Patent ID: 6251750
Filing Date: 2001-06-26
Classification: H01L

Abstract:
A method of manufacturing a shallow trench isolation, comprising the steps of:providing a substrate;forming a pad oxide layer on the substrate;forming a mask layer on the pad oxide layer;patterning the mask layer, the pad oxide layer and the substrate to form a trench;performing a thermal oxidation process to form a liner oxide layer on a portion of the substrate exposed by the trench;forming a spacer on a sidewall of the mask layer, the pad oxide layer and the trench;performing an oxidation process to oxidize a portion of the substrate under a portion of the liner oxide layer located on a bottom of the trench;forming an insulating layer over the substrate and filling the trench;performing a planarization process to remove a portion of the insulating layer until the mask layer is exposed; andremoving the mask layer and the pad oxide layer.