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Constraint Effects on Thin Film Channel Cracking Behavior

Published online by Cambridge University Press:  03 March 2011

Ting Y. Tsui ,
Andrew J. McKerrow  and
Joost J. Vlassak
Ting Y. Tsui*
Affiliation:
Silicon Technology Development, Texas Instruments Inc., Dallas, Texas 75246
Andrew J. McKerrow
Affiliation:
Silicon Technology Development, Texas Instruments Inc., Dallas, Texas 75246
Joost J. Vlassak
Affiliation:
Division of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138
*
a) Address all correspondence to this author. e-mail: ttsui@ti.com This paper was selected as the Outstanding Meeting Paper for the 2005 MRS Spring Meeting Symposium B Proceedings, Vol. 863.
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Abstract

One of the most common forms of cohesive failure observed in brittle thin film subjected to a tensile residual stress is channel cracking, a fracture mode in which through-film cracks propagate in the film. The crack growth rate depends on intrinsic film properties, residual stress, the presence of reactive species in the environments, and the precise film stack. In this paper, we investigate the effect of various buffer layers sandwiched between a brittle carbon-doped-silicate (CDS) film and a silicon substrate on channel cracking of the CDS film. The results show that channel cracking is enhanced if the buffer layer is more compliant than the silicon substrate. Crack velocity increases with increasing buffer layer thickness and decreasing buffer layer stiffness. This is caused by a reduction of the constraint imposed by the substrate on the film and a commensurate increase in energy release rate. The degree of constraint is characterized experimentally as a function of buffer layer thickness and stiffness, and compared to the results of a simple shear lag model that was proposed previously. The results show that the shear lag model does not accurately predict the effect of the buffer layer.

Keywords

FractureGlassThin film
Type
Outstanding Meeting Paper
Information
Journal of Materials Research , Volume 20 , Issue 9 , September 2005 , pp. 2266 - 2273
Copyright
Copyright © Materials Research Society 2005

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References

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