Patent ID: 8518817

Claim:
A method of electrolytic plating comprising: immersing an in-process substrate into an electrolytic plating solution, the in-process substrate including: a dielectric layer defining a feature; a liner over the dielectric layer and the feature; and a seed layer over the liner; rotating the in-process substrate in the electrolytic plating solution to form a first metal layer over the seed layer, wherein the first metal layer includes an excess portion above the liner and the feature; performing a first chemical-mechanical polish (CMP) to the first metal layer and the liner on the in-process substrate, wherein the excess portion is removed by the first CMP and the liner is retained on the in-process substrate, and wherein a portion of the first metal layer is retained within the feature; immersing the in-process substrate into the electrolytic plating solution after the performing of the first CMP; rotating the in-process substrate in the electrolytic plating solution after the performing of the first CMP and the immersing to form a second metal layer on the first metal layer, wherein the second metal layer is formed over the liner on the in-process substrate and directly on the portion of the first metal layer retained within the feature, and wherein the second metal layer covers the in-process substrate; and performing a second chemical-mechanical polish (CMP) on the in-process substrate to the liner on the dielectric layer, wherein a portion of the liner is retained outside of the feature, and wherein the second metal layer is shaped substantially planar relative to the liner, the second metal layer and the liner forming a substantially level surface on the in-process substrate.