Patent ID: 7001833
Filing Date: 2006-02-21
Classification: H01L,Y10S

Abstract:
1. A method for forming an opening in a carbon free low-k dielectric layer using DUV photolithography comprising: (a) providing a silicon wafer having a conductive wiring element over an insulative layer; (b) forming a low-k dielectric layer over said conductive wiring element; (c) depositing a carbon deficient silicon oxycarbide ARL over said low-k dielectric layer whereby carbon deficiency is accomplished by introducing hydrogen during said depositing thereby establishing a quantity of Si—H bonding in place of Si—C bonding in said ARL, wherein said carbon deficient silicon oxycarbide ARL contains less than about 10 atomic % carbon; (d) patterning a DUV photoresist layer over said ARL to define said opening; (e) etching said ARL in said opening thereby exposing said low-k dielectric layer; and (f) etching said exposed low-k dielectric layer, thereby exposing said conductive wiring element in said opening.