Patent ID: 6048760
Filing Date: 2000-04-11
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device comprising the steps of:masking element areas of a silicon substrate of a first conductivity type with a masking layer;forming a field oxide film on field areas of the silicon substrate which are not protected by said masking layer to define separate element areas;introducing first impurities of said first conductivity type into said field oxide film;removing said masking layer and introducing second impurities of a second conductivity type opposite said first conductivity type into said field oxide film and into said element area to form an impurity diffusion layer;forming a refractory metal film over an area extending from said impurity diffusion layer to the field area; andheat treating to form a refractory metal silicide on the surface of said impurity diffusion layer;wherein said first impurities are present in the field oxide film in an amount sufficient to suppress a reaction between said refractory metal layer and said impurity-containing field oxide film in the heat treating step.