Patent ID: 7671990
Filing Date: 2010-03-02
Classification: G03F

Abstract:
1. A cross hashed overlay metrology mark for use in obtaining overlay metrology information during a semiconductor substrate inspection process, the mark comprising: a substrate including a plurality of target regions; a first grating structure formed in a first layer of a first target region of the plurality of target regions where the first layer includes a second grating structure formed in a second layer of the first target region wherein periodic features of the second grating structure are oriented substantially orthogonal to periodic features of the first grating to form a cross-hatched metrology target in the first target region, where the second layer includes an eighth target portion comprising a plurality parallel periodic features arranged to form an eighth grating that is arranged above and in substantial registry with the sixth grating so that the periodic features of the eighth grating are oriented substantially orthogonally to the parallel periodic features of the sixth grating to form a fourth cross hatched target, wherein the targeting arrangement is configured in four quadrants, where each of the first, second, third, and fourth cross hatched targets are formed in associated first, second, third, and fourth quadrants of the targeting arrangement.