Patent ID: 8501625
Filing Date: 2013-08-06
Classification: C09G,C23F,H01L

Abstract:
1. A polishing liquid for metal film comprising 7.0% by weight or more up to 20 parts by weight relative to 100 parts of the polishing liquid for metal film of hydrogen peroxide, 0.1% to 2% by weight of a water-soluble polymer based on the total weight of the polishing liquid for metal film, 0.01 to 1% by weight of an oxidized metal dissolving agent, 0.01% to 2.0% by weight of a metal anticorrosive agent and water, wherein the water-soluble polymer has a weight average molecular weight of 160,000 to 1,000,000 and is at least one member selected from the group consisting of a polyacrylic acid, a salt of a polyacrylic acid, and a polyacrylic acid ester, wherein the polishing liquid contains polishing particles comprising primary particles having an average particle diameter of up to 50 nm and secondary particles having an average particle diameter of up to 100 nm; the content of the polishing particles is 0.1% to about 1.0% by weight based on the total weight of the polishing liquid for metal film; and the polishing particles is colloidal silica, wherein the polishing liquid forms a reaction layer having a thickness of 110 nm or more, wherein the reaction layer thickness is measured by immersing a wafer comprising a silicon substrate and a copper foil with a thickness of 500 nm or more laminated on the substrate in the polishing liquid at 25° C. for 12 hours.