Patent ID: 11973045
Assignee: CHANGXIN MEMORY TECHNOLOGIES, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 11:
12. A method for forming a semiconductor structure, comprising:
providing a first substrate, a first opening being formed on a surface of the first substrate; and
forming a first bonding structure in the first opening, the first bonding structure comprising a first metal layer and a second metal layer with a melting point lower than that of the first metal layer; wherein said forming the first bonding structure comprises: forming the first metal layer in the first opening, the first metal layer comprising a first surface in contact with a bottom surface of the first opening and a second surface opposite to the first surface; forming a first groove on the second surface, an area, not occupied by the first metal layer and the first groove, of the first opening constituting a second groove; forming a third groove below the first groove of the first metal layer, wherein a projection of the first groove on the first surface falls within a projection of the third groove on the first surface, a projection of the second groove on the first surface coincides with the projection of the third groove on the first surface; and forming the second metal layer in the first groove, the second groove and the third groove, a surface, exposed from the second groove, of the second metal layer constituting a bonding surface of the first bonding structure.