Simple chemical routes to diamond-cubic germanium-tin alloys

Jennifer Taraci, John Tolle, John Kouvetakis, Martha McCartney, David Smith, Jose Menendez, M. A. Santana

Research output: Contribution to journalArticle

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Abstract

We report the development of a simple chemical route to growing Ge1-xSnx semiconductors using ultrahigh-vacuum chemical vapor deposition and the molecular precursor (Ph)SnD3 as the source of Sn atoms. Thin films were deposited on oxidized and oxide-free Si by reactions of (Ph)SnD3 with Ge2H6 at 350°C. The composition, microstructure, and bonding properties of the films were characterized by Rutherford backscattering, high-resolution analytical electron microscopy, and Raman spectroscopy. As-deposited Ge1-xSnx on oxidized Si displayed good crystallinity which improved significantly by annealing at 400°C. High-resolution electron microscopy and diffraction indicated a diamond-cubic structure with lattice constants intermediate to those of Ge and α-Sn. As-deposited Ge1-xSnx on pure Si was monocrystalline and epitaxial. Nanoprobe analysis in plan view and cross section revealed that the as-deposited and annealed materials were homogeneous with good chemical purity. The Raman spectra showed bands corresponding to Ge-Ge and Sn-Ge vibrations with frequencies consistent with a random tetrahedral alloy.

Original languageEnglish (US)
Pages (from-to)3607-3609
Number of pages3
JournalApplied Physics Letters
Volume78
Issue number23
DOIs
StatePublished - Jun 4 2001

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germanium alloys
tin alloys
electron microscopy
diamonds
routes
high resolution
ultrahigh vacuum
crystallinity
backscattering
purity
electron diffraction
Raman spectroscopy
vapor deposition
Raman spectra
vibration
microstructure
annealing
oxides
cross sections
thin films

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

Simple chemical routes to diamond-cubic germanium-tin alloys. / Taraci, Jennifer; Tolle, John; Kouvetakis, John; McCartney, Martha; Smith, David; Menendez, Jose; Santana, M. A.

In: Applied Physics Letters, Vol. 78, No. 23, 04.06.2001, p. 3607-3609.

Research output: Contribution to journalArticle

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