Patent ID: 6210841
Filing Date: 2001-04-03
Classification: G03F

Abstract:
A mask used to form images on an integrated circuit wafer, comprising:a transparent mask substrate having a first pattern region and a second pattern region;an opaque first pattern formed on said transparent mask substrate in said first pattern region, wherein said first pattern is formed of opaque material directly over attenuating phase shifting material and comprises a first number of parallel first lines having a first line width and a first duty ratio and wherein said first duty ratio is the ratio of said first line width to the distance between adjacent said first lines;a second pattern formed from said attenuating phase shifting material on said transparent mask substrate in said second pattern region, wherein said second pattern comprises a second number of parallel second lines having a second line width and a second duty ratio, and said second duty ratio is the ratio of said second line width to the distance between adjacent said second lines; andscattering bars formed from said attenuating phase shifting material in said second pattern region, wherein there is one of said scattering bars on either side of each of said second parallel second lines.