Patent ID: 7786023

Claim:
A method for forming a metal pad on a substrate, comprising: (a) forming a first metal and a first pad metal separated from each other on the substrate, wherein the first pad metal is wider than the first metal; (b) depositing a dielectric layer on the first metal, the first pad metal and the substrate; (c) forming a first opening and a second opening in the dielectric layer to respectively expose the first metal and the first pad metal; (d) depositing a conductive layer on the dielectric layer to fill the first opening and the second opening; (e) performing a chemical mechanic polishing (CMP) operation on the conductive layer to clear out the conductive layer on the dielectric layer and expose a surface of the dielectric layer; (f) performing an etching back process to clear out all the conductive layer in the second opening to expose the first pad metal; and (g) forming a second pad metal covering the first pad metal, wherein the first pad metal and the second pad metal form the metal pad.