Patent ID: 11967058
Assignee: KLA CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 18:
19. A system, comprising:
a scanning electron microscope (SEM);
one or more processors; and
memory storing one or more programs for execution by the one or more processors, the one or more programs comprising instructions for:
obtaining, from the SEM, a SEM image of a portion of a semiconductor die showing one or more structures in a first process layer and one or more structures in a second process layer;
using machine learning, defining a first region on the SEM image that at least partially includes the one or more structures in the first process layer;
using machine learning, defining a second region on the SEM image that at least partially includes the one or more structures in the second process layer; and
using the first region and the second region, calculating an overlay offset between the one or more structures in the first process layer and the one or more structures in the second process layer.