Patent ID: 6087262
Filing Date: 2000-07-11
Classification: H01L

Abstract:
A method for manufacturing shallow trench isolation structure, comprising the steps of:providing a substrate having a shallow trench and an active region thereon;forming a silicon nitride layer over the active region of the substrate;forming an insulation layer that fills the shallow trench and covers the silicon nitride layer;forming a conformal mask layer over the insulation layer;forming an oxide layer on the conformal mask layer;polishing a portion of the oxide layer until the mask layer is exposed, wherein the mask layer serves as a polishing stop layer;removing the mask layer in the active region to expose the insulation layer;removing the oxide layer above the shallow trench and the insulation layer above the active region, thereby exposing the mask layer above the shallow trench;removing the mask layer above the shallow trench; andremoving the insulation layer to expose the silicon nitride layer.