Patent ID: 7510965
Filing Date: 2009-03-31
Classification: H01L

Abstract:
1. A method for fabricating a dual damascene structure, comprising: providing a substrate having a conductive layer, a first etching stop layer, a dielectric layer, and a first photoresist layer positioned on the surface of the substrate in order; patterning the first photoresist layer so as to defined a via pattern on the first photoresist layer; performing a first etching process to remove a portion of the dielectric layer through the via pattern, until the etching stop layer is exposed so as to form a via hole structure in the dielectric layer; performing a first ash process to remove the first photoresist layer by providing a gas comprising carbon monoxide (CO-containing gas); filling gap-fill polymer (GFP) materials into the via hole structure; forming a second photoresist layer on the substrate; patterning the second photoresist layer to define a trench pattern; performing a second etching process to etch the dielectric layer though the trench pattern so as to form a trench structure on the upper portion of the dielectric layer, the trench structure exposing the via hole structure; removing the second photoresist layer and the GFP materials in the via hole structure; and removing the first etching stop layer exposed by the via hole structure.