Patent ID: 6660650
Filing Date: 2003-12-09
Classification: H01L

Abstract:
A method of fabricating an electronic device over a semiconductor substrate having an interconnecting structure, said method comprising the steps of:forming a metallic electrically conductive structure; forming a dielectric having at least one layer over said electrically conductive structure, said dielectric having an upper surface; forming a hardmask on said upper surface of said dielectric having an upper surface and an opening therethrough extending to said upper surface, said opening formed by etching said hardmask with an etchant which does not substantially etch said dielectric; then forming an opening in said dielectric extending from said opening in said hardmask to expose a portion of said electrically conductive structure with an etchant which does not substantially etch said hardmask, said opening having sidewalls; selectively depositing an aluminum-containing electrically conductive material into said opening; and above and over said hardmask; and then performing an etchback process to remove any of the aluminum-containing conductive material formed on said hardmask and to etch back any portion of said aluminum-containing conductor which is situated over said upper surface of said dielectric.