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The Relationship between InGaAs Channel Layer Thickness and Device Performance in High Electron Mobility Transistors

Published online by Cambridge University Press:  22 February 2011

M. Meshkinpour ,
M. S. Goorsky ,
D. C. Streit ,
T. Block ,
M. Wojtowicz ,
K. Rammohan  and
D. H. Rich
M. Meshkinpour
Affiliation:
University of California, Los Angeles, CA 90024
M. S. Goorsky
Affiliation:
University of California, Los Angeles, CA 90024
D. C. Streit
Affiliation:
TRW, Redondo Beach, CA 90278
T. Block
Affiliation:
TRW, Redondo Beach, CA 90278
M. Wojtowicz
Affiliation:
TRW, Redondo Beach, CA 90278
K. Rammohan
Affiliation:
University of Southern California, Los Angeles, CA 90089
D. H. Rich
Affiliation:
University of Southern California, Los Angeles, CA 90089
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Abstract

The performance of InGaAs/GaAs pseudomorphic high electron mobility transistors is anticipated to improve with increased channel thickness due to reduced effects of quantum confinement. However, greater channel thicknesses increase the probability of forming misfit dislocations which have been reported to impair device properties. We characterized the composition and thickness of the active layer in Al0.25Ga0.75As / In0.21Ga0.79As structures with different channel thicknesses (75 Å - 300 Å) to within ± 0.005 and ± 8 Å using high resolution x-ray techniques. We determined, using Hall and rf measurements, that the device properties of these structures improved with increasing thickness up to about 185-205 Å; degraded properties were observed for thicker channel layers. Cathodoluminescence results indicate that the mosaic spread observed in x-ray triple axis rocking curves of these device structures is due to the presence of misfit dislocations. Thus, even though misfit dislocations are present, the device structure performs best with a channel thickness of ∼185 Å. These results demonstrate that one can fabricate functional devices in excess of critical thickness considerations, and that these x-ray techniques provide an effective means to evaluate structural properties prior to device processing.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 340: Symposium E – Compound Semiconductor Epitaxy , 1994 , 327
Copyright
Copyright © Materials Research Society 1994

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References

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