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Quaternary Alloys InxAlyGa1−x-yAs Grown on GaAs with A Compositionally-Step-Graded Buffer

Published online by Cambridge University Press:  25 February 2011

C. Fan ,
D. W. Shih ,
M. W. Hansen ,
J. Chen ,
P. Z. Lee  and
S. C. Esener
C. Fan
Affiliation:
University of California, San Diego, La Jolla, CA 92093-0407
D. W. Shih
Affiliation:
University of California, San Diego, La Jolla, CA 92093-0407
M. W. Hansen
Affiliation:
University of California, San Diego, La Jolla, CA 92093-0407
J. Chen
Affiliation:
University of California, San Diego, La Jolla, CA 92093-0407
P. Z. Lee
Affiliation:
University of California, San Diego, La Jolla, CA 92093-0407
S. C. Esener
Affiliation:
University of California, San Diego, La Jolla, CA 92093-0407
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Abstract

Fundamental bandgaps and Schottky barrier heights of strain-relaxed quaternary InxAlyGa1−x-yAs alloys with 0 < x < 0.35 and 0 < y < 0.30 were studied. The alloys were grown on GaAs substrates by molecular beam epitaxy. The lattice mismatch (up to 2.5%) and mismatch strain were accommodated by a compositionally-step-graded buffer. A residual compressive strain of less than 0.5% was determined by x-ray diffraction. Measured Schottky barrier heights v.s. bandgap deviate from the values predicted by the “commonanion” rule. This behavior is attributed to the compositional inhomogeneities and chemical reactivity of the air-exposed InAlGaAs surfaces.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 263: Symposium F – Mechanisms of Heteroepitaxial Growth , 1992 , 451
Copyright
Copyright © Materials Research Society 1992

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