Patent ID: 9748105
Date: 2017-08-29
CPC Classifications: C23C,H01L

Claim:
1. A method for depositing a tungsten film on a substrate, comprising: positioning a substrate having a feature formed therein in a substrate processing chamber, wherein the feature is defined by at least one sidewall and a bottom surface; depositing a first tungsten film of a bulk tungsten layer by introducing a continuous flow of a hydrogen containing gas and a tungsten halide compound to the processing chamber to deposit the first tungsten film over the feature while maintaining the processing chamber at a first pressure and a first temperature of between about 300 degrees Celsius and about 430 degrees Celsius; etching the first tungsten film of the bulk tungsten layer in the processing chamber using a plasma treatment to remove a portion of the first tungsten film by exposing the first tungsten film to a continuous flow of the tungsten halide compound and an activated treatment gas while maintaining the processing chamber at a second pressure less than the first pressure and a second temperature of between about 300 degrees Celsius and about 430 degrees Celsius, wherein the activated treatment gas comprises activated helium gas, activated argon gas, activated oxygen gas, or activated nitrogen gas; and depositing a second tungsten film of the bulk tungsten layer by introducing a continuous flow of the hydrogen containing gas and the tungsten halide compound to the processing chamber to deposit the second tungsten film over the first tungsten film.