Patent ID: 11935804
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. A method comprising:
forming a through-via over a redistribution structure, wherein forming the through-via comprises:
forming a seed layer in a first opening in a first dielectric layer of the redistribution structure;
forming a photomask layer over the seed layer and the first dielectric layer;
patterning the photomask layer to form a second opening in the photomask layer, the second opening exposing the seed layer;
plating a first conductive material layer in the second opening and on the seed layer with a first plating process, the first plating process having a first plating rate;
plating a second conductive material layer in the second opening and on the first conductive material layer with a second plating process, the second plating process having a second plating rate, the second plating rate being greater than the first plating rate; and

plating a third conductive material layer in the second opening and on the second conductive material layer with a third plating process, the third plating process having a third plating rate, the third plating rate being greater than the second plating rate.