Patent ID: 6927459

Claim:
A semiconductor device comprising: a silicon semiconductor substrate; a groove section formed to a specific depth from a surface of the semiconductor substrate so as to separate the silicon semiconductor substrate into a plurality of regions; an element isolation region which is formed by burying at least a first and second insulating films differing in silicon epitaxial growth rate sequentially in the groove section and which defines element forming regions on said silicon semiconductor substrate, the first insulating film including a portion exposed along a boundary region defined between a surface of the element insolation region and a surface of the element forming region, and the second insulating film is exposed inside the first insulating film in the element insolation region; a gate electrode selectively formed on a first region of the element forming region of the silicon semiconductor substrate defined by said element isolation region via a gate insulation film; a source region and a drain region formed in a second region of the element forming region of the surface of said silicon semiconductor substrate, said first region being sandwiched between the source region and the drain region; and a silicide film formed so as to cover from said source region and drain region to the first insulating film in said element isolation region of said silicon semiconductor substrate, wherein said first insulating film is made of a material whose silicon epitaxial growth rate is higher than that of said second insulating film.