Tanner, B. K. and Garagorri, J. and Gorostegui-Colinas, E. and Elizalde, M. R. and Bytheway, R. and McNally, P. J. and Danilewsky, A. N. (2015) 'The geometry of catastrophic fracture during high temperature processing of silicon.', International journal of fracture., 195 (1-2). pp. 79-85.
The geometry of fracture associated with the propagation of cracks originating at the edges of (001) oriented, 200 mm diameter silicon wafers has been investigated under two regimes of high temperature processing. Under spike annealing, fracture did not occur on low index planes and all except one wafer exhibited crack patterns that started initially to run radially, but after a distance of typically 20–30 mm, turned and ran almost tangentially. Wafers subjected to plateau annealing, with a 60 s dwell time at high temperature, predominantly fractured through radial cracks running along ⟨110⟩ directions. X-ray diffraction imaging reveals substantial slip in all wafers subjected to plateau annealing. We demonstrate using finite element (FE) modelling that the change in fracture geometry is associated with this plastic deformation, which changes the stress distribution during the cooling phase of the rapid thermal annealing cycle. FE simulations without plastic relaxation show that the radial component of the thermal stress distribution is compressive in the centre of the wafer, causing the crack to run tangentially. Simulations incorporating temperature dependent plasticity showed that the equivalent stress becomes tensile when the plateau anneal allows time for significant plastic relaxation, permitting the crack to continue propagating linearly.
|Keywords:||Silicon, Rapid thermal annealing, X-ray diffraction imaging, Crack propagation.|
|Full text:||(AM) Accepted Manuscript|
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|Publisher Web site:||http://dx.doi.org/10.1007/s10704-015-0050-1|
|Publisher statement:||Open Access © The Author(s) 2015. This article is published with open access at Springerlink.com This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.|
|Date accepted:||22 October 2015|
|Date deposited:||03 November 2015|
|Date of first online publication:||03 November 2015|
|Date first made open access:||No date available|
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