Patent ID: 11876049
Assignee: YANGTZE MEMORY TECHNOLOGIES CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 8:
9. A method for determining a degree of alignment of a bonded structure, comprising:
forming a first bonding layer comprising a first bonding contact and a first bonding alignment mark;
forming a second bonding layer comprising a second bonding contact and a second bonding alignment mark;
bonding the first bonding layer and the second bonding layer in a face-to-face manner at a bonding interface;
measuring a degree of alignment between the first bonding alignment mark and the second bonding alignment mark; and
determining a degree of alignment between the first bonding contact and the second bonding contact based on the measured degree of alignment between the first bonding alignment mark and the second bonding alignment mark,
wherein at least one of the first and second bonding alignment marks comprises a plurality of repetitive patterns, each of the repetitive patterns consisting of a metal region and a dielectric region between two adjacent metal regions; and
a size of the metal region is not greater than about 25% of a size of the respective repetitive pattern.