Structures of 6H-SiC surfaces

L. Li, Y. Hasegawa, I. S.T. Tsong, T. Sakurai

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    We have systematically studied reconstructions of the 6H SiC(0001) and (000 1) surface under both Si rich and C rich condition using field ion-scanning tunneling microscopy (FI-STM). The sample was cleaned by in situ Si beam etching at 900-1000°C. The Si rich and C rich phases were produced by annealing the sample in a Si flux and C2H2, respectively. On the (0001) surface, the as-cleaned surface showed (√3x√3) reconstruction. With increasing Si concentration, (2x2), (2√3x6√3), (3x3), and (7x7) reconstructions were observed. Reaction of the Si rich phases with C2H2 molecule at 1050°C resulted in the formation of C rich surface, which exhibited (2x2)/(6x6) reconstruction. On the (000 1) surface, (2√3x2√3) reconstruction was observed after cleaning. Under Si rich condition, (2x2), (3x3), and (7x7) reconstructions were observed. Annealing the surface in C2H2 beam at 1050°C led to C rich phase with (1x1) structure. Structure model for (√3x√3) and (2√3x2√3) reconstruction are proposed, and possible applications of using the surface reconstruction to selectively grow the polytype SiC is discussed.

    Original languageEnglish
    Pages (from-to)C5-167-C5-172
    JournalJournal De Physique. IV : JP
    Issue number5
    Publication statusPublished - 1996 Dec 1

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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    Li, L., Hasegawa, Y., Tsong, I. S. T., & Sakurai, T. (1996). Structures of 6H-SiC surfaces. Journal De Physique. IV : JP, 6(5), C5-167-C5-172.