Patent ID: 11955454
Assignee: YANGTZE MEMORY TECHNOLOGIES CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 6:
7. The method of claim 1, wherein the first alignment mark comprises a first alignment reference point, and the second alignment mark comprises a second alignment reference point; and
the relative position between the first alignment mark and the second alignment mark satisfying the predetermined bonding condition comprises at least:
a first distance between the first alignment reference point and the second alignment reference point in a first direction being less than or equal to a first distance threshold; or
a second distance between the first alignment reference point and the second alignment reference point in a second direction being less than or equal to a second distance threshold;
wherein the first direction and the second direction are parallel to at least the surface of the first wafer or the surface of the second wafer; the first direction is perpendicular to the second direction.