Patent ID: 8335111

Claim:
A non-volatile semiconductor storage device comprising: a memory string including a plurality of memory transistors connected in series; a select transistor having one end connected to one end of the memory string; a carrier selection element having one end connected to the other end of the select transistor, the carrier selection element operative to select a majority carrier flowing through respective bodies of the memory transistors and the select transistor; and a control circuit configured to control respective states of the memory string, the select transistor, and the carrier selection element, the select transistor comprising: a second semiconductor layer extending in a vertical direction to a substrate and functioning as a body of the select transistor; a first gate insulation layer formed to surround the second semiconductor layer; and a second conductive layer formed to surround the second semiconductor layer via the first gate insulation layer and to extend in a parallel direction to the substrate, the second conductive layer functioning as a gate of the select transistor, the carrier selection element comprising: a third semiconductor layer extending in the vertical direction to the substrate and functioning as a body of the carrier selection element; a metal layer extending in the vertical direction to the substrate from a top surface of the third semiconductor layer; a second gate insulation layer formed to surround the third semiconductor layer and the metal layer; and a third conductive layer formed to surround the third semiconductor layer and the metal layer via the second gate insulation layer and to extend in a parallel direction to the substrate, the third conductive layer functioning as a gate of the carrier selection element.