Patent ID: 6726319
Filing Date: 2004-04-27
Classification: G01N,H01L

Abstract:
A method for inspecting a semiconductor wafer surface, comprising:scanning a semiconductor wafer with a laser beam directed perpendicularly to said semiconductor wafer; detecting at least one of scattered and reflected light from a surface of said semiconductor wafer by multiple light optics having different detecting angles, respectively, relative to said laser beam, wherein at least one of said multiple light optics is a high-angle light optic having a detecting angle that is from 5Â° to 20Â° relative to said laser beam and at least another of said multiple light optics is a low-angle light optic having a detecting angle that is from 25Â° to 75Â° relative to said laser beam; and determining a type and approximate shape of an occurrence associated with said semiconductor wafer based on a ratio of light intensities from said multiple light optics.