Characterization of epitaxial MgO growth on Si(001) surface

Tadashi Abukawa, Shunsuke Sato, Youta Matsuoka

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11 Citations (Scopus)

Abstract

MgO epitaxial growth on a Si(001) surface by ultrahigh-vacuum molecular beam epitaxy was investigated. Epitaxial orientation and crystalline quality were characterized based on the three-dimensional reciprocal map obtained by Weissenberg RHEED. The epitaxial orientation and crystallinity were strongly dependent on the initial condition of the substrate. When MgO was deposited on a clean Si(001) surface at room temperature a MgO(001) film grew on the Si(001) substrate with two in-plane orientations:MgO[110]//Si[100] and MgO[100]//Si[100]. This is the first observation of MgO epitaxy with the former orientation, which has a smaller mismatch than the latter orientation. When the substrate was exposed to O2 or thermally oxidized, the latterorientation predominantly grew on the substrate. Deposition of Mg on the substrate also produced the latter orientation. These results imply that nucleation sites on the initial substrate play an important role in determining the epitaxial orientation.

Original languageEnglish
Pages (from-to)1614-1618
Number of pages5
JournalSurface Science
Volume604
Issue number19-20
DOIs
Publication statusPublished - 2010 Sep 1

Keywords

  • MgO
  • RHEED
  • Semiconductor-insulator interfaces
  • Si(001)
  • Single crystal epitaxy

ASJC Scopus subject areas

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

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