Patent ID: 7365324
Filing Date: 2008-04-29
Classification: G01N,H01J,H01L

Abstract:
1. A method of inspecting a substrate having patterns formed in dies arranged in a matrix using electrons, comprising the steps of: placing said substrate on a stage with its direction specified; selecting a reference die as a positioning criterion and acquiring a template image for pattern-matching including the coordinates of a feature point of the reference die; using said template image to perform pattern-matching for any die existing in a row or column including said reference die, and acquiring the feature point coordinates of said any die; calculating a slip angle formed by the row or column including said reference die and a direction in which said substrate is scanned with said electrons, based on the feature point coordinates of said any die and said reference die; moving said stage so as to correct said slip angle to align said substrate; irradiating an electron beam to said substrate; detecting electrons having information of the surface of said substrate irradiated with said electron beam by a detector; acquiring an image of said pattern based on said detected electrons; and inspecting the image of said pattern.