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Prime Grade Wafers
Prime wafers are the highest grade of commercial silicon wafers. They are referred to as ?device-quality?. Prime wafers have a high-quality polished. Prime wafers are typically more expensive than test wafers, and are used for applications that include photolithography and particle monitors. Prime wafers typically offer tighter resistivity specs and are used in ?high tech? projects or semiconductor manufacturing.
Test and Monitor Grade Wafers
Test or monitor wafers can be used for a variety of purposes, especially in equipment testing and other applications where a large quantity of wafers is necessary (marathon runs). Test and monitor wafers are used in testing and managing the control of semiconductor fabrication lines and processes. Although monitor wafers are substantially the same as prime polished wafers with respect to cleanliness, and in some cases flatness, other specifications are generally less rigorous. They are a more affordable option than prime wafers as they typically fall short on one or more specifications required to be classified as a prime wafer. In other words, test wafers are prime wafers with one or more non-compliant specification.
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