Multifunctional Reconfigurable Operations in an Ultra-Scaled Ferroelectric Negative Transconductance Transistor.

Area of Science:

• Materials Science
• Electrical Engineering
• Nanotechnology

Background:

• Moore's Law scaling necessitates increased functional density in electronic circuits.
• Ferroelectric materials offer nonvolatile memory capabilities.
• Antiambipolar transistors exhibit negative transconductance, enabling unique circuit behaviors.

Purpose of the Study:

• To develop ultrascaled ferroelectric, antiambipolar transistors (ferro-AATs).
• To demonstrate reconfigurable digital and analog functionalities using ferro-AATs.
• To explore applications in content addressable memory (CAM) and analog signal processing.

Main Methods:

• Integration of a hafnia-based ferroelectric gate stack on a vertical nanowire tunnel field-effect transistor.
• Engineering of gate/source overlap and tunnel junctions to enhance antiambipolarity.
• Experimental validation of ferro-AATs in CAM and analog signal processing circuits.

Main Results:

• Demonstrated robust negative transconductance reconfigurable via ferroelectric polarization.
• Achieved sub-picojoule operation for single-transistor CAM cells with a footprint of ~0.01 μm².
• Attained multistate reconfigurations and >95% power conversion efficiency in analog signal modulation.

Conclusions:

• Ferro-AATs enable operation beyond conventional transistors, offering multiple reconfigurable functionalities.
• The ultrascaled footprint and low power consumption of ferro-AATs are suitable for next-generation electronics.
• This technology significantly reduces analog circuit design complexity and enhances data search capabilities.