Patent ID: 6563127
Filing Date: 2003-05-13
Classification: G03F

Abstract:
An optical proximity correction method for producing a rectangular contact, comprising:providing a first photomask; forming a first pattern on the first photomask, wherein the first pattern comprises of a pair of connected hammerhead patterns and a plurality of serif patterns at inner straight corners of the hammerhead patterns, and the hammerhead patterns are mirror images of each other; performing a first photolithographic step for a first photoresist layer using the first photomask, so that the pattern correction of the first phototmask is complete if the pattern on the first photoresist layer conforms to an aspect ratio of a desired rectangular pattern; reducing a width of the connecting section between the hammerhead patterns in the first pattern for forming a second pattern if the pattern on the first photoresist layer does not conform to the aspect ratio of the desired rectangular pattern; forming the second pattern on a second photomask; performing a second photolithographic step for a second photoresist layer using the second photomask; and adjusting the width of the connecting section and producing a patterned photoresist layer until a pattern on the photoresist layer conforms to the aspect ratio of the desired rectangular pattern.