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

Claim 0:
1. A method for forming a semiconductor device, comprising:
forming a first device layer on a first substrate;
forming a first bonding layer comprising a first bonding contact and a first bonding alignment mark above the first device layer;
forming a second device layer on a second substrate;
forming a second bonding layer comprising a second bonding contact and a second bonding alignment mark above the second device layer;
aligning the first bonding alignment mark with the second bonding alignment mark, such that the first bonding contact is aligned with the second bonding contact; and
bonding the first substrate and the second substrate in a face-to-face manner, so that the first bonding contact is in contact with the second bonding contact at a bonding interface, and the first bonding alignment mark is in contact with the second bonding alignment mark at the bonding interface,
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.