Electron Properties of Alkali Metal/Silicon Interfaces: a New Picture

Adsorption of Na and Cs on the Si(100)2 x 1 surface in the monolayer range is investigated by core level and valence band photoemission spectroscopy using synchrotron radiation. The alkali metals are found to induce an electronic interface state near the Fermi level while hybridization between alkal...

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Bibliographic Details
Published inSurface science Vol. 221; no. 3; pp. L759 - L678
Main Authors Soukiassian, P, Bakshi, M H, Hurych, Z, Gentle, T M
Format Journal Article
LanguageEnglish
Published 01.11.1989
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Summary:Adsorption of Na and Cs on the Si(100)2 x 1 surface in the monolayer range is investigated by core level and valence band photoemission spectroscopy using synchrotron radiation. The alkali metals are found to induce an electronic interface state near the Fermi level while hybridization between alkali adsorbate "s" and silicon substrate "3p" valence electrons occurs. These results provide evidence that the alkali metal/silicon bonding is covalent. This covalent bond is weak and polarized while plasmon at the alkali metal core level indicates adsorbate rather then substrate metallization. 28 ref.--AA
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ISSN:0039-6028