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

Ryo Kadowaki, Naoki Sano, Tadashi Abukawa

研究成果: Article査読

5 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)115-120
ページ数6
ジャーナルe-Journal of Surface Science and Nanotechnology
15
DOI
出版ステータスPublished - 2017 11 11

ASJC Scopus subject areas

  • バイオテクノロジー
  • バイオエンジニアリング
  • 凝縮系物理学
  • 材料力学
  • 表面および界面
  • 表面、皮膜および薄膜

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