Deposition of Ge1-xCx alloy on Si by combined low-energy ion beam and molecular beam epitaxial method

Hajime Shibata, Shinji Kimura, Paul Fons, Akimasa Yamada, Akira Obara, Naoto Kobayashi

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6 Citations (Scopus)

Abstract

A combined ion beam and molecular beam epitaxial method was applied for the formation of a Ge1-xCx alloy on Si(100) using a low-energy (50-100 eV) C+ ion beam and a Ge molecular beam. Ge1-xCx alloys were formed up to x = 0.047. It was revealed that the sticking coefficients of C+ ions into Ge were approximately 53% and approximately 34% at the ion energies of 100 eV and 50 eV, respectively. This result suggests that the ratio of the number of ions recoiling at the surface of the substrate to the number of incident ions is higher for lower energy ions within the ion energy range examined. Characterization of crystal structure by X-ray diffraction suggests that the deposited films are single crystals grown epitaxially on the substrate with twins on {111} planes. Study of the C-1s chemical shift by X-ray photoelectron spectrometry in the sample of x = 0.047 revealed that the total composition of C atoms incorporated in substitutional and interstitial lattice sites is about 72%, while that of C atoms incorporated in the form of precipitate is about 28%. Lattice dynamical characterization by Raman spectroscopy suggests that the deposited layers have been damaged by ion irradiation.

Original languageEnglish
Pages (from-to)3459-3465
Number of pages7
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume38
Issue number6 A
Publication statusPublished - 1999 Jun
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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