Silicon Wafers, Semiconductors Silicon is the raw material most often used in integrated circuit (IC) fabrication. Integrated circuits are microelectronic semiconductors, devices consisting of many if not thousands of interconnected transistors. Silicon is the second most abundant substance on earth. It is extracted from rocks and common beach sand and put through an exhaustive purification process. In this form, silicon is the purist industrial substance that man produces, with impurities comprising less than one part …
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showed last 75 words of 1463 total
…deposited over the entire surface. The metal dips down into the circuit contact areas, touching the silicon. Most of the surface metal is then etched away, leaving an interconnection pattern between the circuit elements. The final layer is "vapox", or vapour-deposited-oxide, a glass-like material that protects the integrated circuit from contamination and damage. It too, is etched away, but only above the "bonding pads", the square aluminum areas to which wires will later be attached.