Patent ID: 7141849

Claim:
A semiconductor storage device comprising: a first conductivity type semiconductor part composed of any one of a semiconductor substrate a well region provided in a semiconductor substrate and a semiconductor film disposed on an insulator; a gate insulating film formed on the first conductivity type semiconductor part; a gate electrode formed on the gate insulating film; charge holding portions formed on opposite sides of the gate electrode; second conductivity type diffusion layer regions formed in regions of the first conductivity type semiconductor part corresponding to the respective charge holding portions; and a channel region below the gate electrode; wherein the charge holding portions are each constructed so as to change, in accordance with an electric charge amount held in the charge holding portions, a current amount flowing from one of the second conductivity type diffusion layer regions to the other of the diffusion layer regions through the channel region when a voltage is applied to the gate electrode; and part of each charge holding portion is present below an interface of the gate insulating film and the channel region.