Patent ID: 11869765
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 11:
12. A semiconductor device, comprising:
a substrate;
an isolation layer on the substrate;
an active region penetrating through the isolation layer and extending in a first direction;
a source/drain on a first portion of the active region;
an interlayer insulating layer on the isolation layer and the source/drain;
a contact hole penetrating through the interlayer insulating layer and exposing the source/drain; and
a contact structure in the contact hole and contacts the source/drain,
wherein the first direction is parallel to an upper surface of the substrate,
wherein the source/drain includes:
a base epitaxial region on the first portion of the active region;
a first epitaxial region on the base epitaxial region and having a recessed surface; and
a second epitaxial region on the recessed surface of the first epitaxial region,

wherein the second epitaxial region includes a lower portion and an upper portion on the lower portion,
wherein the lower portion of the second epitaxial region is at a lower level than the contact hole,
wherein the upper portion of the second epitaxial region extends in a lower region of the contact hole from the lower portion of the second epitaxial region, and contacts the contact structure,
wherein a maximum width in a second direction of the lower portion is greater than a maximum width in the second direction of the upper portion,
wherein the second direction is perpendicular to the first direction and is parallel to the upper surface of the substrate, and
wherein an upper end of the first epitaxial region is at a higher level than a lower end of the second epitaxial region.