Patent ID: 8038898

Claim:
A polishing method, comprising: polishing a metal film, formed on a surface of an object to be polished, with a polishing pad, to remove at least part of the metal film, in a polishing solution which comprises: oxidizing agent; oxidized-metal dissolving agent; at least one first material selected from the group consisting of benzotriazole and a derivative thereof, the at least one first material being a protective film-forming agent; at least one second material selected from the group consisting of polyacrylic acids, polymethacrylic acids, polyamic acids, ammonium polyacrylates, ammonium polymethacrylates, and ammonium polyamides, wherein said at least one second material includes at least one of (a) at least one polyamic acid and (b) at least one ammonium polyamide; and water, wherein said at least one first material is included in the polishing solution in an amount of from 0.0001 mol to 0.05 mol, based on 100 g of the oxidizing agent, the oxidized-metal dissolving agent, the first and second materials and water, and wherein said at least one second material is included in said polishing solution in an amount of 0.001% to 0.3% by weight, based on 100 g of the oxidizing agent, the oxidized-metal dissolving agent, the first and second materials and water.