Patent ID: 11862733
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  B | IPC H

Claim 18:
19. A method of manufacturing a semiconductor device, comprising:
forming a stacked structure by alternately stacking sacrificial layers and first to third channel layers, the first to third channel layers being stacked sequentially on a substrate;
removing a portion of the stacked structure extending in a first direction; forming active regions extending in the first direction by removing a portion of the substrate;
forming isolation layers between the active regions;
forming a sacrificial gate structure extending in a second direction to intersect the active region, on the substrate;
removing a portion of the stacked structure exposed by the sacrificial gate structure and defining a channel structure including the first to third channel layers;
forming spacer layers contacting sidewalls of the active regions;
forming a source/drain region on the active regions, on at least one side of the sacrificial gate structure; and
removing the sacrificial gate structure and forming a gate structure in a region in which the sacrificial gate structure is removed,
wherein the source/drain region has first protruding points at a first level, second protruding points at a second level, higher than the first level, and third protruding points at a third level, higher than the second level,
the source/drain region has a first width in the second direction between the first protruding points, a second width in the second direction between the second protruding points, and a third width in the second direction between the third protruding points,
the second width is smaller than the first width,
the third width is smaller than the first width and equal to or smaller than the second width, and
a protruding length of the first protruding points in the second direction is controlled by and is positively correlated with a contact length of the sidewalls of the substrate and the source/drain region.