Patent ID: 8133661

Claim:
A method of transferring a design pattern onto a wafer in a lithography process, comprising: providing a photomask having first and second patterns disposed in first and second areas, respectively, the first and second patterns being different and are a decomposition of the design pattern; performing a first exposure with the first and second patterns of the photomask to transfer the first pattern to a first area of the wafer and the second pattern to a second area of the wafer; adjusting a relative position between the wafer and the photomask by a distance substantially less than a scanner field; and performing a second exposure with the first and second patterns of the photomask to transfer the first pattern to a third area of the wafer and the second pattern to the first area of the wafer, wherein the first pattern and the second pattern overlap in the first area of the wafer such that the design pattern is formed in the first area.