Patent ID: 7056774

Claim:
A method of manufacturing a semiconductor device, including an SOI layer secured to a Si substrate with a buried oxide film therebetween, forming a plurality of device separation regions in said SOI layer, and implanting an impurity into a Si active layer region between said device separation regions to form a body portion and source/drain portions so as thereby to constitute a MOSFET, said method comprising the steps of: forming a gate electrode over said body portion of said Si active layer region with a gate insulation film therebetween, implanting an impurity into said Si active layer region to form extension portions of said source/drain portions, and halo-implanting an impurity opposite in polarity from said impurity in said source/drain regions into said Si active layer region to form a reverse-characteristic layer, wherein the range of projection of said halo implantation is set to reach inside of said buried oxide film, wherein said Si active layer region is so formed that a depleted layer induced in said body portion reaches the interface between said SOI layer and said buried oxide film in said SOI substrate, wherein the gate insulation is SiO 2 and the gate electrode is a metal sillicide.