Patent ID: 6558852
Filing Date: 2003-05-06
Classification: G03F

Abstract:
An exposure method comprising:forming, in a shot area of rectangular or square shape on a reticle, device patterns being congruent with one another and being correctly superposed one upon another by making only a parallel translation of the device patterns with perpendicular on a first side of the shot area, a first mark having a first aligning point and formed outside the device patterns in the vicinity of the first side of said shot area, and a second mark having a second aligning point and formed outside the device patterns in the vicinity of a second side of the shot area opposite to the first side, identified by a first straight line connecting the first aligning point and a second aligning point being perpendicular to the first side, being distinguishable from said first mark and identified by a distance between the first aligning point and the second aligning point being an integer multiple of a distance of the parallel translation; transferring the first mark and the second mark from the reticle onto a wafer through exposure and development processes using an exposure system; measuring arrangement errors according to the first mark and the second mark on the wafer; calculating four error components from the measured arrangement errors; and correcting the exposure system according to the calculated error components.