Patent ID: 6797587
Filing Date: 2004-09-28
Classification: H01L

Abstract:
A method for forming an isolation region comprising:providing a semiconductor substrate; forming over the semiconductor substrate an isolation trench mask layer which defines the location of an isolation trench to be formed adjoining an active region of the semiconductor substrate; etching the semiconductor substrate, while employing the isolation trench mask layer as an etch mask layer, to form the isolation trench adjoining the active region of the semiconductor substrate; laterally etching the isolation trench mask layer to form a laterally etched isolation trench mask layer which uncovers a corner of the active region of the semiconductor substrate adjoining the isolation trench; implanting into the corner of the active region, while employing the laterally etched isolation trench mask layer as an ion implantation mask layer, a dose of a dopant such as to provide a corner implanted active region; and forming into the isolation trench adjacent the corner implanted active region an isolation region.