Patent ID: 7052810
Filing Date: 2006-05-30
Classification: G03F

Abstract:
1. A method for optical proximity effect correction of contact holes, comprising the steps of: providing a test photo mask, wherein a plurality of first hole patterns are built thereon and the first hole patterns are combinations of at least one pitch and at least one mask critical dimension (mCD); executing an exposure and development process on a testing photoresist layer using the test photo mask to form a plurality of second hole patterns corresponding to the first hole patterns; measuring photoresist critical dimensions (pCDs) of the second hole patterns on the test photoresist layer; determining correction of the mCDs for each combination of the pCDs and the pitches; performing a first correction for at least one side of at least one contact hole of a processing mask pattern based on the correction of the mCDs; and performing a second correction of the contact hole of the processing mask pattern to a square having the same area as the first corrected contact hole and having the same center as the uncorrected contact hole.