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Comprehensive study of anomalous conduction band structure of InxGa1−xAs1-−yNy

Published online by Cambridge University Press:  17 March 2011

C. Skierbiszewski ,
P. Perlin ,
P. Wisniewski ,
A. Presz ,
T. Suski ,
J. Geisz ,
W. Jantsch  and
D. Mars
C. Skierbiszewski
Affiliation:
High Pressure Research Center Unipress, Sokolowska 29/37, 01-142 Warszawa, Poland
P. Perlin
Affiliation:
High Pressure Research Center Unipress, Sokolowska 29/37, 01-142 Warszawa, Poland
P. Wisniewski
Affiliation:
High Pressure Research Center Unipress, Sokolowska 29/37, 01-142 Warszawa, Poland
A. Presz
Affiliation:
High Pressure Research Center Unipress, Sokolowska 29/37, 01-142 Warszawa, Poland
T. Suski
Affiliation:
High Pressure Research Center Unipress, Sokolowska 29/37, 01-142 Warszawa, Poland
J. Geisz
Affiliation:
National Renewable Energy Laboratory, Golden, CO 80401, USA
W. Jantsch
Affiliation:
Institut für Halbleiterphysik, Johannes-Kepler-Universität, A-4040 Linz, Austria
D. Mars
Affiliation:
Agilent Laboratories, Palo Alto, USA
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Abstract

Using free standing layer of InGaAsN we have succeeded in measuring the optical absorption in very broad spectral range (0.8-2.5eV). This gave us an insight into the conduction band density of states for the energies higher than the energy gap of this compound. By combining Hall effect measurements with determination of plasma edge frequency in infrared reflectivity for differently doped samples we were able to deduce the density of states, conduction band electrons effective mass and dispersion relation. In particular it turned out that both i) experimentally measured dispersion relation of the conduction band shows extremely high degree of nonparabolicity and consistently ii) the effective mass of electrons is few times larger than that corresponding to GaAs of the same electron concentration. So far the obtained experimental results are in line with recently proposed band anticrossing model of the electronic structure of III-N-V alloys.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 639: Symposium G – GaN and Related Alloys-2000 , 2000 , G2.5
Copyright
Copyright © Materials Research Society 2001

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References

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