Patent ID: 7799688
Filing Date: 2010-09-21
Classification: C09G,C23F,H01L

Abstract:
1. A polishing method for polishing a material comprising: a substrate, an interlaminar insulating film on said substrate, wherein a surface of said interlaminar insulating film comprises dented portions and projected portions, a barrier conductor layer coated along said surface of said interlaminar insulating film, wherein said barrier conductor layer comprises dented portions and projected portions corresponding to the dented portions and projected portions of said interlaminar insulating film, a conductive substance layer coated on said barrier conductor layer, wherein said conductive substance layer fills the dented portions of said barrier conductor layer and covers the projected portions of said barrier conductor layer, said method comprising: a first polishing step of polishing said conductive substance layer to expose projected portions of said barrier conductor layer; and a second polishing step of chemically polishing and mechanically polishing at least the exposed projected portions of said barrier conductor layer and the conductive substance layer while supplying a polishing slurry to expose the interlaminar insulating film at locations corresponding to the projected portions of said interlaminar insulating film, with conductive substance layer at the dented portions of said barrier conductor layer remaining; said polishing slurry comprising: a metal-oxidizing agent; a metal anticorrosive agent; an oxidized metal dissolving agent; and water, wherein the oxidized metal dissolving agent is at least one kind selected from the group consisting of an acid in which the negative value of the logarithm of the dissociation constant Ka (pKa) of a first dissociable acid group is 3.5 or more, an ammonium salt of the acid and an organic acid ester of the acid, the pH of the polishing slurry is within the range of 3 to 4, and the concentration of the metal-oxidizing agent is within the range of 0.01 to 3 percent be weight.