Patent ID: 7772053

Claim:
A method for fabrication of a semiconductor device, comprising the steps of: (a) forming a source-drain material film on an insulator layer; (b) forming an opening portion reaching the insulator layer in the source-drain material film; (c) forming a semiconductor film on the insulator layer in the opening portion and on the source-drain material film in the opening portion; (d) forming a gate insulator on the semiconductor film; (e) forming a gate material film embedding the opening portion on the gate insulator; (f) forming a cap film on the gate material film, thereby forming a gate made of the gate material film; (g) after the step (f), forming a mask layer on the source-drain material film; and (h) removing the source-drain material film not protected by the mask layer while protecting the gate by the cap film, thereby leaving the source-drain material film on both sides of the gate.