Patent ID: 6710852
Filing Date: 2004-03-23
Classification: G03F

Abstract:
A method of wafer exposure with correction feedback comprising the steps of:providing a first and second wafer; using a first group of parameters to expose the first wafer to transfer a pattern of a first layer to the first wafer; using a second group of parameters to perform overlay alignment of the pattern of the first layer with a pattern of a second layer for the first wafer; performing measurement of the first wafer to obtain a first and second correction respectively for the first and second group of the parameters; correcting the first group of the parameters with the first correction and using the first group of the corrected parameters to expose the second wafer to transfer the pattern of the first layer to the second wafer; and correcting the second group of the parameters with the second correction and using the second group of the corrected parameters to perform overlay alignment of the pattern of the first layer with the pattern of the second layer for the second wafer.