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Tunnel junction abruptness, source random dopant fluctuation and PBTI induced variability analysis of GaAs0.4Sb0.6/In0.65Ga0.35As heterojunction tunnel FETs

We present reliability analysis of the two most critical interfaces in III-V Heterojunction Tunnel FET (HTFET) design: (1) Tunnel Heterojunction is characterized in three-dimensional atomic scale resolution using Atom Probe Tomography. We explore the impact of tunnel junction abruptness and source dopant fluctuations on HTFET performance; (2) Extremely scaled Hi-K gate dielectric (sub-0.8 nm EOT: HfO2, HfO2-ZrO2 bilayer, and ZrO2)/ III-V channel interface is evaluated using Positive Bias Temperature Instability (PBTI) measurements. HfO2 based HTFET exhibits superior PBTI performance over ZrO2 based HTFET and shows lifetime improvement over III-V FinFET.