Patent ID: 11956963
Assignee: SK HYNIX INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method of fabricating a 3-dimensional NAND flash memory device, the method comprising:
providing a substrate;
alternately and repeatedly stacking an insulating film and a first conductive film on the substrate;
forming first holes spaced apart from each other in a first direction and in a second direction crossing the first direction, the first and second directions being parallel to a top surface of the substrate, the first holes penetrating through the insulating film and the first conductive film which are repeatedly stacked, in a vertical direction perpendicular to the first and second directions;
forming a first fixed charge region on a sidewall of the insulating film exposed through the first holes;
forming an information storage film on inner sidewalls of holes penetrating through the insulating film including the first fixed charge region and the first conductive film; and
forming a semiconductor channel layer on an exposed sidewall of the information storage film,
wherein the alternately and repeatedly stacking the insulating film and the first conductive film further includes stacking a second conductive film having a work function smaller than that of the first conductive film between the insulating film and the first conductive film in the vertical direction, thereby forming a stack including a plurality of insulating films, a plurality of first conductive films, and a plurality of second conductive films, and
wherein the second conductive film is disposed to contact each of top and bottom surfaces of each of the plurality of first conductive films.