A CDE Definition
(1) A small continuous-loop magnetic tape cartridge that was used from time to time for data storage. See Stringy Floppy.
(2) The base unit of chip making. A wafer is a slice taken from a salami-like silicon crystal ingot up to 450 mm (17.7") in diameter. The larger the wafer, the more chips produced in a single production pass, which comprises a series of photomasking, etching and implantation steps. Wafers are approximately 1/30th of an inch thick; however, the actual layers of transistors that make up the active circuitry are only a few microns deep.
Wafers started out being very small from one to three inches in diameter. Then came 100mm ingots (3.9"), followed by 125, 150, 200 and 300mm. Various wafer sizes are used today depending on the type of chip being made. See chip and wafer scale integration.
The Boule Is Sliced
Heating the Wafers
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