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Rie Passivation Layer Removal by Remote H-Plasma and H2/SiH4 Plasma Processing

Published online by Cambridge University Press:  15 February 2011

Hong Ying ,
J. P. Barnak ,
Y. L. Chen  and
R. J. Nemanich
Hong Ying
Affiliation:
Department of Electrical and Computer Engineering, North Carolina State University, Raleigh, NC 27695-8202
J. P. Barnak
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695-8202
Y. L. Chen
Affiliation:
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695-8202
R. J. Nemanich
Affiliation:
Department of Physics, North Carolina State University, Raleigh, NC 27695-8202
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Abstract

Remote H-plasma and H2/SiH4 plasma processes were studied as potential dry cleaning processes following reactive ion etching (RIE). The processes were compared to a process of UV/ozone followed by an HF dip. The native oxide from Si(100) substrates was removed with an RIE etch of CHF3/Ar. The RIE process produced ∼150Å of a continuous fluorocarbon (CFx) passivation layer on the Si surface. For the post-RIE-cleaning three approaches were studied and compared including (1) uv-ozone exposure followed by an HF dip, (2) remote H-plasma exposure, and (3) remote H2/SiH4 plasma exposure. Auger electron spectroscopy (AES) was used to investigate the surface chemical composition, and AFM was used to measure changes in surface roughness. All three processes showed substantial removal of the passivation layer. The CF× polymer was completely removed in less than 1 min for samples exposed to a 100W remote H-plasma at 15mTorr and 450°C. With the addition of ∼0.1% of SiH4, the remote H2/SiH4 plasma also showed increased removal of residual oxygen contamination. The surface roughness of the plasma processed surfaces increased slightly.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 386: Symposium O – Ultraclean Semiconductor Processing Technology and Surface , 1995 , 285
Copyright
Copyright © Materials Research Society 1995

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References

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