Patent ID: 11910600
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 12:
13. A three-dimensional nonvolatile memory device, comprising:
a substrate including a cell area in which cells are arranged and an extension area arranged at a side of the cell area in a first direction, wherein the extension area has a staircase structure in the first direction;
a vertical structure extending in a vertical direction from an upper surface of the substrate;
a stacking structure having electrode layers and interlayer insulating layers alternately stacked on the substrate along a side wall of the vertical structure; and
a separation insulating layer extending on the substrate in the first direction and separating the electrode layers in a second direction that intersects the first direction,
wherein the cell area comprises a main cell area in which normal cells are arranged and an edge cell area at a peripheral part of the cell area,
the separation insulating layer comprises a main separation insulating layer in the main cell area and edge separation insulating layers in the edge cell area, and
at least two edge separation insulating layers of the edge separation insulating layers have different depths.