Patent ID: 11894241
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. A method comprising:
forming a first package component comprising:
forming a first dielectric layer;
forming a first metal pad in the first dielectric layer, wherein the first metal pad comprises a first metallic material; and
depositing a first fill-in metal layer on the first metal pad, wherein an entirety of the first fill-in metal layer is formed of a homogeneous material;

forming a second package component comprising:
forming a second dielectric layer;
forming a second metal pad in the second dielectric layer, wherein the second metal pad comprises a second metallic material; and
depositing a second fill-in metal layer on the second metal pad; and

bonding the first package component to the second package component, wherein a first portion of the first fill-in metal layer forms an alloy layer with the second fill-in metal layer, and a second portion of the first fill-in metal layer separates the alloy layer from the first metal pad.