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Current spreading in AlGaN:Mg cladding layers of laser structures

Published online by Cambridge University Press:  21 March 2011

Stephan Figge ,
Tim Böttcher ,
Christoph Zellweger ,
Marc Ilegems  and
Detlef Hommel
Stephan Figge
Affiliation:
University of Bremen, Institute of Solid State Physics Kufsteiner Str., 28359 Bremen, Germany
Tim Böttcher
Affiliation:
University of Bremen, Institute of Solid State Physics Kufsteiner Str., 28359 Bremen, Germany
Christoph Zellweger
Affiliation:
Ecole Polytechnique Fédérale de Lausanne, Institut de micro- et optoélectronique EPFL, Lausanne Switzerland
Marc Ilegems
Affiliation:
Ecole Polytechnique Fédérale de Lausanne, Institut de micro- et optoélectronique EPFL, Lausanne Switzerland
Detlef Hommel
Affiliation:
University of Bremen, Institute of Solid State Physics Kufsteiner Str., 28359 Bremen, Germany
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Abstract

The consequences of the anisotropic resistance in AlGaN/GaN strained layer superlattices for the operation of laser diodes were studied for structures driven in LED mode. A series of laser structures containing different Mg-doped AlGaN bulk and AlGaN/GaN strained layer superlattice cladding layers was compared to estimate the current spreading in the cladding due to the formation of 2D-hole gases. Current-voltage measurements revealed a significant spread of the current path in the superlattices, whereas no spreading was seen for the bulk cladding. In contrast to this, investigations of the electroluminescence showed no significant differences.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 693 , 2001 , I11.26.1
Copyright
Copyright © Materials Research Society 2002

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