Patent ID: 7981483
Filing Date: 2011-07-19
Classification: H01J,H01L

Abstract:
1. A method of forming a phosphorus-doped layer, the method comprising: planarizing a top surface of a workpiece to form a substantially planar surface with a plurality of copper conductive paths and a plurality of dielectric regions; infusing phosphorus dopant into and below the planarized top surface of the workpiece using a gas cluster ion beam system to form a phosphorous-doped layer from the top surface to a desired depth of about 50-200 angstroms beneath the top surface in the plurality of copper conductive paths and the plurality of dielectric regions wherein the presence of the phosphorus dopant in the phosphorous-doped layer is effective to getter metal contaminants in the plurality of dielectric regions and to minimize electromigration in the plurality of copper conductive paths; and forming a barrier layer over the phosphorous-doped layer to minimize material transfer from the phosphorous-doped layer formed in the plurality of copper conductive paths and dielectric regions.