Tuning wafer inspection recipes using precise defect locations
First Claim
1. A method for determining one or more parameters of a wafer inspection process, comprising:
- acquiring one or more optical images of an alignment target on a wafer generated by a wafer inspection system;
separating defects detected on the wafer into different groups, wherein the different groups are located proximate to different subsets of alignment targets on the wafer;
aligning the one or more optical images of the alignment target to their corresponding electron beam images generated by an electron beam defect review system;
determining different local coordinate transformations for the different subsets of the alignment targets based on results of the aligning step, wherein the local coordinate transformations define relationships between coordinates determined by the electron beam defect review system and coordinates determined by the wafer inspection system;
determining positions of the defects on the wafer in wafer inspection system coordinates based on coordinates of the defects determined by the electron beam defect review system and the different local coordinate transformations for the different groups into which the defects have been separated; and
determining one or more parameters for an inspection process for the wafer based on defect images acquired at the determined positions by the wafer inspection system, wherein acquiring the one or more optical images, separating the defects, aligning the one or more optical images, determining the different local coordinate transformations, determining the positions of the defects, and determining the one or more parameters are performed with one or more computer systems.
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Accused Products
Abstract
Systems and methods for determining one or more parameters of a wafer inspection process are provided. One method includes aligning optical image(s) of an alignment target to their corresponding electron beam images generated by an electron beam defect review system. The method also includes determining different local coordinate transformations for different subsets of alignment targets based on results of the aligning. In addition, the method includes determining positions of defects in wafer inspection system coordinates based on coordinates of the defects determined by the electron beam defect review system and the different local coordinate transformations corresponding to different groups of the defects into which the defects have been separated. The method further includes determining one or more parameters for an inspection process for the wafer based on defect images acquired at the determined positions by a wafer inspection system.
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Citations
39 Claims
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1. A method for determining one or more parameters of a wafer inspection process, comprising:
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acquiring one or more optical images of an alignment target on a wafer generated by a wafer inspection system; separating defects detected on the wafer into different groups, wherein the different groups are located proximate to different subsets of alignment targets on the wafer; aligning the one or more optical images of the alignment target to their corresponding electron beam images generated by an electron beam defect review system; determining different local coordinate transformations for the different subsets of the alignment targets based on results of the aligning step, wherein the local coordinate transformations define relationships between coordinates determined by the electron beam defect review system and coordinates determined by the wafer inspection system; determining positions of the defects on the wafer in wafer inspection system coordinates based on coordinates of the defects determined by the electron beam defect review system and the different local coordinate transformations for the different groups into which the defects have been separated; and determining one or more parameters for an inspection process for the wafer based on defect images acquired at the determined positions by the wafer inspection system, wherein acquiring the one or more optical images, separating the defects, aligning the one or more optical images, determining the different local coordinate transformations, determining the positions of the defects, and determining the one or more parameters are performed with one or more computer systems. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A non-transitory computer-readable medium, storing program instructions executable on a computer system for performing a computer-implemented method for determining one or more parameters of a wafer inspection process, wherein the computer-implemented method comprises:
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acquiring one or more optical images of an alignment target on a wafer generated by a wafer inspection system; separating defects detected on the water into different groups, wherein the different groups are located proximate to different subsets of alignment targets on the wafer; aligning the one or more optical images of the alignment target to their corresponding electron beam images generated by an electron beam defect review system; determining different local coordinate transformations for the different subsets of the alignment targets based on results of the aligning step, wherein the local coordinate transformations define relationships between coordinates determined by the electron beam defect review system and coordinates determined by the wafer inspection system; determining positions of the defects on the wafer in wafer inspection system coordinates based on coordinates of the defects determined by the electron beam defect review system and the different local coordinate transformations for the different groups into which the defects have been separated; and determining one or more parameters for an inspection process for the wafer based on defect images acquired at the determined positions by the wafer inspection system.
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21. A system configured to determine one or more parameters of a wafer inspection process, comprising:
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an optical wafer inspection system configured to acquire one or more optical images of an alignment target on a wafer and defect images for the wafer; an electron beam defect review system configured to acquire electron beam images of the alignment target; and one or more computer subsystems configured for; separating defects detected on the wafer into different groups, wherein the different groups are located proximate to different subsets of alignment targets on the wafer; aligning the one or more optical images of the alignment target to their corresponding electron beam images; determining different local coordinate transformations for the different subsets of the alignment targets based on results of the aligning step, wherein the local coordinate transformations define relationships between coordinates determined by the electron beam defect review system and coordinates determined by the optical wafer inspection system; determining positions of the defects on the wafer in wafer inspection system coordinates based on coordinates of the defects determined by the electron beam defect review system and the different local coordinate transformations for the different groups into which the defects have been separated; and determining one or more parameters for an inspection process for the wafer based on the defect images acquired at the determined positions by the wafer inspection system. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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Specification