Patent ID: 7924405
Filing Date: 2011-04-12
Classification: G03F

Abstract:
1. A method for lithography patterning, comprising: providing a mask for photolithography patterning; measuring a mask flatness of the mask using one of liquid crystal display imaging and optical reflection; calculating a focal deviation of imaging the mask to a substrate in a lithography apparatus, wherein the focal deviation is calculated using measured mask flatness data from a main pattern region of the mask, and wherein the calculating of the focal deviation comprises utilizing a linear fit, wherein the linear fit comprises a regression equation of f=a*m+b in which f stands for the focal deviation, m stands for the mask flatness, and a and b are constant parameters; adjusting the lithography apparatus to have a compensated focal plane of the mask based on the focal deviation; and exposing the semiconductor substrate utilizing the mask and the lithography apparatus with the adjusted focal plane.