Patent ID: 11895838
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 4:
5. The vertical memory device as claimed in claim 1, further comprising:
gate electrode stack structures, each of which includes the first and second gate electrode structures; and
a first division pattern structure on the first substrate, the first division pattern structure extending in a second direction substantially parallel to the upper surface of the first substrate and separating the gate electrode stack structures from each other in a third direction, the third direction being substantially parallel to the upper surface of the first substrate and crossing the second direction,
wherein each of the first and second gate electrodes extends in the second direction, the first steps and the second steps being at respective ones of the end portions of the first gate electrodes and at respective ones of the end portions the of the second gate electrodes, respectively, in the second direction, and
wherein each of opposite sidewalls in the third direction of the first division pattern structure has concave and convex portions thereon.