Patent ID: 6424417
Filing Date: 2002-07-23
Classification: G03F

Abstract:
A method for automatic optical control of at least one of exposure and focus parameters of an exposure tool in a photolithography arrangement to be applied to a workpiece coated with a photoresist layer, the method comprising the steps of:(a) applying a measuring tool comprising a spectrophotometer to the workpiece prior to processing of the workpiece by the exposure tool; (b) measuring at least one parameter of the workpiece and generating measured data representative thereof, said at least one parameter of the workpiece being a parameter defining said at least one of the exposure and focus parameters of the exposure tool to enable obtaining desired parameters of the workpiece by exposing the workpiece with the exposure tool; and (c) analyzing said measured data and determining a required value of said at least one of the exposure and focus parameters of the exposure tool to provide said desired parameters of the workpiece resulting from applying the exposure tool to said workpiece;.