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How do Impurity Inclusions Influence the Mechanical Properties of Multicrystalline Silicon?

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Table 1: Concentration of impurities [ppmw] within the silicon  feedstock.Al B Ca Fe Mn Cu217177669370464 IK = Y σ a 2 Ic c KG E= (2) 3 rr P R rσ = −      (3) (4) ( ) ( ) ( 1 ) ( 1 2 ) 2 i si fSi i Si i T TPvvEEα α−−=+−+ (1) (5)32p Rrθθσ=    
Figure 1: Coordinate system used to evaluate the mechanical  stresses around inclusions [19].
Figure 3 Two-dimensional configuration of collinear micro-crack  ahead of the main crack [25].
Figure 5: Dendritic silicon oxide inclusions in multicrystalline silicon  at 5% of the relative ingot height.
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