Performance Evaluation of Silicon and Germanium Ultrathin Body (1 nm) Junctionless Field-Effect Transistor With Ultrashort Gate Length (1 nm and 3 nm)

Silicon (Si) and Germanium (Ge) ultrathin body junctionless field-effect transistor (UTB-JLFET) with L_G= 1 nm and L_G = 3 nm were demonstrated by solving the coupled drift-diffusion and density-gradient model. The simulation results show that the Si and Ge channel can be used in ultrashort channel device as long as UTB is employed. As UTB is employed, ultra-short channel device does not need to follow an empirical rule of T_eh = L_G/3. Furthermore, Ge UTB-JLFET 6T-SRAM cell has reasonable static noise margin value of 149 mV. The circuit performances reveal that UTB-JLFET can be used for sub-5-nm CMOS technology nodes.