Patent ID: 9035372
Filing Date: 2015-05-19
Classification: H01L

Abstract:
1. A nonvolatile memory device comprising: a semiconductor substrate; a first NAND string extending in a first direction and comprising a plurality of memory cells, wherein the first NAND string further comprises (i) a stacked structure in which one or more interlayer insulating layers and one or more conductive gate layers are repeatedly and alternately formed over the semiconductor substrate, (ii) a gate insulating layer and a composite insulating layer formed over a sidewall of the stacked structure, and (iii) a channel layer extending in the first direction which is perpendicular to an upper surface of the semiconductor substrate; a second NAND string formed over the first NAND string and extending in the first direction; an erasing bulk layer located between the first NAND string and the second NAND string and including a conductive semiconductor material; and a protrusion extending from the channel layer in a second direction different from the first direction, the protrusion coupled to the erasing bulk layer and having a doping concentration different from that of the erasing bulk layer.