Patent ID: 6291333
Filing Date: 2001-09-18
Classification: H01L

Abstract:
A fabrication method for a dual damascene, comprising:forming a first dielectric layer, a stop layer, a second dielectric layer, and a cap layer in sequence on a substrate, wherein the cap layer and the second dielectric layer having a trench therein for exposing a part of the stop layer, and the stop layer and the first dielectric layer having a via opening therein for exposing a part of the substrate;removing a part of the stop layer for forming a cavity between the first dielectric layer and the second dielectric layer;forming a first spacer on a sidewall of the cap layer and the second dielectric layer for filling the cavity and a second spacer on a sidewall of the first dielectric layer; andforming a metal layer for covering a profile of the trench and a profile of the via opening.