Patent ID: 6899821

Claim:
A polishing solution for polishing a metal film surface, comprising: (1) an additive which is capable of etching the metal film surface at an etching rate of 10 nm/minute or lower, (2) a protective film-forming agent which, in combination with said additive, is capable of removing the metal film surface by chemical mechanical polishing at a polishing rate of at least 100 nm/minute and an etching rate of not more than 10 nm/minute, and (3) water, wherein said additive is a combination of a first material which is an oxidizer of metal of the metal film surface, thereby forming an oxide of the metal, a second material which dissolves the oxide of the metal, and another protective film-forming agent (a) having properties different from those of said protective film-forming agent, and (b) exhibiting an effect of controlling the etching rate to not more than 10 nm/minute without incorporating said protective film-forming agent, said protective film-forming agent and said another protective film-forming agent to a ether controlling etching rate, while maintaining chemical mechanical polishing rate, of the metal film surface, to be the polishing rate of at least 100 nm/minute and the etching rate of not more than 10 nm/minute.