Patent ID: 11967535
Assignee: KLA CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 0:
1. A product, comprising:
a semiconductor substrate;
at least first and second thin-film layers disposed on the substrate and patterned to define a matrix of dies, which are separated by scribe lines and contain active areas circumscribed by the scribe lines; and
a plurality of overlay targets formed in the first and second thin-film layers within each of the active areas, each overlay target having dimensions no greater than 10 μm×10 μm in a plane parallel to the substrate and comprising:
a first linear grating formed in the first thin-film layer and having a first grating vector; and
a second linear grating formed in the second thin-film layer, in proximity to the first linear grating, and having a second grating vector parallel to the first grating vector.