Patent ID: 9595493
Date: 2017-03-14
CPC Classifications: H01L

Claim:
1. A method, comprising: providing a starting metallization structure, the starting metallization structure comprising a bottom layer of dielectric material with a via therein, wherein the via lacks penetration through the bottom layer of dielectric material, the semiconductor metallization structure further comprising a liner lining the via and extending over upper edges thereof, the lined via over filled with a conductive material, wherein the liner comprises an outer liner and an inner liner over the outer liner; recessing the conductive material down to a top surface of the outer liner; further selectively recessing the conductive material below the upper edges of the via without damaging the liner; and forming a liner material cap over the inner liner and the conductive material, wherein the liner material cap comprises a liner material of the inner liner, and wherein a top surface of the liner material cap is coplanar with a top surface of the bottom dielectric layer.