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Elastic Misfit Strain Relaxation in Highly Strained InAs Dots on GaAs as Studied by Tem, AFM and VFF Atomistic Calculations

Published online by Cambridge University Press:  21 February 2011

Y. Androussi ,
P. Francois ,
A. Lefebvre ,
C. Priester ,
I. Lefebvre ,
G. Allan ,
M. Lannoo ,
J. M. Moison ,
N. Lebouche  and
F. Barthe
Y. Androussi
Affiliation:
LSPES - USTLBâtiment C6, 59655 Villeneuve d'Ascq cedex, France
P. Francois
Affiliation:
LSPES - USTLBâtiment C6, 59655 Villeneuve d'Ascq cedex, France
A. Lefebvre
Affiliation:
LSPES - USTLBâtiment C6, 59655 Villeneuve d'Ascq cedex, France
C. Priester
Affiliation:
IEMN, Dept ISEN, 41 Bvd Vauban, 59046 Lille cedex, France
I. Lefebvre
Affiliation:
IEMN, Dept ISEN, 41 Bvd Vauban, 59046 Lille cedex, France
G. Allan
Affiliation:
IEMN, Dept ISEN, 41 Bvd Vauban, 59046 Lille cedex, France
M. Lannoo
Affiliation:
IEMN, Dept ISEN, 41 Bvd Vauban, 59046 Lille cedex, France
J. M. Moison
Affiliation:
France Telecom, CNET Paris B, Laboratoire de Bagneux, 196 Avenue Henri Ravera, BP107, 92225 Bagneux cedex, France
N. Lebouche
Affiliation:
France Telecom, CNET Paris B, Laboratoire de Bagneux, 196 Avenue Henri Ravera, BP107, 92225 Bagneux cedex, France
F. Barthe
Affiliation:
France Telecom, CNET Paris B, Laboratoire de Bagneux, 196 Avenue Henri Ravera, BP107, 92225 Bagneux cedex, France
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Abstract

The deposition of InAs on GaAs results, above a 1.75 monolayer coverage, in the formation of dots on a residual 2D wetting layer. Atomic force microscopy (AFM) measurements show that these dots are in the quantum size range (height 3 nm, half-base 12 nm). Transmission electron microcopy (AFM) observations show that they are coherently strained and the corresponding strain contrast is simulated using the dynamical electron diffraction contrast theory. The dot strain fields used for the TEM contrast simulations are either deduced from continuous elastic models or determined by valence force field (VFF) atomistic calculations. That experimental TEM images and simulated images should match shows that the methods of determination of the dot strain fields are valid.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 355: Symposium B1 – Evolution of Thin-Film and Surface Structure and Morphology , 1994 , 569
Copyright
Copyright © Materials Research Society 1995

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References

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