Patent ID: 9640509
Date: 2017-05-02
CPC Classifications: H01L

Claim:
1. A three-dimensional (3D) bonded semiconductor structure comprising: a first semiconductor structure comprising a first dielectric material layer, wherein the first dielectric material layer comprises at least a first U-shaped metal liner lining a first opening present in the first dielectric material layer and a first metallic structure having a convex outermost surface present in the first opening and in direct contact with the first U-shaped metal liner; and a second semiconductor structure comprising a second dielectric material layer, wherein the second dielectric material layer comprises at least a second U-shaped metal liner lining a second opening present in the second dielectric material layer and a second metallic structure having a concave outermost surface present in the second opening and in direct contact with the second U-shaped metal liner, wherein a metal-to-metal bonding interface is present between the convex outermost surface of the first metallic structure and the concave outermost surface of the second metallic structure.