Effect of surface polarity on gallium adsorption on 6H-SiC(0001) surfaces: An STM study

Craig Tindall, Lian Li, Yukio Hasegawa, Toshio Sakurai

Research output: Contribution to journalArticlepeer-review

Abstract

We have performed the first STM study of gallium adsorption on both the Si and C terminated 6H-SiC(0001) surfaces. The development of surface structures was followed as a function Ga coverage. On both the Si-terminated √3 x √3 and C-terminated 2√3 x 2√3 surfaces, coverages of less than 1/2 ML resulted in a disordered phase. Increasing the coverage to greater than 1/2, but less than 1 ML produced ordered phases. On the Si-terminated side this consisted of parallel rows of Ga atoms arranged in three different domains, oriented at angles of 120 degrees with respect to each other. Thus the surface symmetry was reduced from three-fold to two-fold. On the C-terminated side, it consisted of interlocking rings of 12 atoms, which appear alternately bright and dark in the STM image. Thus the original threefold symmetry of the SiC surface was preserved. On both surfaces, full monolayer coverage led to the formation of the (1 x 1)Ga structure.

Original languageEnglish
Pages (from-to)95-98
Number of pages4
JournalScience Reports of the Rerearch Institutes Tohoku University Series A-Physics
Volume44
Issue number1
Publication statusPublished - 1997
Externally publishedYes

Keywords

  • Adsorption
  • Ga
  • SiC
  • Surface structure, STM

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Metals and Alloys

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