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

Claim 9:
10. A semiconductor device structure comprising:
a channel region over a substrate;
a source or drain (S/D) trench over the substrate, wherein the S/D trench comprises a bottom trench region extending below a major surface of the substrate;
a liner within the bottom trench region;
wherein the liner comprises a first liner element on a bottom surface of the bottom trench region;
wherein the liner further comprises a second liner element on sidewalls of the bottom trench region;
an under-contact spacer on the first liner and along first portions of the second liner element such that second portions of the second liner element extend above the under-contact spacer;
a S/D region within the S/D trench and adjacent to the channel region, wherein the S/D region comprises a top surface, sidewalls, and a bottom surface, wherein the S/D region does not extend below the 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; and
a wrap-around S/D contact configured such that a portion of the wrap-around S/D contact is beneath the bottom surface of the S/D region.