Patent ID: 6612159
Filing Date: 2003-09-02
Classification: G03F,H01L

Abstract:
A method for forming a target used to simultaneously measure registration relative to each other of more than two layers of a semiconductor wafer, comprising:forming at least first, second and third layers which overlay each other; providing a first pattern in a designated location of said first layer; providing a second pattern in a designated location of said second layer, said second pattern having a given shape and a given size, and having at least one discontinuity formed therein at a predetermined location; and providing a third pattern in a designated location of said third layer, said third pattern having said given shape and said given size of said second pattern, and having at least one discontinuity formed therein at a predetermined location, wherein a portion of each one of said second and third patterns fits within the at least one discontinuity in the other when the second and third layers are in registration with each other.