Patent ID: 7777227

Claim:
A non-volatile semiconductor storage device comprising: a substrate; a first insulating layer formed on the substrate; a semiconductor layer formed of polysilicon on the first insulating layer; a pair of conductor regions formed on the first insulating layer to pass through the semiconductor layer and to sandwich a part of the semiconductor layer which includes a channel region, and formed of a metal or a silicide; a tunnel layer formed on the part of the semiconductor layer sandwiched between the pair of conductor regions; a charge storage layer formed on the tunnel layer; a second insulating layer formed on the charge storage layer; and a control gate formed on the second insulating layer, wherein an average particle diameter of silicon-grains forming the semiconductor layer below the charge storage layer is less than a length of the charge storage layer in a direction along which the pair of conductor regions face each other, and the channel region includes at least one grain boundary intercepting a current path of the channel region.