Patent ID: 8232209

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; wherein the selectivity agent comprises a polypyrrole, a polythiophene, a polyfuran, or poly(4-ethylpyridine-1-oxide).