Patent ID: 7893483

Claim:
A neuron device comprising: a semiconductor layer provided above a substrate and being of a first conductivity type; source and drain regions formed in the semiconductor layer at a distance from each other, and being of a second conductivity type; a protection film formed on an upper face of the semiconductor layer; a channel region formed in the semiconductor layer between the source region and the drain region; a pair of gate insulating films formed on two side faces of the channel region; a floating gate electrode including: a first portion provided on the two side faces and an upper face of the channel region, with the gate insulating films and the protection film being interposed between the first portion and the channel region respectively; a second portion connected to the first portion, and provided on the substrate so as to extend from one of the two side faces of the channel region in a direction perpendicular to the one of the two side faces; and a third portion provided on the substrate so as to connect to the end portion of the second portion on the opposite side from the first portion, and having a greater width than the first portion and the second portion; an interelectrode insulating film provided on the first to third portions of the floating gate electrode; and a plurality of control gate electrodes provided on the third portion of the floating gate electrode, so that the interelectrode insulating film is interposed between the third portion and the control gate electrodes.