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Si1-xGex Critical Thickness for Surface Wave Generation During UHV-CVD Growth at 525°C

Published online by Cambridge University Press:  21 February 2011

H. Lafontaine
Affiliation:
Institute for Microstructural Sciences, National Research Council, Ottawa, K1A OR6 Canada
D.C. Houghton
Affiliation:
Institute for Microstructural Sciences, National Research Council, Ottawa, K1A OR6 Canada
B. Bahierathan
Affiliation:
Department of Metallurgy, University of Toronto, 184 College St., Toronto, M5S 3E4 Canada
D.D. Perovic
Affiliation:
Department of Metallurgy, University of Toronto, 184 College St., Toronto, M5S 3E4 Canada
J.-M. Baribeau
Affiliation:
Institute for Microstructural Sciences, National Research Council, Ottawa, K1A OR6 Canada
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Abstract

Several Si1-xGex/Si heterostructures were grown at 525°C using a commercially available UHV-CVD reactor. Layers with a germanium fraction ranging from 0.15 to 0.5 were examined by means of cross-sectional transmission electron microscopy and atomic force microscopy. Surface waves were found in layers with a thickness above a critical value which decreases rapidly as the Ge fraction is increased. Both experimental and modeling results show that surface waves are generated before misfit dislocations for Ge fractions above 0.3.

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