Patent ID: 6358802
Filing Date: 2002-03-19
Classification: H01L

Abstract:
A method for manufacturing a semiconductor device, comprising the steps of:preparing a semiconductor substrate having an element region defined by an isolation region; forming a nitrogen-containing gate oxide film and a conductive film successively on said element region and subjecting said films to an etching selectively to form a gate electrode; forming a first dielectric film containing nitrogen to cover entirely said gate electrode and effecting an anisotropic etching to leave said first dielectric film only at a side wall of said gate electrode; implanting impurity into said semiconductor substrate to form source and drain regions; forming a second dielectric film containing nitrogen so as to cover at least said gate electrode, said first dielectric film and said source and drain regions; implanting nitrogen ions into said second dielectric film; and forming a silicon nitride film so as to cover said second dielectric film and said underlying first dielectric film and said source and drain regions to prevent outward diffusion of nitrogen from said gate electrode during subsequent thermal annealing steps.