Inventors:
Christopher E. Brannon - Pflugerville TX, US
Michael Wedlake - Austin TX, US
Chris A. Nauert - Austin TX, US
Assignee:
Spansion LLC - Sunnyvale CA
International Classification:
H01L 21/302
Abstract:
A process of forming an electronic device can include providing a workpiece. The workpiece can include 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. The first metal-containing layer can include a metal element other than a refractory metal element. The process further includes polishing the first metal-containing layer and the refractory-metal-containing layer as a continuous action to expose the interlevel dielectric. In one embodiment, the metal element can include copper, nickel, or a noble metal. In another embodiment, polishing can be performed using a selectivity agent to reduce the amount of the interlevel dielectric removed.