Patent ID: 6099904
Filing Date: 2000-08-08
Classification: C23C,H01L

Abstract:
A chemical vapor deposition process for depositing a tungsten film on a substrate, said method comprising:(a) placing a substrate in a deposition zone;(b) during a first deposition stage, depositing a first layer of said tungsten film by:(i) flowing a process gas comprising a tungsten-containing source, a group III or V hydride and an additional reduction agent into said deposition zone, and(ii) maintaining said deposition zone at or below a first pressure while maintaining other process variables at conditions suitable to deposit said first layer of the tungsten film;(c) during a second deposition stage after said first stage, depositing a second layer of the tungsten film on said first layer by:(i) stopping the flow of said group III or V hydride into said deposition zone, and thereafter(ii) increasing the pressure in said deposition zone to a second pressure above said first pressure while maintaining other process variables at conditions suitable to deposit said second layer of the tungsten film.