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Electronic Properties of Dislocations in Heavily Dislocated Quantum well Structures: Doping Effects

Published online by Cambridge University Press:  28 February 2011

T. Y. Liu ,
P. M. Petroff ,
H. Kroemer  and
A. C. Gossard
T. Y. Liu
Affiliation:
Department of Electrical and Computer Engineering, and Materials Department, University of California at Santa Barbara, Santa Barbara, CA 93106
P. M. Petroff
Affiliation:
Department of Electrical and Computer Engineering, and Materials Department, University of California at Santa Barbara, Santa Barbara, CA 93106
H. Kroemer
Affiliation:
Department of Electrical and Computer Engineering, and Materials Department, University of California at Santa Barbara, Santa Barbara, CA 93106
A. C. Gossard
Affiliation:
Department of Electrical and Computer Engineering, and Materials Department, University of California at Santa Barbara, Santa Barbara, CA 93106
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Abstract

In heavily dislocated GaAs (dislocation density of 108cm-2), the low-temperature cathodo- luminescence efficiency of quantum wells and superlattices is dramatically higher than that of a bulk-like layer. Furthermore, the luminescence efficiency can be further improved by doping the barriers of the GaAs/(Al,Ga)As multi-quantum well structures with beryllium (Be). Two quite different possible models for this observation are discussed: One assumes that the effect is due to the expulsion of dislocation kinks from the wells, the other that it is due to the effect of well width fluctuations.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 145: Symposium A – III-V Heterostructures for Electronic/Photonic Devices , 1989 , 393
Copyright
Copyright © Materials Research Society 1989

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