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This paper proposes a simplified fabrication processing for nanosheet Field-Effect Transistors (FETs) part of beyond-3-nm node technology. Formation of the ground plane (GP) region can be replaced by an epitaxial grown doped ultra-thin (DUT) layer on the starting wafer prior to Six/SiGe1−x stack formation. The proposed process flow can be performed in-situ, and does not require changing chambers or a high temperature annealing process. In short, conventional processes such as ion implantation and subsequent thermal annealing, which have been utilized for the GP region, can be replaced without degrading device performance.

N-Type Nanosheet FETs without Ground Plane Region for Process Simplification