Patent ID: 6271143
Filing Date: 2001-08-07
Classification: H01L

Abstract:
A method for forming a semiconductor device, the method comprising the steps of:providing a substrate;forming a masking layer over the substrate, the masking layer having an opening that exposes a portion of the substrate, the opening defining a sidewall of the masking layer;etching a trench region within the portion of the substrate that is exposed by the masking layer so that a sidewall of the trench region is substantially aligned with the sidewall of the masking layer;recessing the sidewall of the masking layer relative to the sidewall of the trench region to form a recessed region;filling the trench region and the recessed region with a trench fill material; andremoving a top portion of the trench fill material to form a trench isolation region, wherein trench fill material remains within the trench region and the recessed regions.