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Amorphization of Silicon by Ion Irradiation: The Role of the Divacancy

Published online by Cambridge University Press:  26 February 2011

R. G. Elliman ,
J. Linnros  and
W. L. Brown
R. G. Elliman
Affiliation:
CSIRO Materials Science and Technology, Clayton 3168, Australia.
J. Linnros
Affiliation:
Institute of Microelectronics, P.O.B. I084, Kista S-16421, Sweden
W. L. Brown
Affiliation:
AT&T Bell Laboratories, Murray Hill, NJ 07974, U.S.A.
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Abstract

Fixed fluence ion irradiation of silicon is shown to produce either defected crystal or amorphous silicon depending on the ion flux employed. The amorphous threshold flux, defined as the minimum flux required to generate a continuous amorphous layer for a fixed fluence irradiation, is measured as a function of irradiation temperature. This critical flux for amorphization is shown to satisfy an Arrhenius expression with a unique activation energy of ∼1.2eV, which corresponds to the migration/dissociation energy of the silicon divacancy. These observations lead to the conclusion that the stability of the silicon divacancy controls the competition between defect production and dynamic defect annealing, and hence the crystalline to amorphous phase transformation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 100: Symposium – A Fundamentals of Beam-Solid Interactions and Transient Thermal Processing , 1988 , 363
Copyright
Copyright © Materials Research Society 1988

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References

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