Patent ID: 6602436
Filing Date: 2003-08-05
Classification: B24B,C09G

Abstract:
A method for chemical-mechanical planarization of a metal layer on a semiconductor wafer, comprising:i. affixing the wafer in a rotatable carrier of a polishing machine, and rotating the carrier at a rotational carrier speed, CS; ii. affixing a polishing pad to a rotatable platen of the polishing machine, and rotating the platen at a rotational platen speed, PS, wherein the ratio of PS to CS is in a range of 2:1 to 10:1 and iii. contacting the wafer and the polishing pad with a fixed down force while maintaining relative motion therebetween, while dispensing a polishing fluid at an interface of the wafer and the polishing pad, the polishing fluid containing less than 0.01 weight percent abrasives, to provide a planarized surface of the wafer.