Patent ID: 6492097
Filing Date: 2002-12-10
Classification: G03F

Abstract:
A method for increasing a line width window of a semiconductor process, the method comprising:forming a positive photoresist layer on a substrate; using a first photomask to conduct a first exposure step on the positive photoresist layer, wherein the first photomask is designed to have at least one main line that is opaque, two scattering bars arc formed on each of two sides of the main line, respectively, and a width of each scattering bar is greater than one third of a wavelength of a light source used during exposure and less than a width of the main line so that proximity effects of the first exposure step is compensated; and using a second photomask to conduct a second exposure step on the positive photoresist layer, wherein the second photomask is designed to have at least two iso-lines, wherein the two iso-lines are located in two positions respectively corresponding to the two scattering bars of the first photomask, a width of each iso-line is greater than that of the corresponding scattering bar so that the positive photoresist layer is easily removed during a subsequent photoresist stripping process.