Patent ID: 6062958
Filing Date: 2000-05-16
Classification: B24B,B24D

Abstract:
In the manufacturing of electronic devices with integrated circuits, a method for planarizing a substrate with microelectronic components, comprising:continuously pressing the substrate against a first abrasive region of an abrasive polishing pad and a second abrasive region of the abrasive polishing pad contemporaneously, the first abrasive region having a first abrasiveness and the second abrasive region having a second abrasiveness different than the first abrasiveness; andmoving at least one of the polishing pad and the substrate with respect to the other to impart relative motion therebetween and intermittently contacting areas on the substrate with the first and second abrasive regions, wherein the polishing pad is circular, the first planarizing region is positioned radially outwardly from the second planarizing region, the first abrasiveness is greater than the second abrasiveness, and at least one of the polishing pad and the substrate rotates to create a relative velocity gradient between the substrate and the polishing pad having a first relative velocity zone and a second relative velocity zone with a greater relative velocity than the first relative velocity zone, and wherein the pressing step comprises positioning the substrate against the polishing pad to locate the first relative velocity zone over the first planarizing region and the second relative velocity zone over the second planarizing region.