Silicon wafer, c 1996.
3 3 c m
actual image size: 32cm x 25cm

Silicon wafer, c 1996.

© Science Museum / Science & Society Picture Library


Silicon chips are made by growing highly pure tubular silicon crystals, which are then sliced into thin wafers or circular discs. Many individual, identical chips are made simultaneously on each wafer in a series of optical and chemical proceses, which involve introducing specific impurities into defined areas of each chip, forming semiconductor devices. The devices are connected electrically by deposits of aluminium, and the wafer is then broken into separate chips, which are individually encapsulated. The different varieties of chips which can be made control all of the operational proceses and functions of a computer.

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