Patent ID: 7833893
Filing Date: 2010-11-16
Classification: H01L

Abstract:
1. A method of forming a conductive wire, comprising: (a) forming a dielectric layer on a substrate; (b) forming a dielectric hardmask layer on a top surface of said dielectric layer; (c) forming an electrically conductive hardmask layer on a top surface of said dielectric hardmask layer; (d) forming a trench extending from a top surface of said electrically conductive hardmask layer, through said electrically conductive hardmask layer, through said dielectric hardmask layer and into said dielectric layer, said trench having sidewalls and a bottom; after (d), (e) depositing a continuous electrically conductive liner/seed layer on said top surface of said electrically conductive hardmask layer and said sidewalls and bottom of said trench; after (e), (f) forming a layer of an organic fill material on the entire top surface of said electrically conductive liner/seed layer, said fill material completely filling said trench; after (f), (g) removing said layer of organic fill material from said top surface of said electrically conductive hardmask layer and recessing said organic material below said top surface of said electrically conductive hardmask layer using a reactive ion etch process selective to said electrically conductive liner/seed layer so a top surface of said organic fill material is between the top surface of said electrically conductive liner/seed layer and above said top surface of said dielectric hardmask layer; after (g), (h) removing said electrically conductive liner/seed layer from said top surface of said electrically conductive hardmask layer; after (h), (i) removing all remaining fill material from said trench, said electrically conductive liner/seed layer remaining on the entire surface of said sidewalls and said bottom of said trench; after (i), (j) electroplating a metal layer onto exposed surface of said electrically conductive hardmask layer and said electrically conductive liner/seed layer, said metal layer filling said trench; and after (j), (k) performing a chemical-mechanical-polish to remove said metal layer from said electrically conductive hardmask layer and to remove said electrically conductive hardmask layer from said dielectric hardmask layer, after said chemical mechanical polish, top surfaces of said metal layer, an edge of said electrically conductive liner/seed layer and said top surface of said dielectric hardmask layer are coplanar.