Patent ID: 6908849

Claim:
A method of fabricating a contact structure on a silicon substrate, comprising: forming an insulating layer on an upper surface of the substrate; forming an opening in the insulating layer, wherein the opening extends from an upper surface of the insulating layer to the upper surface of the substrate; forming a titanium layer interspersed with titanium silicide in the opening wherein the titanium layer interspersed with titanium silicide directly contacts the upper surface of the substrate, wherein the titanium layer reacts with silicon in the substrate to form a titanium silicide layer, wherein the titanium silicide interspersed in the titanium layer reduces the consumption of silicon during the formation of the titanium silicide layer; forming a conductive contact fill in the opening, wherein the conductive contact fill comprises titanium nitride deposited directly on the titanium silicide layer, wherein the titanium nitride fills substantially the entire opening.