Patent ID: 6447371
Filing Date: 2002-09-10
Classification: C09G,C23F,H01L

Abstract:
A method for polishing a substrate including a copper portion and a Ta portion comprising:applying a first aqueous chemical mechanical polishing slurry comprising at least one abrasive, at least one oxidizing agent, at least one complexing agent, and at least one organic amino compound to a substrate including a copper portion and a tantalum portion; removing at least a portion of the copper portion from the substrate by bringing a pad into contact with the substrate and moving the pad in relation to the substrate to give a partially polished substrate including a copper portion and a tantalum portion; applying a second slurry comprising at least one abrasive, at least one oxidizing agent, and at least one complexing agent wherein the weight ratio of oxidizing agent to complexing agent is greater than about 10 to the partially polishing substrate; removing a least a port of the tantalum portion from the substrate by bringing a pad into contact with the substrate and moving the pad in relation to the substrate to give a polished substrate.