Patent ID: 6589881
Filing Date: 2003-07-08
Classification: H01L

Abstract:
A method of forming a dual damascene structure, comprising:providing a substrate having a conductive line therein; sequentially forming a passivation layer, a first dielectric layer, an etching stop layer, a second dielectric layer and a cap layer over the substrate, wherein the cap layer serves also as a base anti-reflection layer; patterning the cap layer and the second dielectric layer to form a first opening exposing a portion of the etching stop layer; forming a patterned negative photoresist layer over the cap layer, wherein the patterned negative photoresist layer has a second opening therein, and the second opening exposes a portion of the cap layer and the first opening; simultaneously removing the exposed portion of the cap layer within the second opening to expose a portion of the second dielectric layer and removing the exposed portion of the etching stop layer within the first opening to expose a portion of the first dielectric layer; simultaneously removing the exposed portion of the second dielectric layer within the second opening to form a trench and removing the exposed portion of the first dielectric layer within the first opening to form a via opening to expose a portion of the passivation layer; removing the exposed portion of the passivation layer within the via opening; removing the negative photoresist layer; forming a conformal barrier layer over the trench and the via opening; and forming a conductive layer over the barrier layer, wherein the conductive layer completely fills the trench and the via opening.