Surface and bulk equilibrium structures of silicon-germanium alloys from Monte Carlo simulations

Paul C. Weakliem, Emily A. Carter

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

The technologically important alloy of silicon and germanium is known to have no long-range order in the bulk. Whether there is any short-range order in the bulk and the nature of the structure of the surface and near-surface regions remains the subject of some debate. We present a method of Monte Carlo simulation that is effective for studying the equilibrium structural properties of the bulk and strained-superlattice alloys. The simulations of the bulk alloy indicate that there is no short-range order and that the Si-Ge alloy is a true random alloy at room temperature and above. The surfaces of these alloys experience segregation of germanium to the surface, with no long-range order observed in the slightly silicon-rich subsurface layers, in agreement with recent experiments.

Original languageEnglish (US)
Pages (from-to)13458-13464
Number of pages7
JournalPhysical Review B
Volume45
Issue number23
DOIs
StatePublished - Jan 1 1992
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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