Patent ID: 8747687
Filing Date: 2014-06-10
Classification: C09G,C09K,H01L

Abstract:
1. An aqueous polishing agent, comprising: solid polymer particles as an abrasive, finely dispersed in an aqueous phase, a first organic non-polymeric compound as a hard complexing agent, dissolved in the aqueous phase, and a second organic non-polymeric compound as a soft complexing agent, dissolved in the aqueous phase, wherein the solid polymer particles comprise a functional group that is a side or terminal group capable of interacting with a metal of, a metal oxide on top of, or the metal of and the metal oxide on top of a surface to be polished and capable of forming a strong complex with the metal of the surface to be polished, the functional group being at least one group selected from the group consisting of a primary amino group, a secondary amino group, a tertiary amino group, and a quaternary ammonium group, and wherein the solid polymer particles comprise a cross-linked polymer comprising at least one polymer chain selected from the group consisting of a polymer obtained by anionic, cationic, or radical polymerization of an olefinically unsaturated monomer, the first organic non-polymeric compound is capable of interacting with the metal of, the metal oxide on top of, or both the metal of and the metal oxide on top of the surface to be polished, capable of forming a strong, water-soluble complex with the metal, and capable of causing an increase of a material removal rate MRR and a static etch rate SER of the surface to be polished with increasing concentration of the first organic non-polymeric compound in the aqueous polishing agent, and the second organic non-polymeric compound is capable of interacting with the metal of, the metal oxide on top of, or both the metal of and the metal oxide on top of the surface to be polished, capable of forming a slightly soluble or insoluble complex with the metal of the surface to be polished, and capable of causing a lower increase of the material removal rate MRR than the first organic non-polymeric compound and a lower increase of the static etch rate SER than the first organic non-polymeric compound or no increase of the static etch rate SER of the metal surface to be polished with increasing concentration of the second organic non-polymeric compound in the aqueous polishing agent, and wherein the slightly soluble or insoluble complex is capable of being absorbed by the metal surface to be polished.