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Influence of Spontaneous and Piezoelectric Polarizations on the Lattice Dynamics of III-Nitride Structures

Published online by Cambridge University Press:  21 March 2011

Jérôme Gleize ,
Jean Frandon ,
Marie A. Renucci  and
Friedhelm Bechstedt
Jérôme Gleize
Affiliation:
Laboratoire de Physique des Solides, UMR 5477 CNRS, Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse cedex 4, France
Jean Frandon
Affiliation:
Laboratoire de Physique des Solides, UMR 5477 CNRS, Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse cedex 4, France
Marie A. Renucci
Affiliation:
Laboratoire de Physique des Solides, UMR 5477 CNRS, Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse cedex 4, France
Friedhelm Bechstedt
Affiliation:
Institut für Festkörpertheorie und Theoretische Optik, Friedrich Schiller Universität, D-07743 Jena, Germany
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Abstract

The influence of pyroelectric and piezoelectric polarizations on the lattice dynamics of strained III-nitride based structures is investigated within a macroscopic framework. New relationships between stress and strain are derived, which take into account the piezoelectric fields, which appear in the strained III-nitride layers. Consequently, the strained phonon frequencies in such systems differ from those calculated within the elasticity theory framework. In the case of strained, free-standing GaN/AlN superlattices grown along the [0001] axis, the difference of the spontaneous polarizations of GaN and AlN also contributes to the change in the effective strain along the growth direction. The corresponding shift of the zone center phonon frequencies of GaN and AlN might be negligible or significant, depending on the value of the ratio of the GaN and AlN layer thickness.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 680: Symposium E – Wide Bandgap Electronics , 2001 , A4.9
Copyright
Copyright © Materials Research Society 2001

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References

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