Patent ID: 7297669

Claim:
A method of modifying a surface of a wafer, via abrasive removal of material, suited for fabrication of a copper based semiconductor device comprising the steps of: a. providing a wafer comprising a first material having a surface etched to form a pattern and a second material deposited over the surface of the first material; b. contacting the second material of the wafer with polishing pad in the presence of a working slurry; and c. relatively moving the wafer or polishing pad, to abrasively remove material, while the second material is in contact with a polishing pad until an exposed surface of the wafer is planar and comprises at least one area of exposed first material and one area of exposed second material, wherein the working slurry is comprised of: (a) a sulfonated zwitterions, (b) an oxidizing agent, (c) a liquid carrier, (d) optionally, inorganic polishing particles, (e) optionally, a chelating agent, (f) optionally, a secondary buffering agent, (g) optionally, a passivating agent, (h) optionally, surfactants, viscosity modifiers, wetting agents, lubricants, soaps, and the like, and (i) optionally, a stopping compound.