Patent ID: 8652295
Filing Date: 2014-02-18
Classification: B24B,H01L

Abstract:
1. A chemical mechanical polishing (CMP) apparatus, comprising: a polishing head for holding a wafer, a platen, and a polishing pad on said platen; a first inlet including a first control valve for delivering a first composition when commanded by a process controller during a first time duration onto a surface of said wafer, and a second inlet including a second control valve for delivering a second composition different from said first composition when commanded by said process controller during a second time duration after said first time duration onto said surface of said wafer, said process controller communicably coupled to control said first and said second control valves, and executing a multi-step CMP algorithm that implements a multi-step CMP comprising process including: repeating said multi-step CMP comprising process a plurality of times on said wafer.