Patent ID: 7429516

Claim:
A The method for forming a tungsten barrier material on a substrate, comprising: exposing a substrate to a tungsten precursor to form a tungsten layer thereon, wherein the tungsten precursor is selected from the group consisting of tungsten hexafluoride, tungsten carbonyl, and derivatives thereof; repeatedly exposing the substrate seguentially to the tungsten precursor and a nitrogen precursor to form a tungsten nitride layer on the tungsten layer, wherein the nitrogen precursor is selected from the group consisting of nitrogen gas, ammonia, hydrazine, monomethyl hydrazine, dimethyl hydrazine, t-butyl hydrazine, phenyl hydrazine, 2,2′-azotertbutane, ethylazide, derivatives thereof, and combinations thereof; and depositing a tungsten bulk layer over the tungsten nitride layer by a chemical vapor deposition process.