Nonvolatile memory device and electronic system including the same

Abstract

A nonvolatile memory device includes a substrate including a memory cell region and a connection region; a mold structure including a plurality of gate electrodes and a plurality of mold insulating layers alternately stacked; a channel structure passing through the mold structure in the memory cell region; a first cell contact passing through the mold structure in the connection region, connected to a first gate electrode and electrically disconnected from a second gate electrode; a plurality of support structures surrounding the first cell contact planarly in the connection region and extending through the mold structure; and a dam structure located between the first cell contact and the second gate electrode in the connection region and apart from the first cell contact with an insulating ring therebetween.