Patent ID: 6368980
Filing Date: 2002-04-09
Classification: G03F,H01L

Abstract:
A method for manufacturing a semiconductor wafer having a resist mark for measuring the accuracy of overlay of a photomask disposed on the semiconductor wafer, comprising:forming a first layer on the semiconductor wafer; forming a first rectangularly shaped opening in the first layer to make a first measurement mark; forming an intermediate layer on the first measurement mark and in the first opening; forming a second layer on the intermediate layer; forming a second measurement mark and a third measurement mark by forming a second rectangularly shaped opening and a frame-shaped opening in the second layer, the second rectangularly shaped opening being located above the first opening, the second measurement mark being isolated form the third measurement mark by the frame-shaped opening; wherein the second measurement mark is formed in a frame-shaped; and wherein the second measurement mark has a width which is short enough not to be influenced by a deformation caused by the thermal flow phenomenon.