Patent ID: 6412326
Filing Date: 2002-07-02
Classification: G03F

Abstract:
A calibration method of calibrating a semiconductor wafer coating system comprising:providing a semiconductor wafer having a calibration pattern; using a coating system, forming a layer of material over the calibration pattern and removing selected portions of the layer of material; and inspecting the position of unremoved portions of the layer of material relative to the calibration pattern to ascertain whether said coating system removed said selected portions within desired tolerances, and if not, calibrating said coating system, wherein said wafer has an outer edge having a shape which defines the wafer's periphery, and: the calibration pattern comprises first and second calibration edges which generally follow at least a portion of said outer edge shape, said removing of said selected portions of said layer of material defines a material edge, and said inspecting comprises determining whether said material edge is disposed in a desired position relative to said first and second edges, wherein said first and second calibration edges are disposed at different respective distances relative to said wafer's outer edge, and wherein said inspecting comprises ascertaining whether said material edge is disposed intermediate said first and second edges when viewed from over the wafer.