Patent ID: 8586437

Claim:
A method of manufacturing a semiconductor device, the method comprising: providing a semiconductor substrate, the semiconductor substrate including: a first region where a FinFET (Fin Field Effect Transistor) is to be formed, and a second region where a PlanarFET (Planar Field Effect Transistor) is to be formed, wherein the first region includes: a plurality of fins formed on a substrate and parallel to each other, a first insulating film formed on the plurality of fins, a second insulating film formed on the first insulating film, and a first conducting film formed on the second insulating film, wherein the first insulating film, the second insulating film, and the first conducting film have a pattern of a first gate electrode of the FinFET, wherein the second region includes: the first insulating film formed on the substrate, the second insulating film formed on the first insulating film, and the first conducting film formed on the second insulating film, wherein the first insulating film, the second insulating film, and the first conducting film have a pattern of a second gate electrode of the PlanarFET, wherein a thickness of the first insulating film in the second region is greater than a thickness thereof in the first region; forming first extension regions in the plurality of fins in the first region by a plasma doping method using the first gate electrode as a mask; forming second extension regions in the second region by one of an ion implantation method and a plasma doping method using the second gate electrode as a mask; forming first side walls and second side walls on side surfaces of the first gate electrode and on side surfaces of the second gate electrode, respectively; and forming a source and a drain of the FinFET in the first region by an ion implantation method using the first gate electrode and first side walls as masks and forming a source and a drain of the PlanarFET in the second region by an ion implantation method using the second gate electrode and second side walls as masks, at the same time.