Patent ID: 11769797

Abstract:
A nanosheet semiconductor device and fabrication method are described for integrating the fabrication of nanosheet transistors (71) and capacitors/sensors (72) in a single nanosheet process flow by forming separate transistor and capacitor/sensor stacks (12A-16A, 12B-16B) which are selectively processed to form gate electrode structures (68A-C) which replace remnant SiGe sandwich layers in the transistor stack, to form silicon fixed electrodes using silicon nanosheets (13C, 15C) on a first side of the capacitor/sensor stack, and to form SiGe fixed electrodes using SiGe nanosheets (12C, 14C, 16C) from the middle of remnant SiGe sandwich layers in the capacitor/sensor stack (e.g., 16-2) which are separated from the silicon fixed electrodes by selectively removing top and bottom SiGe nanosheets (e.g., 16-1, 16-3) from the remnant SiGe sandwich layers in the capacitor/sensor stack.