Patent ID: 7115494

Claim:
A method for forming a tungsten layer on a substrate surface, comprising: (a) positioning a substrate within a deposition chamber; (b) heating the substrate to a temperature within a range from about 200° C. to about 400° C. and pressurizing the deposition chamber to a pressure of at least about 1 Torr; (c) flowing a reducing gas into the deposition chamber, whereby the reducing gas is adsorbed onto a substrate surface of the substrate to form an adsorbed reducing gas layer; (d) purging the reducing gas from the deposition chamber; (e) flowing a tungsten-containing gas into the deposition chamber, whereby the tungsten-containing gas is exposed to the adsorbed reducing gas layer and is substantially reduced to form a tungsten film on the substrate surface; (f) purging the tungsten-containing gas from the deposition chamber; and (g) repeating (c) through (f) for one or more additional cycles to form a tungsten nucleation layer thereon.