Patent ID: 6429126
Filing Date: 2002-08-06
Classification: C23C,H01L

Abstract:
A chemical vapor deposition method for depositing a tungsten film on a substrate disposed in a substrate processing chamber, said method comprising:flowing a first process gas comprising tungsten hexafluoride, a silane gas, molecular hydrogen and argon into said substrate processing chamber to deposit a first layer of tungsten, wherein a flow ratio of molecular hydrogen to argon is at least 1.5:1, a flow ratio of combined molecular hydrogen and argon to tungsten hexafluoride in said first process gas is at least 100:1, and a partial pressure of said tungsten hexafluoride is less tan or equal to 0.5 Torr; and flowing a second process gas comprising tungsten hexafluoride and a reduction agent into said substrate processing chamber to deposit a second layer of tungsten on said first layer.