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Dislocation Networks Strain Fields Induced By Si Wafer Bonding.

Published online by Cambridge University Press:  18 March 2011

J. Eymery ,
F. Fournel ,
K. Rousseau ,
D. Buttard ,
F. Leroy ,
F. Rieutord  and
J.L. Rouvière
J. Eymery
Affiliation:
CEA/Grenoble, Département de Recherche Fondamentale
F. Fournel
Affiliation:
LETI/Département des Technologies Silicium, 17 rue des martyrs, 38054 Grenoble Cedex 9, France
K. Rousseau
Affiliation:
CEA/Grenoble, Département de Recherche Fondamentale
D. Buttard
Affiliation:
CEA/Grenoble, Département de Recherche Fondamentale
F. Leroy
Affiliation:
CEA/Grenoble, Département de Recherche Fondamentale
F. Rieutord
Affiliation:
CEA/Grenoble, Département de Recherche Fondamentale
J.L. Rouvière
Affiliation:
CEA/Grenoble, Département de Recherche Fondamentale
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Abstract

Buried dislocation superlattices are obtained by bonding ultra-thin single crystal Si (001) films on Si (001) wafers. The twist of two Si wafers induces a regular square grid of dissociated screw dislocations and the tilt a 1-D array of mixed dislocation. The Burgers vector is a/2 <110> for both types of dislocation. The atomic displacements and deformations of pure screw and edge dislocations are calculated with an isotropic elasticity approximation taking into account the free surface and the thickness of the upper crystal. It is shown by these calculations that the elastic strain field propagates up to the surface, and quantitative arguments are given to choose the network period / film thickness ratio.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 673: Symposium P – Dislocations and Deformation Mechanisms in Thin Films and Small Structures , 2001 , P6.9
Copyright
Copyright © Materials Research Society 2001

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References

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