Patent ID: 6265307
Filing Date: 2001-07-24
Classification: H01L

Abstract:
A dual damascene manufacturing method, which is applicable to a dual damascene structure, comprising the steps of:providing a substrate having a first dielectric layer, a thermal diffusion layer and a second dielectric layer formed in sequence thereon;forming a first mask layer on the second dielectric layer, the first mask layer having a trench line pattern to expose a first portion of the second dielectric layer;forming a second mask layer to cover the first mask layer and the exposed first portion of the second dielectric layer, the second mask layer having a via opening pattern therein to expose a second portion of the second dielectric layer;removing the second dielectric layer and the thermal diffusion layer using the second mask layer with the via opening pattern serving as a hard mask until a surface of the first dielectric layer is exposed to form a via opening in the second dielectric layer and the thermal diffusion layer;removing the second mask layer;removing the second dielectric layer uncovered by the first mask layer and the first dielectric layer uncovered by the thermal diffusion layer to form a trench line in the second dielectric layer and a via opening in the first dielectric layer, wherein the first mask layer and the thermal diffusion layer serve as a hard mask layer;forming a metal layer in the trench line and the via opening; andremoving the first mask layer.