Patent ID: 6872662
Filing Date: 2005-03-29
Classification: B24B,Y10S

Abstract:
1. A method for detecting an endpoint of a chemical mechanical polishing (CMP) process comprising: (a) setting up at least one carrier for fixing a wafer comprised of a plurality of material layers to a surface of a polishing pad; (b) rotating the wafer and the polishing pad with respect to each other, and causing the wafer to move from a first portion of the polishing pad to a second portion; (c) measuring one environmental temperature by a measuring device; (d) measuring one temperature of the portion of the polishing pad by the measuring device; (e) calculating a temperature difference between the temperature in step (c)-(d); (f) repeating step (b)-(e), and making a curve which includes a first constant value slope, a non-constant value slope, a second constant value slope; and (g) determining an endpoint of the CMP process by a turning point between the first constant value slope and the second constant value slope.