Patent ID: 6524928
Filing Date: 2003-02-25
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device, which is formed by an SOI (Silicon On Insulator) substrate on which a semiconductor layer is formed on a semiconductor substrate through an insulating film, and in which semiconductor elements are formed in said semiconductor layer of said SOI substrate, said method comprising the steps of:forming an impurity diffused region in the semiconductor layer around activation regions in which said semiconductor elements are formed; and introducing impurities into said impurity diffused region before the formation of gate oxide films in said semiconductor elements having an MOS structure, wherein after the formation of said semiconductor elements having said MOS structure, a surface concentration of said impurity diffused region is between 1Ã—1018 atom/cm3 and 5Ã—1020 atom/cm3, and wherein heavy metal impurities in the activation regions become concentrated in the impurity diffused region during a heat treatment to selectively form an insulating film in the surface of the semiconductor layer after forming the impurity diffusion region.