Patent ID: 7618889

Claim:
A method of forming a dual damascene structure on the surface of a substrate, comprising: depositing a dielectric film stack comprising a bottom barrier layer and a bulk dielectric insulating layer on the surface of the substrate; applying a first resist material layer over the dielectric film stack; performing trench lithography on the first resist material layer to form a trench pattern thereon; etching a portion of the dielectric film stack to define one or more trenches therein according to the trench pattern on the first resist material layer; removing the first resist material layer from the surface of the substrate; filling the one or more trenches with an organic material; depositing a mask layer over the organic material filling the one or more trenches; applying a second resist material layer over the mask layer; performing via lithography on the second resist material layer to form a via pattern thereon; etching the mask layer to define one or more vias within the organic material filled trenches according to the via pattern on the second resist material layer; etching the organic material to form the one or more vias therein according to the via pattern; etching the bulk dielectric insulating layer to form the one or more vias therein according to the via pattern; etching the bottom barrier layer to form the one or more vias therein according to the via pattern; removing the organic material from the organic material filled trenches and the one or more vias; and forming the one or more trenches and one or more vias therein the dielectric film stack on the surface of the substrate.