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Effect of Cu on Al Interfacial Mass Transport in Bamboo Rie and Damascene Al(Cu)

Published online by Cambridge University Press:  10 February 2011

J. Proost ,
H. Li ,
A. Witvrouw  and
K. Maex
J. Proost
Affiliation:
also at ESA T-INSYS, K. U. Leuven
H. Li
Affiliation:
IMEC, Kapeldreef 75, B-3001 Leuven, Belgium
A. Witvrouw
Affiliation:
IMEC, Kapeldreef 75, B-3001 Leuven, Belgium
K. Maex
Affiliation:
also at Dept. of Materials Science (MTM), de Croylaan 2, B-3001 Leuven, Belgium
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Abstract

In this work, the electromigration (EM)-behaviour of bamboo RIE and damascene Al(Cu) interconnects has been studied by drift experiments. For RIE lines, both lattice and interface EM can be operative, depending on the Cu-distribution. Cu-alloying only retains its retarding effect for Al-diffusion at metallic interfaces, while the accompanying presence of an incubation time was found to become rate-controlling for the EM-performance at operating conditions. Contrary to the case of polycrystalline lines, the higher EM-threshold still observed for bamboo damascene relative to RIE is now insufficient to compensate for the significantly increased Cudepletion rate in bamboo damascene due to both geometrical and metallurgical reasons.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 563: Symposium M – Materials Reliability in Microelectronics IX , 1999 , 91
Copyright
Copyright © Materials Research Society 1999

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