Patent ID: 8431483
Filing Date: 2013-04-30
Classification: H01L

Abstract:
1. A method of alleviating defects while forming an electrically conductive plug, comprising: providing an opening within electrically insulative material over a node location on a substrate; forming a single electrically conductive material to overfill the opening and elevationally over the insulative material, the electrically conductive material physically contacting the electrically insulative material within the opening; removing some of the conductive material effective to recess an outermost surface of the conductive material from an outermost surface of the insulative material after said removing of some of the conductive material, the conductive material having an outermost surface first roughness within the opening after said removing of some of the conductive material; after removing some of the conductive material, overfilling remaining volume of the opening over the conductive material with a single electrically conductive metal material different from that of the conductive material; and polishing the metal material effective to form an electrically conductive plug within the opening comprising the conductive material and the metal material, the electrically conductive plug having an outermost surface second roughness after said metal material-polishing which is less than that of the first roughness; the method alleviating roughness defects in the electrically conductive plug.