Patent ID: 6812134
Filing Date: 2004-11-02
Classification: H01L

Abstract:
A process for forming a barrier film to prevent poisoning a photoresist material used in forming a semiconductor device, comprising:depositing a first barrier layer containing silicon carbide and nitrogen directly on a layer having an interconnect conductor; depositing a nitrogen-free second barrier layer directly on top of the first barrier layer, wherein the second barrier layer comprises nitrogen-free silicon carbide; forming a first low-k dielectric layer over the second barrier layer; depositing a photoresist material to form a photoresist layer above at least a portion of the first low-k dielectric layer; prior to depositing said photoresist material, forming an etch stop layer on top of the second barrier layer and forming a second low-k dielectric layer on top of the etch stop layer; patterning the photoresist layer to form a photoresist mask over the second low-k dielectric layer where a trench is to be formed; forming the trench in the second low-k dielectric layer by etching using the photoresist mask; forming and patterning a second photoresist layer to form a second photoresist mask over the second dielectric layer and the trench; and forming a via in the first dielectric layer by etching to complete a dual damascene structure.