Patent ID: 7465668

Claim:
A method for manufacturing a semiconductor device, comprising: depositing a barrier metal above an insulating film formed above a semiconductor substrate and having a recess; depositing a wiring material film on the barrier metal; polishing the wiring material film while feeding a first chemical solution containing abrasive particles and a second chemical solution containing an oxidizing agent over a polishing pad, thereby exposing the barrier metal, the wiring material film being in contact with the polishing pad at a first load; subsequent to the polishing of the wiring material film, subjecting a surface of the wiring material film to a chemical-polishing by continuing the feeding of the first chemical solution over the polishing pad while suspending the feeding of the second chemical solution, the wiring material film being in contact with the polishing pad at a second load which is smaller than the first load; after the chemical-polishing of the wiring material film, polishing the barrier metal while feeding a first chemical solution containing abrasive particles and a second chemical solution containing an oxidizing agent over a polishing pad, thereby exposing the insulating film while leaving the wiring material film and the barrier metal in the recess, the barrier metal being in contact with the polishing pad at a first load; and subsequent to the polishing of the barrier metal, subjecting a treating film including the wiring material film and the barrier metal left in the recess to a chemical-polishing by continuing the feeding of the first chemical solution over the polishing pad while suspending the feeding of the second chemical solution, the treating film being in contact with the polishing pad at a second load which is smaller than the first load applied when the barrier metal is polished.