Patent ID: 7268000
Filing Date: 2007-09-11
Classification: B24B

Abstract:
1. A method of controlling a chemical mechanical polishing of substrates, the method comprising: obtaining a first sensitivity parameter quantitatively describing a relationship between an overpolish time for a first material layer and a control variable related to the first material layer; obtaining a second sensitivity parameter quantitatively describing a relationship between a control variable related to a second material layer and a control variable related to a second material layer of a preceding substrate; calculating the overpolish time of the first material layer from a linear model of the chemical mechanical polishing process, wherein the model at least includes the control variable related to the second material layer, the first sensitivity parameter, the second sensitivity parameter, a command value for the first material layer, the overpolish time of the second material layer, the control variable related to the second material layer, and the control variable related to the second material layer of the preceding substrate; calculating a weighted moving average of the overpolish time of the first material layer; and adjusting the overpolish time for the first material layer during the chemical mechanical polishing of the substrate corresponding to the calculated overpolish time.