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

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.

wafer

(1) A small, thin continuous-loop magnetic tape cartridge that has been used from time to time for data storage and specialized applications.

(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.

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 (450mm is expected in the future). Various wafer sizes are used today depending on the type of chip being made. See chip 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
The person at the top is holding 150mm wafers; in the middle 200mm; and 300mm at the bottom. (Images courtesy of Texas Instruments, Inc., Advanced Micro Devices, Inc. and Intel Corporation, respectively).


Different Sizes
The person at the top is holding 150mm wafers; in the middle 200mm; and 300mm at the bottom. (Images courtesy of Texas Instruments, Inc., Advanced Micro Devices, Inc. and Intel Corporation, respectively).


Different Sizes
The person at the top is holding 150mm wafers; in the middle 200mm; and 300mm at the bottom. (Images courtesy of Texas Instruments, Inc., Advanced Micro Devices, Inc. and Intel Corporation, respectively).








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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An advanced pre-wet module wets deep-featured wafers prior to plating to ensure superior metallization.
According to Reid, Ibis believes that these orders substantiate the Company's position that it is the world's silicon wafer manufacturers who are best positioned to meet the increasing demand for production volumes of SOI wafers for the global semiconductor industry.
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Since that time, our engineers have worked very closely with the SUMCO engineers not only to complete the rigorous factory acceptance testing process, but to improve the quality and lower the cost of 300 mm SIMOX-SOI wafers processed through the implanter.
a leading supplier of factory automation solutions for the semiconductor, electronics, and life sciences industries will be showcasing the latest generation of their wafer handling workcells at the Semicon West tradeshow which opens next week in San Francisco, CA.
In order to expedite the implementation of this new product, Quartz Unlimited will sell the quartz wafers directly to the chipmaking fabs worldwide.
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SCHARDING, Austria -- EV Group (EVG), which has more wafer bonders in production around the world than any other equipment maker, has installed a low-temperature wafer bonding system at Silicon Microstructures, Inc.
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