Patent ID: 11877452
Assignee: SANDISK TECHNOLOGIES, INC.
Field: nan (nan)
Classification: CPC H | IPC H

Claim 12:
13. The memory device of claim 1, wherein:
a first insulating material portion within the vertical stack of insulating material portions comprises a contoured inner sidewall having a top edge and a bottom edge;
the vertical cylindrical outer sidewall is a straight outer sidewall that extends straight from the top edge of the contoured inner sidewall to the bottom edge of the contoured outer sidewall; and
the straight outer sidewall of the first insulating material portion comprises:
a middle sidewall segment that vertically extends between a first horizontal plane including a top surface of a first one of the insulating layers to a second horizontal plane including a bottom surface of the first insulating layer;
an upper sidewall segment located above the first horizontal plane and in direct contact with a cylindrical inner sidewall of a first dielectric metal oxide portion that is located entirely outside of the cylindrical vertical plane including the vertical cylindrical outer sidewall of the first insulating material portion; and
a lower sidewall segment located below the second horizontal plane and in direct contact with a cylindrical inner sidewall of a second dielectric metal oxide portion that is located entirely outside of the cylindrical vertical plane including the vertical cylindrical outer sidewall of the first insulating material portion.