Patent ID: 8748971
Filing Date: 2014-06-10
Classification: H01L

Abstract:
1. A nonvolatile semiconductor memory device comprising: a semiconductor substrate; a stacked body provided on the semiconductor substrate, the stacked body having electrode films and insulating films being alternately stacked; a first semiconductor pillar and a second semiconductor pillar provided inside a first through hole penetrating through the stacked body in a stacking direction of the stacked body, the first through hole having a first cross section of a first oblate circle, the first cross section being cut in a direction perpendicular to the stacking direction, the first semiconductor pillar facing the second semiconductor pillar in a first major axis direction of the first oblate circle, the first semiconductor pillar and the second semiconductor pillar extending in the stacking direction, the first semiconductor pillar having a first end provided on a side of the semiconductor substrate, the second semiconductor pillar having a second end provided on the side of the semiconductor substrate; a first charge storage layer provided between the electrode films and the first semiconductor pillar; a second charge storage layer provided between the electrode films and the second semiconductor pillar; a connection portion connecting the first end with the second end, the connection portion including a material same as a material included in the first semiconductor pillar and the second semiconductor pillar, the connection portion being not electrically connected to the semiconductor substrate; and a first hole-dividing-insulating-layer provided between the first semiconductor pillar and the second semiconductor pillar.