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High Magnetic Field Studies of AlGaN/GaN Heterostructures Grown on Bulk GaN, SiC, and Sapphire Substrates

Published online by Cambridge University Press:  17 March 2011

W. Knap ,
E. Borovitskaya ,
M. S. Shur ,
R. Gaska ,
G. Karczewski ,
B. Brandt ,
D. Maude ,
E. Frayssinet ,
P. Lorenzini  and
N. Grandjean
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W. Knap
Affiliation:
Rensselaer Polytechnic Institute, Troy, NY 12180, USA GES- CNRS-Universite Montpellier2 UMR5650 Montpellier, France
E. Borovitskaya
Affiliation:
Rensselaer Polytechnic Institute, Troy, NY 12180, USA
M. S. Shur
Affiliation:
Rensselaer Polytechnic Institute, Troy, NY 12180, USA
R. Gaska
Affiliation:
Rensselaer Polytechnic Institute, Troy, NY 12180, USA Sensor Electronic Technology, Latham, NY 12110, USA
G. Karczewski
Affiliation:
NHMFL/ Florida State University, Tallahassee, USA
B. Brandt
Affiliation:
NHMFL/ Florida State University, Tallahassee, USA
D. Maude
Affiliation:
Grenoble High Magnetic Field Laboratory, Grenoble, France
E. Frayssinet
Affiliation:
CNRS – CRHEA, Valbonne, France
P. Lorenzini
Affiliation:
CNRS – CRHEA, Valbonne, France
N. Grandjean
Affiliation:
CNRS – CRHEA, Valbonne, France
J. Massies
Affiliation:
CNRS – CRHEA, Valbonne, France
J. W. Yang
Affiliation:
University of South Carolina, Columbia, USA
X. Hu
Affiliation:
University of South Carolina, Columbia, USA
G. Simin
Affiliation:
University of South Carolina, Columbia, USA
M. Asif Khan
Affiliation:
University of South Carolina, Columbia, USA
C. Skierbiszewski
Affiliation:
High Pressure Research Center, UNIPRESS, Warsaw, Poland
P. Prystawko
Affiliation:
High Pressure Research Center, UNIPRESS, Warsaw, Poland
I. Grzegory
Affiliation:
High Pressure Research Center, UNIPRESS, Warsaw, Poland
S. Porowski
Affiliation:
High Pressure Research Center, UNIPRESS, Warsaw, Poland
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Abstract

We present the results of the high magnetic field studies of properties of two-dimensional electron gas (2DEG) in AlGaN/GaN heterostructures grown over high-pressure bulk GaN, sapphire, and insulating SiC substrates. The experimental results include the low field Hall measurements, cyclotron resonance measurements, and cryogenic temperature Quantum Hall Effect studies as well as room-temperature characteristics of High Electron Mobility Transistors fabricated on all these substrates. The room temperature high field measurements allow us to clearly separate the contributions of a parasitic parallel conduction from 2DEG conduction in all investigated heterostructures.

The magnetotransport measurements are performed in the magnetic fields up to 30 Tesla for temperatures between 50mK-300K. This high magnetic field in combination with very high mobilities (over 60.000 cm2/Vs) in the sample on the bulk GaN substrates allow us to observe features related both to cyclotron resonance and spin splitting. The temperature dependence of this splitting determines the spin and cyclotron resonance energy gaps and, in combination with cyclotron resonance and tilted field experiments, allows us to determine the complete energy structure of 2DEG conduction band. We also present the first experimental results showing so called “the exchange enhancement” of the energy gaps between spin Landau levels.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 639: Symposium G – GaN and Related Alloys-2000 , 2000 , G7.3
Copyright
Copyright © Materials Research Society 2001

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References

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