Patent ID: 7101259

Claim:
A polishing apparatus comprising: a polishing section having a turntable with a polishing surfaces, a top ring for holding a substrate and pressing the substrate against said polishing surface to polish a surface having a semiconductor device thereon, and a sensor for detecting exposure of a barrier layer on the substrate during polishing; a cleaning section for cleaning at least a polished surface of the substrate which has been polished, said cleaning section having an electrolyzed water supply device for supplying electrolyzed water to the polished surface of the substrate to form a metal-oxide film on the polished surface of the substrate and a diluted hydrofluoric acid supply device for supplying diluted hydrofluoric acid to the polished surface of the substrate to dissolve the metal-oxide film formed on the polished surface of the substrate and remove the metal-oxide film from the polished surface of the substrate; a transfer robot for transferring the substrate from said polishing section to said cleaning section after exposure of the barrier layer on the substrate is detected by said sensor; and a measuring device for monitoring pH or ion concentration of said electrolyzed water.