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The Influence of Surfactants on the Growth of Germanium Layers on Silicon Surfaces by MBE

Published online by Cambridge University Press:  25 February 2011

H.J. Osten ,
J. Klatt ,
G. Lippert ,
E. Bugiel  and
B. Dietrich
H.J. Osten
Affiliation:
Institute of Semiconductor Physics, W.-Korsing-Str. 2 O-1200 Frankfurt(Oder), Germany
J. Klatt
Affiliation:
Institute of Semiconductor Physics, W.-Korsing-Str. 2 O-1200 Frankfurt(Oder), Germany
G. Lippert
Affiliation:
Institute of Semiconductor Physics, W.-Korsing-Str. 2 O-1200 Frankfurt(Oder), Germany
E. Bugiel
Affiliation:
Institute of Semiconductor Physics, W.-Korsing-Str. 2 O-1200 Frankfurt(Oder), Germany
B. Dietrich
Affiliation:
Institute of Semiconductor Physics, W.-Korsing-Str. 2 O-1200 Frankfurt(Oder), Germany
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Abstract

Deliberate introduction of a surfactant can drastically influence the growth mode of germanium on silicon. Without a surfactant germanium growth proceeds in a typical Stranski-Krastanov mode. The system is minimizing its built-in energy by undergoing strain relaxation through a clustering mechanism (islanding). In all surfactant-mediated growth processes it was possible to obtain smooth layers without island formation. The influence of different ways for introducing the surfactant layer (at the interface between substrate and growing film, in the growing film below the critical Stranski-Krastanov thickness, or on top of the grown Ge film) will be presented. Especially in surfactant-controlled solid phase epitaxy (SPE) the smooth epitaxial germanium layer was obtained by passing through an island formation stage. These islands formed below 400 °C are of different structure than the ones formed without a surfactant. Possible mechanism for the “smoothing out” of islands developed in the beginning stage of surfactant-controlled SPE will be proposed. The island formation stage can be completely suppressed by depositing the surfactant on top of the amorphous Ge layer before increasing the temperature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 263: Symposium F – Mechanisms of Heteroepitaxial Growth , 1992 , 17
Copyright
Copyright © Materials Research Society 1992

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References

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