Patent ID: 7268071

Claim:
A method of fabricating a dual damascene interconnection, the method comprising: (a) forming on a substrate a dielectric layer that includes an organosilicon material; (b) forming a via photoresist pattern over the dielectric layer; (c) etching a via in the dielectric layer using the via photoresist pattern as an etch mask; (d) removing the via photoresist pattern; (e) forming a trench photoresist pattern over the dielectric layer; (f) etching a trench in the dielectric layer using the trench photoresist pattern as an etch mask, said trench being connected to the via; (g) removing the trench photoresist pattern; (h) implanting carbon ions into exposed surfaces of the via and the trench; (i) forming a barrier layer overlying the via and the trench; (j) completing interconnections by filling the trench and the via with copper.