Patent ID: 6165854
Filing Date: 2000-12-26
Classification: H01L

Abstract:
A method for forming a trench isolation region in a semiconductor substrate, said method comprising:opening a trench region in said semiconductor substrate;forming a first dielectric liner on the surface of said semiconductor substrate and the sidewalls and bottom surface of said trench regions;forming a second dielectric liner on said first dielectric liner;depositing a trench-filling layer on said second dielectric liner, thereby filling said trench region;removing portions of said trench-filling layer, said second dielectric liner and said first dielectric liner which exceed said trench regions;performing a substrate-surface oxidation to form a sacrificial oxide layer on the surface of said semiconductor substrate; andremoving said sacrificial oxide layer using an etching process with higher etching selectivity to said sacrificial oxide layer over said second dielectric liner, thereby said second dielectric liner protruding over the surface of said semiconductor substrate.