wafer


Also found in: Dictionary, Thesaurus, Medical, Legal, Financial, Acronyms, Wikipedia.

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.)
References in periodicals archive ?
2014E): Percentage Breakdown by Wafer Sizes (includes
SOI wafers, like prime wafers, can contain yield-killing void defects at the surface of the SOI wafer.
Incorporating the proven Stratus process cell design, Stratus 200/300 offers multiple wafer size capability plus the added feature of rapid size change with minimal downtime.
These statements include, but are not limited to, those associated with the shipment of product to the aforementioned silicon wafer supplier, the effect of ADE products on customer product quality and production rates, and expected 300mm silicon wafer demand.
Reid, president and chief executive officer of Ibis Technology Corporation, said, "We are pleased that the SUMCO implanter has completed the final acceptance process, and we expect that SUMCO will begin using this tool for producing 300-millimeter SIMOX-SOI wafers immediately.
Our first lot of wafers for mass production of DRAM using advanced 90 nm process technology started on October 17, 2005," said Shuichi Otsuka, president of Hiroshima Elpida.
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.
Healy and Misra plan to focus on developing partnerships with leading semiconductor companies who will be implementing the Cubic Wafer process for developing highly integrated circuits (ICs) for breakthrough applications while enhancing production and dramatically reducing costs.
We are extremely pleased with the WaferMate(TM) workcells, and excited about the opportunities that they will offer to expand our market in the automated wafer handling industry" says Scott Klimczak, president of CHAD Industries.
In order to expedite the implementation of this new product, Quartz Unlimited will sell the quartz wafers directly to the chipmaking fabs worldwide.
Nasdaq:FORM) today announced delivery of it's latest product for enabling breakthrough wafer test performance and throughput in the emerging System-on-Chip (SoC) flip chip market.
ASE) (TAIEX: 2311) (NYSE: ASX), the world's largest semiconductor packaging and test company, and FlipChip International, LLC (FCI), the global leader in flip chip bumping and wafer level packaging technology, today announced they have signed an expanded technology licensing agreement.