Patent ID: 9087715
Filing Date: 2015-07-21
Classification: G11C,H01L

Abstract:
1. A nonvolatile semiconductor memory device comprising: a semiconductor substrate; a structure comprising first and second memory cells stacked in a first direction perpendicular to the surface of the semiconductor substrate and which extends in a second direction parallel to the surface of the semiconductor substrate; and a beam, wherein the beam is connected to an end of the structure in the second direction and extends in a third direction perpendicular to the first and second directions, the structure and the beam each comprises first and second semiconductor layers stacked in the first direction, the first and second memory cells correspond to the first and second semiconductor layers in the structure, the beam comprises a contact portion in which the first and second semiconductor layers in the beam are in contact with plugs respectively at one end of the beam in the third direction, and a low resistance portion having a resistance value lower than that of the first and second semiconductor layers, the low resistance portion extends from the contact portion to the end of the structure, and the contact portion has a stepped shape that exposes the first and second semiconductor layers, and comprises the low resistance portion, in the first and second semiconductor layers exposed by the stepped shape.