Patent ID: 6749972
Filing Date: 2004-06-15
Classification: G03F

Abstract:
A method for producing a photomask for semiconductor photolithography processing comprising:for each pitch of a plurality of pitches within a semiconductor design, determining a bias needed at the pitch that maximizes a common process window for the plurality of pitches given a critical dimension (CD) specification for a semiconductor design of the photomask; modifying an original layout for the semiconductor design of the photomask by performing rule-based optical-proximity correction (OPC), including adding the bias determined at each pitch, to yield a modified layout for the semiconductor design of the photomask; and, further modifying the modified layout for the semiconductor design of the photomask by performing model-based OPC on the modified layout such that exposed semiconductor wafer CD's at each pitch are at least substantially equal to the CD specification for the pitch, to yield a final layout for the semiconductor design of the photomask.