Patent ID: 6214497
Filing Date: 2001-04-10
Classification: G03F

Abstract:
A method of forming a phase shift mask for use in wafer fabrication, said method comprising the steps of:coating a transparent substrate layer with a partially light transmissive material; andcoating said partially light transmissive material with an opaque material in a first side lobe region corresponding to a background of attenuating portions that would otherwise be associated with a side lobe, wherein a coating pattern of said partially light transmissive material is determined by:modifying a circuit design corresponding to an original pattern of said partially light transmissive material to include the opaque material in the first side lobe region, andcorrecting the design having the opaque material placed therein to form a corrected design corresponding to the coating pattern and to ensure that circuit features of the coating pattern print in accordance with the original pattern and without side lobes.