Patent ID: 6030882
Filing Date: 2000-02-29
Classification: H01L

Abstract:
A method for manufacturing a shallow isolation trench structure, comprising the steps of:providing a first conductive type substrate and then forming a mask layer over the substrate such that a trench pattern appears on the mask layer;implanting a second conductive type dopant into the substrate to form a doped region using the mask layer as a hard mask, wherein the first conductive type is different than the second conductive type;transferring the trench pattern in the mask layer onto the substrate for forming a trench such that a portion of the doped region in the substrate is removed, and only a portion of the doped region at an upper corner region of the trench is retained;forming a liner layer on an exposed surface of the trench by thermally oxidizing the exposed surface and the remaining portion of the doped region;depositing an insulation material to fill the trench; andremoving the mask layer to form a complete shallow trench isolation (STI) structure.