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Self-Interstitial Injection Effects on Carbon Diffusion in Silicon At High Temperatures

Published online by Cambridge University Press:  28 February 2011

L. A. Ladd
Affiliation:
Mobil Solar Energy Corporation, 16 Hickory Drive, Waltham, Massachusetts 02254, USA
J. P. Kalejs
Affiliation:
Mobil Solar Energy Corporation, 16 Hickory Drive, Waltham, Massachusetts 02254, USA
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Abstract

Carbon diffusivity is reported for different ambient conditions imposed during annealing of silicon in the temperature range from 800 to 100°C, which produce varying levels of silicon self-interstitial supersaturation. The diffusivities are deduced from SIMS analysis of carbon out-diffusion profiles. Carbon diffusivity is increased by up to a factor of 70 in annealing with phosphorus in-diffusion, and by a factor of as much as seven in an oxidizing ambient, when compared to anneals in a nitrogen ambient. The enhancements tend to decrease above 11000C. This behavior can be explained by attributing the increase in carbon diffusivity to self-interstitial supersaturation which increases the concentration of highly mobile carbon selfinterstitial pairs. Significant time dependent effects were also observed for 800 and 9000C phosphorus in-diffusion conditions.

Type
Research Article
Copyright
Copyright © Materials Research Society 1986

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References

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