Arsenic termination of the Si(110) surface

D. K. Biegelsen, R. D. Bringans, J. E. Northrup, M. C. Schabel, L. E. Swartz

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


Si(100) and Si(111) surfaces both have singly occupied dangling bonds in their lowest-energy configurations. A single monolayer of arsenic has been shown to passivate the surfaces and lead to simple, nearly ideal (2×1) and (1×1) reconstructions, respectively. The bare Si(110) surface also has a complex reconstruction and high surface free energy. As presented here it can be shown theoretically that termination of Si(110) with a monolayer of As lowers the free energy of the ideal surface by 1.1 eV/(As atom). We would therefore expect that As adsorption would again lead to a topographically simple passivated structure. Using x-ray-photoemission spectroscopy, low-energy electron diffraction, and scanning tunneling microscopy we show here that, to the contrary, the Si(110):As surface, in fact consists of 2/3 monolayer of As in a two-dimensional corrugated unit cell with real-space unit vectors 5± and 3±+3, where ±=[001] and =1/2[110]. We propose a model for the surface which consists only of fourfold-coordinated Si atoms and threefold-coordinated As atoms.

Original languageEnglish (US)
Pages (from-to)9589-9596
Number of pages8
JournalPhysical Review B
Issue number15
StatePublished - 1993
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics


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