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Layer Tilt and Relaxation in InGaAs/GaAs Graded Buffer Layers

Published online by Cambridge University Press:  15 February 2011

K.M. Matney ,
J.W. Eldredge  and
M.S. Goorsky
K.M. Matney
Affiliation:
University of California, Los Angeles, CA 90095-1595
J.W. Eldredge
Affiliation:
University of California, Los Angeles, CA 90095-1595
M.S. Goorsky
Affiliation:
University of California, Los Angeles, CA 90095-1595
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Abstract

We investigated the effect of substrate inclination and direction on the structural properties of an InGaAs linearly compositionally graded buffer layer with a AlGaAs/InGaAs superlattice grown by molecular beam epitaxy on 2° offcut GaAs substrates. Reciprocal space maps were used to determine the relaxation and tilt of the buffer layer and superlattice with respect to each other and to the substrate. From (004) reciprocal space maps, a linear relationship between tilt and In mole fraction was observed for the buffer layer. This tilt was greatly reduced near the top of the buffer which was found to be completely strained. Interestingly, the tilt along a <110> direction was greater than that observed along the miscut axis. This may be due to the miscut axis not being parallel to a low index plane. Reciprocal space maps of asymmetric diffraction planes were used to determine the relaxation of the buffer layer as a function of In mole fraction. Along a <110> direction in which no tilt was seen in the (004), the majority of the buffer layer was found to be completely relaxed. However, the top of the buffer layer was found to be completely strained, corresponding to a denuded zone observed in cross section transmission electron microscopy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 379: Symposium C – Strained Layer Epitaxy–Materials, Processing, and Devise Applications , 1995 , 73
Copyright
Copyright © Materials Research Society 1995

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References

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