wafer

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wafer

1. Christianity a thin disc of unleavened bread used in the Eucharist as celebrated by the Western Church
2. Pharmacol an envelope of rice paper enclosing a medicament
3. Electronics a large single crystal of semiconductor material, such as silicon, on which numerous integrated circuits are manufactured and then separated
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

wafer

[′wā·fər]
(electronics)
A thin semiconductor slice on which matrices of microcircuits can be fabricated, or which can be cut into individual dice for fabricating single transistors and diodes.
(engineering)
A flat element for a process unit, as in a series of stacked filter elements.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

wafer

(1) A small magnetic tape cartridge in the early 1980s. 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 300mm (11.8") 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 (see active area).

Wafers started out from one to three inches in diameter. Then came 100mm ingots (3.9"), followed by 125mm (4.9"), 150mm (5.9"), 200mm (7.9") and 300mm (11.8"). The much larger 450mm (17.7") wafer has yet to be produced in large quantities due to the huge investment in new machinery. See chip, chip manufacturing, transistor and wafer scale integration.


The Boule Is Sliced
The silicon ingot, which is known as a "boule," is sliced into wafers. (Image courtesy of IBM.)







Different Sizes
From top to bottom, the wafers are 150, 200 and 300mm (5.9", 7.9" and 11.8") in diameter. (Images from top to bottom courtesy of Texas Instruments, Inc., Advanced Micro Devices, Inc. and Intel Corporation.).


Different Sizes
From top to bottom, the wafers are 150, 200 and 300mm (5.9", 7.9" and 11.8") in diameter. (Images from top to bottom courtesy of Texas Instruments, Inc., Advanced Micro Devices, Inc. and Intel Corporation.).


Different Sizes
From top to bottom, the wafers are 150, 200 and 300mm (5.9", 7.9" and 11.8") in diameter. (Images from top to bottom courtesy of Texas Instruments, Inc., Advanced Micro Devices, Inc. and Intel Corporation.).







Heating the Wafers
The red glow comes from a furnace that reaches 1000 degrees centigrade. The semiconductor wafers are baked in the oven to prepare them for the chip-making process. (Image courtesy of Intel Corporation.)
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The fat suit was born as a sign of the redundancy of post-scarcity excess; just the addition of a wafer-thin mint illustrated--in the most disgusting and graphic way--the exact point where super-tanker gluttons became fabulous foodies, their rib cages exposed like shipwrecks.
Enterprise disk makers may not be especially eager to watch their margin-rich enterprise drives be swallowed up by the wafer-thin margins of their 2.5-inch SATA drives.
Another one of these wafer-thin child-women, all cheekbones and very little talent, she upsets the balance with some very bad acting and a character who's at a loss.
The growing demand for new housing has often led to creative, sometimes odd solutions: wafer-thin buildings, home conversions both legal and illegal, apartments in former commercial spaces.
It is this lid which prevents Irish Yogurts from using a traditional metal detector from Loma's range, as their high sensitivity would result in the wafer-thin sheet of foil being picked up on each pot.
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With wafer-thin margins in the reselling business, Rigby may well see JBA as a way to build up a services arm to his business which has 2,000 employees.
Although busty voluptuous-looking women have taken a prominent role in American culture as seen in magazines, movies, TV, and even ads for health clubs, the image of the wafer-thin, nearly emaciated Ally McBeal-type is still a powerful force in our society.