Patent ID: 6228661
Filing Date: 2001-05-08
Classification: G03F

Abstract:
A method for determining a dark-to-clear exposure dose in a swing curve comprising the following steps:coating photoresist films with different thicknesses on a plurality of dummy wafers, respectively;performing a dark-to-clear exposure to each chips on said plurality of dummy wafers by using a mask with a pattern of critical dimension bars such that said pattern is transferred on each of said chips;developing said photoresist films;inspecting said pattern on each of said chips of said plurality dummy wafers by using an optical instrument;recording an exposure dose resulting in the complete removing of an exposed part of each of said photoresist films;depicting a curve in terms of said thicknesses of said photoresist films as the abscissa and said exposure dose resulting in the complete removing of an exposed part of each of said photoresist films as the ordinate; andchoosing a point of said curve depending on an object of the subsequent etching process.