Patent ID: 7280233

Claim:
A method for inspecting an edge exposure area of a wafer between an edge of a photoresist layer formed on the wafer and an edge of the wafer, comprising: irradiating light onto an edge portion of the wafer; measuring a reflectivity of the light reflected from the edge portion of the wafer; and selecting a peak value of the measured reflectivity corresponding to a reference reflectivity, wherein the selected peak value of the measured reflectivity corresponds to the edge of the photoresist layer; calculating a width of the edge exposure area between a position corresponding to the selected peak value and a position of the edge of the wafer; obtaining an image of the edge portion of the wafer using the reflected light; and displaying at least one of the image, the measured reflectivity, the position of the edge of the photoresist layer and the width of the edge exposure area.