Patent ID: 6117748
Filing Date: 2000-09-12
Classification: H01L

Abstract:
A method of forming a shallow trench isolation on a substrate, said method comprising:forming a pad oxide layer on said substrate;subsequent to the formation of said pad oxide layer, forming a dielectric layer on said pad oxide layer;subsequent to the formation of said dielectric layer, forming an in situ doped polysilicon layer on said dielectric layer;forming at least one trench in said substrate;forming an oxide liner along walls of said at least one trench and on a surface of said in situ doped polysilicon layer;forming a CVD oxide layer for isolation atop said oxide liner and within said at least one trench;performing an oxide slurry CMP on said CVD oxide; said oxide slurry CMP stopping before reaching surface of said in situ doped polysilicon layer; andperforming a poly slurry CMP on the remaining CVD oxide and said in situ doped polysilicon layer, said poly slurry CMP stopping at a surface of said dielectric layer.