Masks are not whole wafer , except in some packaging cases. The mask illuminates a 25*35 area, for both 300mm and 200mm. Masks are not a significant expense fo

Masks are not whole wafer , except in some packaging cases. The mask illuminates a 25*35 area, for both 300mm and 200mm. Masks are not a significant expense for most processes. Nor is the bare wafer. It is all the process steps that drive the cost. 300mm qafer