Patent ID: 11876136
Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 17:
18. A semiconductor device structure comprising:
a channel region formed over a substrate;
a source or drain (S/D) trench formed over the substrate, wherein the S/D trench comprises a bottom trench region configured to extend into the substrate;
a S/D region formed within the S/D trench and adjacent to the channel region;
wherein the S/D region does not extend below a major surface of the substrate and does not extend into the bottom trench region;
wherein the S/D region is communicatively coupled to the channel region;
a wrap-around S/D contact formed on a top surface, sidewalls, and a bottom surface of the S/D region; and
an under-contact spacer formed within the bottom trench region;
wherein the under-contact spacer is positioned between the wrap-around S/D contact and the substrate;
wherein the under-contact spacer comprises a first under-contact spacer layer and a second under-contact spacer layer;
wherein the first under-contact spacer layer comprises a liner at least partially positioned beneath a bottom surface of the second under-contact spacer layer; and
wherein the second under-contact spacer layer comprises an etched spacer.