... TUNNELING FIELD- EFFECT TRANSISTORS FOR LOW POWER LOGIC: DESIGN, SIMULATION, AND TECHNOLOGY DEMONSTRATION YANG YUE (B ENG (HONS.)), NUS A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR ... relatively large bandgap, leading to a low band-to-band tunneling (BTBT) rate and low drive current for Si TFETs Therefore, novel structure designs and materials are need advance the TFET technology ... mr , Tunneling reduced mass for Γ - Γ direct band-to-band tunneling kg * mr ,L Tunneling reduced mass for Γ - L indirect band-to-band tunneling kg NA Acceptor concentration cm-3 N c , Effective...