A Novel Dopingless Fin-Shaped SiGe Channel TFET with Improved Performance

Area of Science:

• Semiconductor Device Physics
• Advanced Materials Science
• Nanoelectronics

Background:

• Traditional Tunnel Field-Effect Transistors (TFETs) face challenges with doping processes and performance limitations.
• Achieving efficient line tunneling junctions is crucial for high-performance TFETs.
• Reducing device footprint and improving manufacturing applicability are key goals in modern electronics.

Purpose of the Study:

• To propose and investigate a dopingless fin-shaped SiGe channel TFET (DF-TFET).
• To enhance on-state current, switching ratio, and reliability while minimizing off-state leakage.
• To explore the potential of DF-TFET for ultra-low-power applications.

Main Methods:

• Fabrication of a DF-TFET utilizing a fin-shaped SiGe channel and gate/source overlap.
• Integration of a high κ material stack gate dielectric.
• Analysis of device physics and parameter effects on performance.

Main Results:

• Achieved high on-state current (58.8 μA/μm) and an exceptional switching ratio of 12 orders of magnitude.
• Demonstrated minimal subthreshold swing (SSmin = 2.8 mV/dec) and no significant ambipolar effect.
• Obtained improved capacitance characteristics, leading to a cutoff frequency of 5.04 GHz and a gain bandwidth product of 1.29 GHz.

Conclusions:

• The proposed DF-TFET offers a promising solution for ultra-low-power electronics due to its high performance and robustness.
• The dopingless approach simplifies fabrication and enhances manufacturability.
• The fin structure and SiGe channel contribute to improved device characteristics and reduced footprint.