Patent ID: 7842191

Claim:
A polishing method comprising: contacting a semiconductor substrate having a metallic film with a polishing pad attached to a turntable; and supplying a metallic film-CMP slurry having a viscosity of less than 2 mPa·sec onto the polishing pad to polish the metallic film, the metallic film-CMP slurry comprising: water; 0.01 to 0.3 wt %, based on a total quantity of the slurry, of polyvinylpyrrolidone having a weight average molecular weight of not less than 40,000; an oxidizing agent; a protective film-forming agent containing a first complexing agent for forming a water-insoluble complex and a second complexing agent for forming a water-soluble complex, the first complexing agent containing quinaldinic acid, quinolinic acid, and alkylbenzene sulfonate; and colloidal silica having a primary particle diameter ranging from 5 to 50 nm.