Patent ID: 7589017
Filing Date: 2009-09-15
Classification: C23C,H01L

Abstract:
1. A method of forming a tungsten film on a substrate in a reaction chamber, the method comprising: (a) positioning the substrate in a reaction chamber; (b) exposing the substrate to a non-boron-containing reducing agent; (c) exposing the substrate to a tungsten-containing precursor to form a portion of a tungsten nucleation layer; (d) exposing the substrate to a boron-containing species to form a boron-containing layer on the substrate; (e) contacting the boron-containing layer with a tungsten-containing precursor to form a portion of the tungsten nucleation layer; and (f) depositing a bulk tungsten layer over the tungsten nucleation layer to form the tungsten film; wherein the substrate temperature is maintained at about 450° C. or less during steps (b)-(e).