Patent ID: 6040232
Filing Date: 2000-03-21
Classification: H01L

Abstract:
A method of manufacturing a shallow trench isolation suitable for a substrate having a pad oxide layer and a mask layer in sequence, a trench penetrating through the mask layer and the pad oxide layer and into the substrate defining a sidewall of the mask layer, a sidewall of the pad oxide layer and exposed surface of the substrate, and a first liner oxide layer covering the sidewall of the pad oxide layer and the exposed surface of the substrate, the method comprising the steps of:stripping away a portion of the first liner oxide layer to expose a bottom corner of the sidewall of the mask layer;stripping away a portion of the mask layer from its sidewall and bottom corner to expose a top corner of the first oxide layer adjacent and connected to the sidewall of the pad oxide layer;removing the first liner oxide layer;forming a second liner oxide layer on the sidewall and the base surface of the trench; andfilling the trench with an insulating material to form a shallow trench isolation.