Patent ID: 8790751

Claim:
A method of promoting adhesion in a wafer comprising: placing a wafer in a chamber, the wafer comprising: a first copper line; a first silicon nitride layer disposed over the first copper line; a dielectric layer disposed over the silicon nitride layer; a tantalum liner disposed in an opening in the dielectric layer and the silicon nitride layer; a second copper line disposed in a volume bounded by the tantalum liner; and a second silicon nitride layer disposed over the second copper line and the dielectric layer; and providing SiH 4 in the chamber, wherein, copper atoms from the second copper line are diffused into the second silicon nitride layer to increase an interface between the second copper line and the second silicon nitride layer, further wherein, the diffused copper atoms from the second copper line eliminate silicon diffusion from the second silicon nitride layer into the second copper line.