Patent ID: 6410357
Filing Date: 2002-06-25
Classification: H01L

Abstract:
A method of monitoring critical dimension deviation, used for a substrate having a plurality of dies and a test region between the dies, the method comprising steps of:forming a base layer on a portion of the substrate within the test region, and simultaneously forming a patterned base layer on the substrate within each of the dies, the base layer and the patterned base layer being made of same material and having same thicknesses, wherein a region outside the base layer within the test region being defined as a lower region; forming a patterned critical material layer covering the dies and the test region with equal uniform thickness, wherein the critical material layer on each of the die comprises a die pattern, the critical material layer on the base layer within the test region comprises a first test pattern, and the critical material layer on the lower region comprises a second test pattern, and the die pattern, the first and second test pattern are obtained from a die photomask pattern, a first test photomask pattern and a second test photomask pattern with equal pattern width; measuring critical dimensions of the first and the second test patterns; and comparing the measured critical dimensions of the first and the second test patterns for obtaining deviations in the critical dimensions of the die patterns.