Patent ID: RE39126

Claim:
A method of producing a conductive plug in an insulation layer, comprising the steps of: a) removing a portion of the insulation layer to form a contact hole within the insulation layer; b) applying a layer of conductive material to a surface of the insulation layer, thereby filling said contact hole with said conductive material and resulting in a layer of said conductive material over said insulation layer surface; c) removing at least a portion of said conductive material from said surface of the insulation layer and leaving said contact hole substantially filled with said conductive material, said removing being performed by chemical mechanical planarization with a slurry comprising an abrasive material and an oxidizing component, said oxidizing component comprising hydrogen peroxide and water wherein a ratio by volume of hydrogen peroxide to water is in the range of 1:0 to 1:1; d) removing some of the insulation layer to lower said insulation layer surface with respect to an upper surface of said conductive material.