Patent ID: 6037263
Filing Date: 2000-03-14
Classification: H01L

Abstract:
A method of forming a tungsten gate electrode for a self-aligned gate MOSFET on a silicon wafer comprising:(a) providing a silicon wafer;(b) forming a field oxide on said silicon wafer wherein said field oxide is patterned to define a silicon active area;(c) forming a gate oxide on said active area;(d) mounting said silicon wafer on a substrate support in a deposition chamber of a parallel plate plasma enhanced chemical vapor deposition reactor;(e) heating said silicon wafer;(f) flowing a first gas mixture containing H.sub.2, through said plasma enhanced chemical vapor deposition reactor;(g) striking an rf glow discharge in said plasma enhanced chemical vapor deposition reactor a time period thereby forming a plasma containing active hydrogen species;(h) after said time period, and while maintaining said glow discharge, flowing a second gas mixture containing hydrogen and WF.sub.6 into said deposition chamber whereby a tungsten layer is deposited on said silicon wafer; and(i) patterning said tungsten layer to form a gate electrode.