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Surface Phase Separation and Ordering in Compound Semiconductor Alloys

Published online by Cambridge University Press:  28 February 2011

T.L. Mcdevitt ,
S. Mahajan ,
D.E. Laughlin ,
W.A. Bonner  and
V.G. Keramidas
T.L. Mcdevitt
Affiliation:
Department of Metallurgical Engineering and Materials Science Carnegie Mellon University, Pittsburgh, PA 15213
S. Mahajan
Affiliation:
Department of Metallurgical Engineering and Materials Science Carnegie Mellon University, Pittsburgh, PA 15213
D.E. Laughlin
Affiliation:
Department of Metallurgical Engineering and Materials Science Carnegie Mellon University, Pittsburgh, PA 15213
W.A. Bonner
Affiliation:
Bellcore Red Bank, NJ 07701
V.G. Keramidas
Affiliation:
Bellcore Red Bank, NJ 07701
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Abstract

The orientation dependence of phase separation has been examined in detail in InGaAsP layers grown by liquid phase epitaxy on (001), (110), (111)In and (123) InP substrates. It is shown that phase separation is two-dimensional in nature and does not occur along the growth direction for the cases examined. Further, phase separation takes place along the soft directions lying in the growth plane. These results very strongly suggest that phase separation evolves at the surface while the layer is growing.

CuPt-type ordering characteristics of InGaAsP layers are presented. In addition, the Influence of growth temperature and growth rate on domain sizes have been investigated in GaInP2 layers. A model has been proposed to rationalize the formation of domains and involves steps present on the surface. Results suggest that ordering like phase separation occurs at the surface while the layers is being deposited. It is inferred that the two microstructural features evolve concomitantly at the surface during layer growth.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 198: Symposium V – Epitaxial Heterostructures , 1990 , 609
Copyright
Copyright © Materials Research Society 1990

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References

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