PEEM and micro-UPS studies of cleaved and exfoliated molybdenum disulfide surfaces

Ryo Kadowaki, Naoki Sano, Tadashi Abukawa

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Thin films of molybdenum disulfide (MoS2) are generally exfoliated from a mineral crystal. Impurities and contaminants of mineral origin may spoil the expected functions of MoS2 thin-film devices because they have a strong influence on the properties of the exfoliated films. The effects of surface contaminants on cleaved or exfoliated MoS2 surfaces were investigated using photoemission electron microscopy and selected-area ultraviolet photoelec-tron spectroscopy under several exfoliation conditions. The chemical composition and crystallinity of surfaces were also investigated using Auger electron spectroscopy and electron diffraction. The bulk crystal included a limited number of contaminated interfaces, at which the crystal was easily cleaved. Therefore, repeated exfoliations are required to expose a clean surface for exfoliated films. Annealing at ca. 400◦C in a vacuum was effective to reduce contamination of the cleaved MoS2 surface.

Original languageEnglish
Pages (from-to)115-120
Number of pages6
Journale-Journal of Surface Science and Nanotechnology
Publication statusPublished - 2017 Nov 11


  • Layered materials
  • Molybdenum-disulfide
  • Photoemission
  • Photoemission electron microscopy (PEEM)
  • Work function

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Condensed Matter Physics
  • Mechanics of Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


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