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Paramagnetic Defect Analysis in UV Lamp Induced Chemical Vapour Deposited a-SiO2 Films

Published online by Cambridge University Press:  22 February 2011

C. Debauche ,
C. Licoppe ,
J. Flicstein  and
R. A. B. Devine
C. Debauche
Affiliation:
Centre National d'Etudes des Telecommunications, BP 107, 92225 Bagneux, France
C. Licoppe
Affiliation:
Centre National d'Etudes des Telecommunications, BP 107, 92225 Bagneux, France
J. Flicstein
Affiliation:
Centre National d'Etudes des Telecommunications, BP 107, 92225 Bagneux, France
R. A. B. Devine
Affiliation:
Centre National d'Etudes des Telecommunications, BP 107, 92225 Bagneux, France
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Abstract

An electron spin resonance study has been carried out on a-SiO2 films deposited from SiH4 and N2O gases using UV lamp induced chemical vapour deposition. Deposition pressures have been varied from 5 torr to 30 torr whilst the substrate temperature was maintained at 240°C. Bridging nitrogen (O3≡Si-N-Si≡O3) and oxygen-vacancy center defects are observed in small quantities (≈ 1016cm−3) whilst over coordinated N defects are observed in concentrations up to 1018 cm−3 dependent upon the deposition pressure. The concentration of these defects can be dramatically reduced either by depositing the a-SiO2 at high pressures (≈ 30 torr) or by post-deposition annealing at ≈ 600°C. Comparison with data on films produced by plasma enhanced chemical vapour deposition demonstrates that the mode of incorporation of nitrogen into the network depends critically upon the chemical species in the deposition reactor.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 284: Symposium G – Amorphous Insulating Thin Films , 1992 , 307
Copyright
Copyright © Materials Research Society 1993

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References

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