Patent ID: 7915169

Claim:
A process of forming an electronic device comprising: providing a workpiece comprising a substrate, an interlevel dielectric overlying the substrate, a refractory-metal-containing layer over the interlevel dielectric, and a first metal-containing layer over the refractory-metal-containing layer, wherein the first metal-containing layer includes a metal element other than a refractory metal element; and polishing the first metal-containing layer and the refractory-metal-containing layer as a continuous action to expose the interlevel dielectric, wherein: polishing the first metal-containing layer and the refractory-metal-containing layer is performed using a selectivity agent, wherein the selectivity agent improves a selectivity of a removal rate of the first metal-containing layer or the refractory-metal-containing layer to a removal rate of the interlevel dielectric; and the selectivity agent comprises a heteroaromatic polymer.