Patent ID: 11908952
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 0:
1. A semiconductor device, comprising:
a substrate;
a channel on the substrate;
a gate electrode extending on the channel; and
source/drain structures in recess regions on opposing sides of the gate electrode, the source/drain structures each comprising a first epitaxial layer and a second epitaxial layer on the first epitaxial layer,
wherein the second epitaxial layer is in a center region of each of the source/drain structures,
wherein the first epitaxial layer surrounds a bottom surface and both side surfaces of the second epitaxial layer,
wherein the side surfaces of the second epitaxial layer each comprise first portions that are inclined so that a width of the second epitaxial layer decreases toward the substrate,
wherein the second epitaxial layer fills more than half of each of the recess regions and comprises a recess portion in an upper surface thereof, and
wherein the second epitaxial layer has a first length in a first direction perpendicular to an upper surface of the substrate and has a second length, smaller than the first length, in a second direction perpendicular to the first direction.