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Performance Analysis and Optimization of an InGaAs/GaAsSb Heterojunction Dopingless Tunnel FET with a Heterogate
JunJie Huang1, HongXia Liu1, Shupeng Chen1
1Key Laboratory for Wide Band Gap Semiconductor Materials and Devices of Education, School of Microelectronics, Xidian University, Xi'an 710071, China.
Micromachines
|December 31, 2025
Summary
A novel dopingless Tunnel FET utilizes an InGaAs/GaAsSb heterojunction and heterogate dielectric for enhanced low-power performance. This design achieves high on-state current and steep switching, ideal for advanced electronics.
Area of Science:
- Semiconductor Device Physics
- Materials Science
- Nanoelectronics
Background:
- Traditional Tunnel Field-Effect Transistors (TFETs) face challenges in achieving high performance and low power consumption.
- Dopingless TFETs offer a promising alternative by simplifying fabrication and reducing leakage currents.
- Optimizing heterojunctions and gate structures is crucial for enhancing TFET characteristics.
Purpose of the Study:
- To propose and investigate a novel InGaAs/GaAsSb heterojunction dopingless Tunnel FET (HDL-TFET) with a heterogate dielectric.
- To enhance the tunneling efficiency and on-state current (ION) for low-power applications.
- To suppress off-state current (IOFF), reduce ambipolar behavior, and improve radio frequency (RF) performance.
Main Methods:
- Employing an InGaAs/GaAsSb heterojunction with a quasi-broken gap energy band structure.
- Utilizing a dual-electrode structure to optimize carrier distribution and tunneling.
- Introducing a heterogate dielectric structure to mitigate off-state leakage and parasitic capacitance.
Main Results:
- The HDL-TFET achieved a high ION of 8.33 × 10-5 A/μm and a steep average subthreshold swing (SSavg) of 10.18 mV/dec at 0.5 V.
- An extremely low IOFF of 3.42 × 10-15 A/μm resulted in an impressive ION/IOFF ratio of 2.44 × 1010 with negligible ambipolar current.
- Significant improvements in RF performance were observed, including peak transconductance (Gm) of 333 μS/μm, peak cutoff frequency (fT) of 64 GHz, and gain bandwidth product (GBP) of 49 GHz.
Conclusions:
- The proposed HDL-TFET demonstrates superior performance compared to existing devices, making it suitable for low-power electronics.
- The integration of the heterogate dielectric and dual-electrode structure effectively enhances both DC and RF characteristics.
- This advanced TFET design offers a promising pathway for next-generation high-performance, energy-efficient electronic devices.
Keywords:
DC and RFInGaAs/GaAsSb heterojunctionband-to-band tunnelingdopingless TFETheterogate dielectricMore Related Videos
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