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Sign of the Piezoelectric Field in Asymmetric GaInN/AlGaN/GaN Single and Double Quantum Wells on SiC

Published online by Cambridge University Press:  03 September 2012

Jin Seo Im ,
A. Hangleiter ,
J. Off  and
F. Scholz
Jin Seo Im
Affiliation:
Institut für Technische Physik, Technische Universität Braunschweig, Mendelssohnstr. 2, D-38106 Braunschweig, Germany
A. Hangleiter
Affiliation:
Institut für Technische Physik, Technische Universität Braunschweig, Mendelssohnstr. 2, D-38106 Braunschweig, Germany
J. Off
Affiliation:
4. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany
F. Scholz
Affiliation:
4. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany
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Abstract

We study both GaInN/GaN/AlGaN quantum wells with an asymmetric barrier structure grown on SiC substrate and GaN/AlGaN asymmetric double quantum well (ADQW) structures. In the first case, a time-resolved study reveals an enhanced oscillator strength when the AlGaN barrier is on top of the GaInN quantum well. In comparison to our previous study of the same structure grown on sapphire, we find that the sign of the field is the same in both cases: the field points towards the substrate. In the case of ADQW, we observed not only intrawell transitions of both a 4 nm and a 2 nm QW separated by a 2.5 nm AlGaN barrier but also an interwell transition between the two QWs in the photoluminescence. The lifetimes and emission energies of the transitions can be well explained by the existence of the piezoelectric field built in the QWs.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 595: Symposium W – GaN and Related Alloys - 1999 , 1999 , F99W11.28
Copyright
Copyright © Materials Research Society 1999

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