Voltage-triggered Ultra-fast Metal-insulator Transition in Vanadium Dioxide Switches

TL;DR

This paper demonstrates that vanadium dioxide (VO2) switches between metallic and insulating states within 2 nanoseconds when triggered by voltage pulses, showing promise for high-speed electronic applications.

Contribution

The study introduces a fabrication method for VO2 MIM structures and shows reproducible ultra-fast switching at room temperature with high ON/OFF ratios.

Findings

Voltage pulses can induce metal-insulator transition within 2 ns.

High ON/OFF current ratio (>100x) achieved with good endurance.

Clear correlation between electrical switching and thermal resistance change.

Abstract

Electrically driven metal-insulator transition in vanadium dioxide (VO2) is of interest in emerging memory devices, neural computation, and high speed electronics. We report on the fabrication of out-of-plane VO2 metal-insulator-metal (MIM) structures and reproducible high-speed switching measurements in these two-terminal devices. We have observed a clear correlation between electrically-driven ON/OFF current ratio and thermally-induced resistance change during metal-insulator transition. It is also found that sharp metal-insulator transition could be triggered by external voltage pulses within 2 ns at room temperature and the achieved ON/OFF ratio is greater than two orders of magnitude with good endurance.