Investigation of Fin-Width Sensitivity of Threshold Voltage for InGaAs and Si Negative-Capacitance FinFETs Considering Quantum-Confinement Effect

This paper investigates the fin-width (W_Fin) sensitivity of threshold voltage (V_T) for InGaAs and Si channel negative-capacitance FinFETs (NC-FinFETs) using a theoretically derived quantum subthreshold model corroborated with TCAD numerical simulation. Our study indicates that due to the action of negative capacitance, the NC-FinFET possesses smaller V_T sensitivity to W_Fin than the FinFET counterpart. In addition, we point out and demonstrate that a device design with higher internal voltage amplification can be utilized to further reduce the V_Tsensitivity to W_Finfor NC-FinFETs. Our study may provide insights for future scaling of FinFETs.