Multibridge VO2-Based Resistive Switching Devices in a Two-Terminal Configuration

TL;DR

This paper demonstrates that incorporating multiple VO2 bridges in a two-terminal device enables a wide range of resistive states and complex switching behaviors, advancing potential applications in neuromorphic computing and tunable electronics.

Contribution

It introduces a multibridge VO2 device architecture that achieves multiple resistance states and explores thermal crosstalk effects on switching characteristics.

Findings

Multiple resistance states are achievable with multibridge configurations.

Thermal crosstalk influences the switching behavior of the devices.

Scanning Thermal Microscopy reveals current distribution patterns.

Abstract

Vanadium dioxide (VO2) exhibits a hysteretic insulator-to-metal transition near room temperature, forming the foundation for various forms of resistive switching devices. Usually, these are realized in the form of two-terminal bridge-like structures. We show here that by incorporating multiple, parallel VO2 bridges in a single two-terminal device, a wider range of possible characteristics can be obtained, including a manifold of addressable resistance states. Different device configurations are studied, in which the number of bridges, the bridge dimensions and the interbridge distances are varied. The switching characteristics of the multibridge devices are influenced by the thermal crosstalk between the bridges. Scanning Thermal Microscopy has been used to image the current distributions at various voltage/current bias conditions. This work presents a route to realize devices exhibiting highly non-linear, multistate current-voltage characteristics, with potential applications in e.g., tunable electronic components and novel, neuromorphic information processing circuitry.