Suppressed Fin-LER Induced Variability in Negative Capacitance FinFETs

This letter investigates the impact of fin line-edge roughness (Fin-LER) on the intrinsic variation of negative capacitance FinFETs (NC-FinFETs) by TCAD atomistic simulation coupled with the Landau-Khalatnikov equation. We report a feedback mechanism stemming from the internal voltage amplification inherent in the negative capacitance FET. This feedback mechanism results in the superior immunity to Fin-LER-induced threshold-voltage and subthreshold-swing variations for NC-FinFETs as compared with the FinFET counterparts. This letter may provide insights for device/circuit designs using negative capacitance FETs.