Structural and vibrational properties of 6H-SiC(0001) surfaces studied using STM/HREELS

L. Li, C. Tindall, O. Takaoka, Y. Hasegawa, Toshio Sakurai

    Research output: Contribution to journalArticle

    14 Citations (Scopus)

    Abstract

    The structural and vibrational properties of the 6H-SiC(0001) surface have been investigated using a combined scanning tunneling microscopy (STM)/high resolution electron energy loss spectroscopy (HREELS) system. The STM was used to study the structure of the (√3 × √3) surface. The STM images of this surface exhibited contrast reversal between the filled and empty state images, which is inconsistent with previously proposed adatom models. In addition, the HREELS data shows no indication of H on the (√3 × √3) surface. Based on this and recent photoemission data, we propose a surface vacancy model for the (√3 × √3) surface. We have also performed the first study of the surface phonons of clean, well characterized SiC surface structures using HREELS. In order to confirm that the near surface structure and stoichiometry has no effect on the frequency of the Fuchs-Kleiwer (FK) phonon we prepared clean (√3 × √3) and (3 × 3) surfaces. These two surface phases have very different structures and stoichiometry. The FK phonon frequency was the same on both surfaces. Thus, we verified that the assumption made in previous studies is valid. Moreover, we found that the adsorption of 0.3 monolayers of oxygen also causes no change in the phonon frequency.

    Original languageEnglish
    Pages (from-to)60-65
    Number of pages6
    JournalSurface Science
    Volume385
    Issue number1
    DOIs
    Publication statusPublished - 1997 Aug 1

    Keywords

    • Chemisorption
    • Electron energy loss spectroscopy
    • Low index single crystal surfaces
    • Scanning tunneling microscopy
    • Silicon carbide
    • Surface phonons
    • Surface structure

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Surfaces and Interfaces
    • Surfaces, Coatings and Films
    • Materials Chemistry

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