Patent ID: 6143641
Filing Date: 2000-11-07
Classification: H01L

Abstract:
A method of forming a copper-based interconnect structure, the method comprising:forming a layer of intermetal dielectric material on an underlying layer of conductive material;forming a pattern of vias through the intermetal dielectric later to expose surface regions of the conductive material;forming an adhesion layer on exposed sidewalls of the vias and on an upper surface of the intermetal dielectric materials;filling the adhesion-layer-lined vias with a conductive material that includes copper;performing a planarizing step to planarize the copper-including conductive material and the upper surface of the intermetal dielectric material;removing the intermetal dielectric material to expose the adhesion-layer-lined copper-including conductive material;depositing a diffusion barrier material on exposed surfaces of the adhesion-layer-lined copper-including conductive material while allowing exposed surfaces of the underlying conductive material to remain exposed;depositing a layer of low k dielectric material on the exposed surfaces of the underlying conductive material and to cover the copper-including conductive material; andforming passivation material on the layer of low k dielectric material.