Patent ID: 11864388
Assignee: YANGTZE MEMORY TECHNOLOGIES CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 19:
20. A semiconductor device, comprising:
gate layers and insulating layers that are parallel to each other and stacked alternatingly along a first direction and form a stack;
an array of channel structures being formed in an array region of the stack;
a first staircase formed at a first section in a connection region of the stack, the connection region and the array region arranged in a second direction perpendicular to the first direction;
a second staircase formed at a second section in the connection region of the stack; and
a dummy staircase formed at the first section and disposed between the first staircase and the second staircase, the dummy staircase including dummy group stair steps descending in the second direction, and dummy division stair steps descending in a third direction and a fourth direction that are perpendicular to the second direction and the first direction and opposite to each other,
wherein the dummy group stair steps of the dummy staircase face the first staircase, and the dummy staircase has a vertical sidewall that faces the second staircase and has a length in the first direction equal to a height of the dummy staircase in the first direction.