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High-Indium-Composition, Ultra-Low-Power GaAsSb/InGaAs Heterojunction Tunnel Field-Effect Transistors.

Yan Liu1, Xiang Li1, Dao-Hua Zhang1

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Summary
This summary is machine-generated.

This study optimized Tunnel Field-Effect Transistors (TFETs) by adjusting In composition and doping. Higher In composition in the InGaAs layer improved device performance and tunneling capability.

Keywords:
GaAsSb/InGaAs heterojunctionparameter optimizationsubthreshold swingtunnel field-effect transistors (TFETs)

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Area of Science:

  • Semiconductor Device Physics
  • Materials Science

Background:

  • Tunnel Field-Effect Transistors (TFETs) offer potential for low-power electronics.
  • Optimizing heterojunctions is crucial for enhancing TFET performance.

Purpose of the Study:

  • To systematically investigate the impact of In composition in the intrinsic InGaAs layer and p-type doping concentration in the p-GaAsSb layer on TFET performance.
  • To explore the tunability of the p-GaAsSb/i-InxGa1-xAs heterojunction for self-off operation and high on-current.

Main Methods:

  • Technology Computer-Aided Design (TCAD) simulations were employed.
  • A non-local band-to-band tunneling model was utilized.
  • Systematic examination of varying In composition (x) and p-type doping concentrations.

Main Results:

  • Optimal device performance was achieved with an In composition of approximately 0.59 in the InGaAs layer, exceeding the lattice-matched 0.53 composition.
  • A moderate staggered band alignment was realized, enabling self-off at zero gate bias.
  • Minimum subthreshold swing of 13.51 mV/dec and ON-state current of 35.39 μA/μm at VDS = VGS = 0.5 V were obtained.

Conclusions:

  • The In composition in the intrinsic InGaAs layer is a critical parameter for TFET performance, with higher In content showing superior results.
  • The tunability of the p-GaAsSb/i-InxGa1-xAs heterojunction is a significant advantage for advanced TFET designs.
  • Optimized TFETs demonstrate enhanced tunneling capability, paving the way for more efficient electronic devices.