Mask set

A mask set or a photomask set is a series of electronic data that define geometry for the photolithography steps of semiconductor fabrication. Each of the physical masks generated from this data is called a photomask.

A mask set for a modern process typically contains as many as twenty or more masks, each of which defines a specific photolithographic step in the semiconductor fabrication process. Examples of masks include:

• p-well
• n-well
• active
• poly
• p-select
• n-select
• contact
• metal1, 2, 3...

For more information, see photolithography and semiconductor manufacturing.