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Indentation fracture of low-dielectric constant films: Part II. Indentation fracture mechanics model

  • Dylan J. Morris (a1) and Robert F. Cook (a1)
  • DOI: http://dx.doi.org/10.1557/jmr.2008.0295
  • Published online: 01 January 2011
Abstract

Part I [D.J. Morris and R.F. Cook, J. Mater. Res.23, 2429 (2008)] of this two-part work explored the instrumented indentation and fracture phenomena of compliant, low-dielectric constant (low-κ) films on silicon substrates. The effect of film thickness and probe acuity on the fracture response, as well as the apparent connection of this response to the perceived elastic modulus, were demonstrated. These results motivate the creation of a fracture model that incorporates all of these variables here in Part II. Indentation wedging is identified as the mechanism that drives radial fracture, and a correction is introduced that adjusts the wedging strength of the probe for the attenuating influence of the relatively stiff substrate. An estimate of the film fracture toughness can be made if there is an independent measurement of the film stress; if not, a critical film thickness for channel-cracking under the influence of film stress may be estimated.

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a)Address all correspondence to this author. e-mail: dylan.morris@nist.gov
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