DUAL DAMASCENE PROCESS UTILIZING A LOW-K DUAL DIELECTRIC

摘要

A method of fabricating an integrated circuit with a dual dielectric structure and utilizes a dual damascene process to fabricate metal interconnection layers. The dual dielectric structure consists of a first insulating layer (24) of conventional dielectric material, and a second insulating layer (26) of a second dielectric material with a low dielectric constant (low-k dielectric material). The first dielectric material is used in regions of the integrated circuit where the superior mechanical properties of conventional dielectric materials will result in maintaining the reliability and mechanical properties of the integrated circuit. The second dielectric material is used in regions of the integrated circuit where the low dielectric constant will result in improved speed of the integrated circuit and reduced electrical coupling between conductors in the integrated circuit. The fabrication of the dual dielectric structure is integrated with a dual damascene metallization process.