Patent ID: 8237226

Claim:
A semiconductor device, comprising: a fin formed on and extending-vertically from a semiconductor substrate and having a strain in a vertical direction in a channel region therein, the fin being composed of Si; gate insulating films formed vertically on opposed sides of said fin; a gate electrode formed so as to sandwich the gate insulating films on both side faces of a portion of the fin including the channel region; and a film formed at least either directly on or directly under a portion of the fin including the channel region, the film configured to generate a strain to the portion of the fin, the film comprising a SiGe oxide film or a Ge oxide film for generating a compressive strain in the vertical direction in the channel region of the fin, or a Si oxide film for generating a tensile strain in the vertical direction in the channel region of the fin, wherein the film is formed only between the gate insulating films at least either at a position covering the whole upper surface of the fin or a position covering the whole lower surface of the fin.