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Effect of RF Sputtering on T/H Susceptibility of Cr/Polyimide Adhesion

Published online by Cambridge University Press:  25 February 2011

D. G. Kim ,
T. S. Oh ,
S. Molis ,
S. Kowalczyk  and
J. Kim
D. G. Kim
Affiliation:
IBM, T. J. Watson Research Center, Yorktown Heights, NY 10598
T. S. Oh
Affiliation:
KIST, Cheong-Ryang P. O. Box 131, Seoul, Korea
S. Molis
Affiliation:
IBM, T. J. Watson Research Center, Yorktown Heights, NY 10598
S. Kowalczyk
Affiliation:
IBM, T. J. Watson Research Center, Yorktown Heights, NY 10598
J. Kim
Affiliation:
IBM, T. J. Watson Research Center, Yorktown Heights, NY 10598
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Abstract

Effects of RF sputtering on the hydrothermal stability of Cr/polyimide interfaceshave been studied using FTIR, XPS, and peel test. It has been found that RF sputter-treatment of polyimnide surface prior to metal deposition leads to an enhancement of adhesion through chemical bonding of the metal with polyimide resulting in cohesive polyimide failure. The RF sputter treatment of polyimide, however, simultaneously modifies the polyimide underneath its surface. The adhesion strength of the Cr/polyimide interfaceis degraded significantly upon exposure to a temperature/humidity (T/H) environment. It is suggested this degradation results from the hydrolysis of polyimide. The hydrolysis is facilitated by the presence of modified unstable polyimide near the interface. This degradation of adhesion strength can be minimized by converting the unstablemodified polyimide to a more stable state by re-curing the Cr/polyimide interfacebefore exposure to T/H environment.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 203: Symposium D – Electronic Packaging Materials Science V , 1990 , 65
Copyright
Copyright © Materials Research Society 1991

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References

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