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Effectiveness of Plasma Nitrided Silicon Oxynitride as a Barrier Layer between High k Materials and Si Substrates

Published online by Cambridge University Press:  11 February 2011

Yi-Sheng Lai  and
J. S. Chen
Yi-Sheng Lai
Affiliation:
Department of Materials Science and Engineering, National Cheng Kung University, Tainan, TAIWAN
J. S. Chen
Affiliation:
Department of Materials Science and Engineering, National Cheng Kung University, Tainan, TAIWAN
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Abstract

In this work, low temperature (300 – 450°C) plasma nitridation was conducted using N2O and NH3 atmosphere to produce an ultrathin SiOxNy layer. The bonding structure, distribution, and quantity of nitrogen and their effects on the growth kinetic of SiOxNy layers are studied by X-ray photoelectron spectroscopy (XPS). It is found that nitrogen atoms pile at the SiOxNy/Si interface at the very beginning of plasma N2O and NH3 nitridation. Due to the lack of additional Si source and low diffusivity of O or N atoms at low temperature, plasma nitridation will form a self-limited growth of SiOxNy layer. Thermal stability of the interlayer between ultrathin Ta2O5 films on bare Si, plasma N2O nitrided Si, and plasma NH3 nitrided Si is also studied.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 745: Symposium N – Novel Materials and Processes for Advanced CMOS , 2002 , N5.22
Copyright
Copyright © Materials Research Society 2003

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References

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