Production Of Silicon Chips

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separate almost all of the impurities.The remaining liquid is then heated in a hydrogen tmosphere, which produces the purest silicon possible. This silicon, however, is in the form of many crystals of different sizes and orientations. This silicon goes through the Czochralski pulled crystal
process in which it is melted in a large crucible into which a probe, tipped with a small seed crystal is immersed. Silicon atoms attach themselves to the seed in perfect alignment with its structure while it is rotated and pulled slowly upward. The seed grows into a three foot long, cylindrical, single crystal.
Silicon this pure is hard, dark grey in color and lusterous. The giant crystal of silicon is next ground into a perfect cylinder, which is sliced by a diamond-tipped saw into wafers 1 mm thick. Using particles one-tenth of a micrometer wide, the faces of these wafers are polished to give a smooth base onto which up to two hundred dentical chips can simultaneously be photo-etched.
The ...

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