Patent ID: 8025759
Filing Date: 2011-09-27
Classification: B24B,H01L

Abstract:
1. A polishing method comprising: measuring a thickness of a film formed on a substrate; inputting a desired thickness of a film formed on a substrate to be polished; storing polishing rate data on at least two lately polished substrates in a storage device; calculating a polishing rate and an optimal polishing time based on the polishing rate data and the desired thickness by using a weighted average method which weights the polishing rate data on the at least two lately polished substrates; and polishing a subsequent substrate for the optimal polishing time, wherein the weighted average method includes setting a weight coefficient for each lately polished substrate, and wherein the weight coefficient for a most recently polished substrate of the at least two lately polished substrates is larger than the weight coefficient for a less recently polished substrate of the at least two lately polished substrates.