Patent ID: 8916923
Filing Date: 2014-12-23
Classification: B82Y,H01L

Abstract:
1. A nonvolatile semiconductor memory, comprising: a first tunnel insulating film on a channel region of a semiconductor portion; a first nanoparticle layer on the first tunnel insulating film, comprising a first conductive nanoparticle satisfying a Coulomb blockade condition; a second tunnel insulating film on the first nanoparticle layer; a second nanoparticle layer on the second tunnel insulating film, comprising a second conductive nanoparticle satisfying the Coulomb blockade condition; a third tunnel insulating film on the second nanoparticle layer; a charge storage layer on the third tunnel insulating film; an insulating film on the charge storage layer; and a gate electrode on the insulating film, wherein the charge storage layer has an energy level of electron which is lower than an energy level of electron of the first and second nanoparticle layers when no voltage is applied between the gate electrode and the channel region, an average particle size (d) of a plurality of the second conductive nanoparticle is smaller than an average particle size (d an average energy value ΔE a difference between ΔE