Patent ID: 7550382

Claim:
A method for manufacturing a semiconductor device comprising: forming an island-shaped semiconductor film; forming a first insulating film over the island-shaped semiconductor film; forming a conductive film to cover the island-shaped semiconductor film and the first insulating film; etching the conductive film to form a plurality of electrodes separated by a distance “a” in a first direction, wherein the plurality of electrodes overlap the island-shaped semiconductor film with the first insulating film interposed between the plurality of electrodes and the island-shaped semiconductor film; forming an impurity region by adding an impurity element into the island-shaped semiconductor film by using the plurality of electrodes as masks; forming a second insulating film to cover the plurality of electrodes and the island-shaped semiconductor film; performing etching to the second insulating film to expose a portion of the island-shaped semiconductor film and to form a first insulator with a width “b” formed on each side face of each of the plurality of electrodes and a second insulator formed in a region between the electrodes; and forming a metal silicide layer in the exposed portion of the island-shaped semiconductor film, wherein the distance “a” between the electrodes and the width “b” of the first insulator satisfy a relation of a <2b.