and excitonic phenomena in synthetic WS2 monolayers.

Original languageEnglish
JournalACS Nano
Volume13
Issue2
Pages (from-to)1284-1291
Number of pages8
ISSN1936-0851
DOIs
Publication statusPublished - Feb 2019
Externally publishedYes

    Research areas

  • transition metal dichalcogenides, defects, photoemission spectroscopy, chemical vapor deposition, excitons, CATALYTIC-ACTIVITY, GRAIN-BOUNDARIES, LINE DEFECTS, MONOLAYER, GROWTH, MOS2, NANOSHEETS, WSE2

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