Patent ID: 7144301
Filing Date: 2006-12-05
Classification: B24B,C09G

Abstract:
1. A method of planarizing an integrated circuit material, comprising: dispensing a first slurry for performing a first planarization of the integrated circuit material in a first chemical mechanical polishing process using the first slurry; dispensing a second slurry for performing a second planarization of the integrated circuit material in a second chemical mechanical polishing process using the second slurry, wherein the first slurry is comprised of a first abrasive material that is different from a second abrasive material comprising the second slurry; determining a concentration of a planarity selective additive in the second slurry that results in an inflection point in a non-linear plot of removal rate of the integrated circuit material versus a load of a polishing driving motor used in the second chemical mechanical polishing process; wherein the second slurry includes the planarity selective additive with the concentration resulting in the non-linear plot; and stopping the second planarization when the load of the polishing driving motor is greater than a threshold point being said inflection point.