Initial stage of molecular adsorption on Si(100) and H-terminated Si(100) investigated by UHV-STM

Ken Nakajima, Tomihiro Hashizume, Seiji Heike, Satoshi Watanabe, Takayuki Ikehara, Yasuo Wada, Toshio Nishi

    研究成果: Article査読

    2 被引用数 (Scopus)

    抄録

    We have investigated the initial stage of adsorption of a conjugated aromatic compound, 1,4-bis[β-pyridyl-(2)-vinyl]benzene (P2VB), on the clean Si(100)-2 × 1 surface and the hydrogen terminated Si(100)-2 × 1-H surface by ultra-high-vacuum (UHV) scanning tunneling microscopy (STM). We found adsorbed molecules cannot migrate on the chemically active Si(100)-2 × 1 surface, while they can migrate on the chemically inactive hydrogen terminated Si(100)-2 × 1-H surface until they are trapped to hydrogen-missing dangling bonds. On the clean Si(100)-2 × 1, we observed four different adsorption directions. An individual molecule appears as two or three bright spots, the brightness and distance between bright spots varying for different cases. Through structural analysis and bias-voltage-dependent STM images, we conclude that the electronic states of Si dimers modulated by the adsorbed molecules are observed instead of the molecules themselves. A simple estimation by considering only the molecular size and shape reproduces the distribution of four different kinds of adsorption structures we observed.

    本文言語English
    ページ(範囲)71-76
    ページ数6
    ジャーナルScience Reports of the Rerearch Institutes Tohoku University Series A-Physics
    44
    1
    出版ステータスPublished - 1997 12 1

    ASJC Scopus subject areas

    • 凝縮系物理学
    • 金属および合金

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