Patent ID: 11887936
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 18:
19. An electronic system comprising:
a main substrate;
a semiconductor device on the main substrate; and
a controller electrically connected to the semiconductor device on the main substrate,
wherein the semiconductor device comprises
a substrate comprising a first area, and a second area spaced apart from the first area,
a first stack structure comprising a plurality of first insulating layers and a plurality of first wiring layers repeatedly and alternately stacked in the first area on a substrate,
a second stack structure comprising a plurality of second insulating layers and a plurality of second wiring layers repeatedly and alternately stacked on the first stack structure,
a first channel hole extending through the first stack structure,
a second channel hole extending through the second stack structure and communicating with the first channel hole,
a channel structure in the first channel hole and the second channel hole,
a bit line on the channel structure,
a first auxiliary stack structure comprising the plurality of first insulating layers and a plurality of first mold layers repeatedly and alternately stacked in the second area on the substrate,
an alignment key extending into the first auxiliary stack structure and protruding to a higher level than an uppermost end of the first stack structure, and
a second auxiliary stack structure disposed on the first auxiliary stack structure and the alignment key, the second auxiliary stack structure comprising the plurality of second insulating layers and a plurality of second mold layers repeatedly and alternately stacked,

wherein the second auxiliary stack structure comprises a protrusion aligned with the alignment key, and
wherein an uppermost end of the protrusion protrudes to a higher level than an uppermost end of the second stack structure.