Problem NO: 1

A single crystal boule of silicon is grown by the Czochralski process to an average diameter of 320\nmm with length = 1500 mm. The seed and tang ends a

A single crystal boule of silicon is grown by the Czochralski process to an average diameter of 320

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mm with length = 1500 mm. The seed and tang ends are removed, which reduces the length to 1150

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mm. The diameter is ground to 300 mm. A 90-mm-wide flat is ground on the surface which extends

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from one end to the other. The ingot is then sliced into wafers of thickness = 0.50 mm, using an

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abrasive saw blade whose thickness = 0.33 mm. Assuming that the seed and tang portions cut off

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the ends of the starting boule were conical in shape, determine (a) the original volume of the boule,

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mm3; (b) how many wafers are cut from it, assuming the entire 1150 mm length can be sliced; and

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(c) the volumetric proportion of silicon in the starting boule that is wasted during processing.

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