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

Claim 11:
12. A method comprising:
forming a first package component comprising:
depositing 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
after the first metal pad is formed, depositing a fill-in metal layer extending into a recess of the first metal pad, wherein the fill-in metal layer comprises a second metallic material different from the first metallic material;

bonding a second package component to the first package component, wherein the fill-in metal layer forms an alloy with an additional fill-in metal in the second package component, and wherein the second package component comprises:
a second dielectric layer bonded to the first dielectric layer to form a first interface; and
a second metal pad in the second dielectric layer, wherein the second metal pad is in contact with the first metal pad to form a second interface parallel to the first interface, and wherein the alloy separates the second interface from a respective closest edge of the first metal pad.