Patent ID: 6432786
Filing Date: 2002-08-13
Classification: H01L

Abstract:
A method of forming a gate, oxide layer with an improved ability to resist process damage, comprising:(a) providing a silicon substrate on which an isolating area and an element area are defined; (b) growing a sacrificial oxide layer on the element area of the silicon substrate, and then doping nitrogen ions into the element area of the silicon substrate; (c) removing the sacrificial oxide layer; (d) growing an oxide layer on the silicon substrate in an oxygen atmosphere, wherein the nitrogen ions inside the silicon substrate enter the oxide layer to become a nitrogen-containing gate oxide layer; (e) depositing a polysilicon layer; (f) performing a gate doping process on the polysilicon layer; (g) performing a fluorine ion implantation on the polysilicon layer; and (h) performing a high-temperature tempering procedure.