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Atomic Self-ordering in Heteroepitaxially Grown Semiconductor Quantum Dots due to Relaxation of External Lattice Mismatch Strains

Published online by Cambridge University Press:  17 March 2011

Peter Möck ,
Teya Topuria ,
Nigel D. Browning ,
Robin J. Nicholas  and
Roger G. Booker
Peter Möck
Affiliation:
Department of Physics (MC 273), University of Illinois at Chicago, 845 W. Taylor Street, Chicago, IL 60607- 7059, U.S.A; pmoeck@uic.edu
Teya Topuria
Affiliation:
Department of Physics (MC 273), University of Illinois at Chicago, 845 W. Taylor Street, Chicago, IL 60607- 7059, U.S.A; pmoeck@uic.edu
Nigel D. Browning
Affiliation:
Department of Physics (MC 273), University of Illinois at Chicago, 845 W. Taylor Street, Chicago, IL 60607- 7059, U.S.A; pmoeck@uic.edu
Robin J. Nicholas
Affiliation:
Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU, U.K
Roger G. Booker
Affiliation:
Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, U.K
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Abstract

Thermodynamic arguments are presented for the formation of atomic order in heteroepitaxially grown semiconductor quantum dots. From thermodynamics several significant properties of these systems can be derived, such as an enhanced critical temperature of the disorder-order transition, the possible co-existence of differently ordered domains of varying size and orientation, the possible existence of structures that have not been observed before in semiconductors, the occurrence of atomic order over time, and the occurrence of short range order when the growth proceeds at low temperatures. Transmission electron microscopy results support these predictions. Finally, we speculate on the cause for the observed increase in life time of (In,Ga)As/GaAs quantum dot lasers [H-Y. Liu et al., Appl. Phys. Lett. 79, 2868 (2001)].

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 696: Symposium N – Current Issues in Heteroepitaxial Growth--Stress Relaxation and Self Assembly , 2001 , N8.8
Copyright
Copyright © Materials Research Society 2002

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