Patent ID: 6635965
Filing Date: 2003-10-21
Classification: H01L

Abstract:
A method of forming a tungsten layer on a surface of a semiconductor substrate comprising the steps of:(a) positioning said semiconductor substrate at a deposition station within a deposition chamber; (b) heating said semiconductor substrate to a temperature between approximately 250 to 475Â° C. at said deposition station; (c) flowing a reducing gas into said deposition chamber whereby said reducing gas is adsorbed onto said surface of said substrate; (d) purging the reducing gas from the-deposition chamber; (e) flowing a tungsten-containing gas into said deposition chamber, whereby said deposited reducing gas is substantially reduced to a tungsten film; (f) purging the tungsten-containing gas from the deposition chamber; and (g) repeating (c) through (f) for one or more additional cycles, wherein the pressure of the deposition chamber is maintained at more than about 1 Torr.