Wafer inspection systems and methods for analyzing inspection data
First Claim
1. An inspection system, comprisingan illumination subsystem configured to direct light to a wafer;
- two or more low resolution electronic sensors arranged at multiple viewing angles, wherein the two or more sensors are configured to detect light returned from the wafer substantially simultaneously; and
a processor configured to detect defects on the wafer using output generated by the two or more sensors, wherein the processor is further configured to determine which of the two or more sensors produces images with the largest sensitivity to defocus defects, and wherein the processor is further configured to select the images with the largest sensitivity for use in defect detection.
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Accused Products
Abstract
Wafer inspection systems and methods are provided. One inspection system includes a module measurement cell coupled to a host inspection system by a wafer handler. The module measurement cell is configured to inspect a wafer using one or more modes prior to inspection of the wafer by the host inspection system. The one or more modes include backside inspection, edge inspection, frontside macro defect inspection, or a combination thereof. Another inspection system includes two or more low resolution electronic sensors arranged at multiple viewing angles. The sensors are configured to detect light returned from a wafer substantially simultaneously. A method for analyzing inspection data includes selecting a template corresponding to a support device that contacts a backside of a wafer prior to inspection of the backside of the wafer. The method also includes subtracting data representing the template from inspection data generated by inspection of the backside of the wafer.
31 Citations
32 Claims
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1. An inspection system, comprising
an illumination subsystem configured to direct light to a wafer; -
two or more low resolution electronic sensors arranged at multiple viewing angles, wherein the two or more sensors are configured to detect light returned from the wafer substantially simultaneously; and a processor configured to detect defects on the wafer using output generated by the two or more sensors, wherein the processor is further configured to determine which of the two or more sensors produces images with the largest sensitivity to defocus defects, and wherein the processor is further configured to select the images with the largest sensitivity for use in defect detection. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification