Patent ID: 7419859

Claim:
A method of manufacturing a semiconductor device comprising: forming a first trench having a first depth in a semiconductor substrate; forming a first insulation film in the first trench whereby an upper portion of the first insulation film extends above a plane defined by an upper surface of the semiconductor substrate; forming insulating spacers adjacent sidewalls on the upper portion of the first insulation film whereby the spacers extend across a first portion of the upper surface of the semiconductor substrate and exposing a second portion of the upper surface of the semiconductor substrate; removing a first thickness of the semiconductor substrate underlying the second portion of the upper surface of the semiconductor substrate to form second trench structures and thereby form a pair of fins adjacent opposite sidewalls of the first insulation film; filling the second trench structures with a third insulation film; removing an upper portion of the first insulation film while substantially maintaining the thickness of the third insulation film to form a residual first insulation film and to expose upper surface portions of the fins above the residual first insulation film; forming gate insulating layers on the upper surface portions of the fins; and forming a gate electrode on the residual first insulation film and the gate insulating layers.