角度分解光電子分光による金属/酸化物界面の研究 : Cu吸着ZnO極性表面の価電子バンド構造 Angle-Resolved Photoemission Spectroscopy Study of Metal/Oxide Interface : Valence Band Structure of Cu Adsorbed Polar ZnO Surfaces

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Angle-resolved photoemission measurements are carried out to investigate the valence electronic structures of two different ZnO surfaces that are (0001) Zn-terminated (ZnO-Zn) and (000-1) O-terminated (ZnO-O) surfaces, and also of Cu clusters supported on these surfaces. On the clean ZnO surfaces, two valence bands are observed at ∼4 and 5−8 eV with a clear dispersion feature. Although these bands are associated with the bulk bands, it is found that the dispersion widths of the bands exhibit the termination dependence of the polar ZnO surfaces. Deposition of Cu on the polar ZnO surfaces induces downward bending of the ZnO band. Magnitude of Cu-induced bending is larger on ZnO-O than on ZnO-Zn. This indicates that the Cu—ZnO interface interaction is greater for the Cu/ZnO-O system than for the Cu/ZnO-Zn system. The analysis of the Cu 3d band structure implies that coupling between the Cu 3d band and the ZnO band is operative at the Cu—ZnO-O interface, whereas such coupling seems to be missing at the Cu—ZnO-Zn interface. We propose that the effect of electronic coupling is one of the factors that determine the interface interaction between the Cu cluster and polar ZnO surfaces.

収録刊行物

  • 表面科学 = Journal of The Surface Science Society of Japan

    表面科学 = Journal of The Surface Science Society of Japan 29(7), 407-412, 2008-07-10

    The Surface Science Society of Japan

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各種コード

  • NII論文ID(NAID)
    10021166518
  • NII書誌ID(NCID)
    AN00334149
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    03885321
  • NDL 記事登録ID
    9576473
  • NDL 雑誌分類
    ZM35(科学技術--物理学)
  • NDL 請求記号
    Z15-379
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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