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Oxygen Effects on Plastic Flow During Growth of Dendritic Web Si

Published online by Cambridge University Press:  28 February 2011

J. A. Spitznagel ,
R. G. Seidensticker ,
S. Y. Lien  and
R. H. Hopkins
J. A. Spitznagel
Affiliation:
Westinghouse R&D Center, 1310 Beulah Road, Pittsburgh, PA 15235
R. G. Seidensticker
Affiliation:
Westinghouse R&D Center, 1310 Beulah Road, Pittsburgh, PA 15235
S. Y. Lien
Affiliation:
Westinghouse R&D Center, 1310 Beulah Road, Pittsburgh, PA 15235
R. H. Hopkins
Affiliation:
Westinghouse R&D Center, 1310 Beulah Road, Pittsburgh, PA 15235
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Abstract

The possible effects of oxygen on plastic flow of Si ribbons during growth by the, dendritic web process are described. Cooling rates preclude homogeneous nucleation and growth of detectable SiOx precipitates. Calculated resolved shear stresses on {111} <110> slip systems arising from thermoelastic strains exhibit periodic oscillations in sign and magnitude. The dwell times at elevated temperatures corresponding to zero or low stress periods accompanying such sign reversals are shown to be sufficiently long to permit decoration and locking of dislocations by oxygen atoms.

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References

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