Patent ID: 6171889
Filing Date: 2001-01-09
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device formed on a SOI substrate in which a buried oxide film and a SOI layer are stacked on a silicon substrate, said method comprising the steps of:(a) preparing said SOI substrate;(b) defining a device forming region for forming said semiconductor device by electrically isolating a predetermined region of said SOI layer from other regions;(c) forming a first semiconductor region of a first conductivity type by ion-implanting an impurity of a first conductivity type and nitrogen into said device forming region;(d) giving heat treatment to said first semiconductor region in such a condition that said nitrogen gets a predetermined concentration distribution in a depth direction of said first semiconductor region;(e) forming a gate oxide film on said first semiconductor region;(f) forming a gate electrode on said gate oxide film; and(g) forming second semiconductor regions of a second conductivity type by ion-implanting an impurity of a second conductivity type and nitrogen into said first semiconductor region with said gate electrode as a mask,wherein said predetermined concentration distribution has:a first peak portion protruding with a first concentration, in the vicinity of an interface between said first semiconductor region and said buried oxide film; anda second peak portion protruding with a second concentration, in the vicinity of an interface between said first semiconductor region and said gate oxide film.