Patent ID: 6350994
Filing Date: 2002-02-26
Classification: H01L

Abstract:
A structure of a critical dimension bar formed on a test region between a plurality of dies of a substrate, each of the dies being divided into a plurality of higher areas and a plurality of lower areas with respect to the higher areas, wherein, a height difference is formed between the higher and the lower areas, and a top surface of the substrate within the lower areas is the same level as a top surface of the substrate within the test region, the structure comprising;a base layer on a portion of the substrate within the test region, the base layer having a thickness same as the height difference, and a region outside the base layer within the test region being defined as a lower region; and 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.