Patent ID: 6297152
Filing Date: 2001-10-02
Classification: C23C,H01L

Abstract:
A process for forming a layer on a substrate, said process comprising:(a) forming a polysilicon layer over said substrate;(b) thereafter, depositing a tungsten silicide layer on said polysilicon layer in a chemical vapor deposition process by:(i) during a first process stage, introducing a tungsten-containing gas into a substrate processing chamber in an amount less than 5 cubic centimeters without flowing a silicon-containing source into said chamber;(ii) during a second process stage after said first stage, flowing a silicon-containing gas into said chamber without flowing a tungsten-containing gas; and(iii) during a third process stage after said second stage, flowing a process gas comprising said tungsten-containing gas and dichlorosilane into the chamber to deposit said tungsten silicide layer, wherein an average bulk ratio of silicon to tungsten in said tungsten silicide layer is between 2.0 to 2.8.