Patent ID: 11910605
Assignee: KIOXIA CORPORATION
Field: Computer technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 16:
17. A method of manufacturing a semiconductor storage device, the method comprising:
forming a first stack by stacking at least one sacrificial layer and at least one insulating layer in a first direction;
forming a first insulator penetrating the first stack and extending in a second direction intersecting the first direction;
forming a second stack by alternately stacking a plurality of sacrificial layers and a plurality of insulating layers one by one on the first stack and the first insulator;
forming a plurality of first columns, each including a semiconductor layer and penetrating the second stack;
forming a first slit and a second slit penetrating the second stack and extending in the second direction;
forming a third slit penetrating the second stack and extending in the second direction between the first and second slits in a third direction intersecting the first and second directions, such that the third slit has two portions separated from each other in the second direction;
removing the sacrificial layers of the first and second stacks and forming a plurality of conductive layers in spaces left by removal of the sacrificial layers;
filling the first, second, and third slits with an insulating material to form second, third, and fourth insulators, respectively; and
forming a fifth insulator penetrating an uppermost one of the conductive layers above the first insulator, such that the fifth insulator extends between two portions of the fourth insulator formed in the two portions of the third slit in the second direction.