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Characterization of striations in silicon wafers by a multipass Fabry-Pérot Rayleigh-Brillouin scattering spectrometer

Published online by Cambridge University Press:  03 March 2011

Lu Taijing
Affiliation:
Department of Physics, National University of Singapore, Lower Kent Ridge Road, Singapore 0511, Republic of Singapore
S.C. Ng
Affiliation:
Department of Physics, National University of Singapore, Lower Kent Ridge Road, Singapore 0511, Republic of Singapore
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Abstract

Swirls and oxidation stacking faults (OSF) ring-bands in the near surface region of Si crystals have been detected and characterized by a 180°backscattering Rayleigh-Brillouin spectrometer using an argon-ion laser as its light source. In FZ Si wafers with swirls, the central region exhibits high scattered light with random undulation, the peripheral region with swirls shows a periodic undulation of scattered light intensity, while the region in-between is a nearly uniform zone of low scattered light intensity. In contrast to this, the CZ Si wafers with OSF ring-bands display a low uniformly scattered light background with a high undulated scattered light zone corresponding to the OSF ring-band. The scattered light intensity and its structure in the OSF ring-band vary with the heat-treatment conditions. The features of scattered light detected by the scattering spectrometer are discussed.

Type
Articles
Copyright
Copyright © Materials Research Society 1994

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References

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