Issue 17, 2024

Origin of discrete resistive switching in chemically heterogeneous vanadium oxide crystals

Abstract

Phase changes in oxide materials such as VO2 offer a foundational platform for designing novel solid-state devices. Tuning the V : O stoichiometry offers a vast electronic phase space with non-trivial collective properties. Here, we report the observation of discrete threshold switching voltages (Vth) with constant ΔVth between cycles in vanadium oxide crystals. The observed threshold fields over 10 000 cycles are ∼100× lower than that noted for stoichiometric VO2 and show unique discrete behaviour with constant ΔVth. We correlate the observed discrete memristor behaviour with the valence change mechanism and fluctuations in the chemical composition of spatially distributed VO2–VnO2n−1 complex oxide phases that can synergistically co-operate with the insulator–metal transition resulting in sharp current jumps. The design of chemical heterogeneity in oxide crystals, therefore, offers an intriguing path to realizing low-energy neuromorphic devices.

Graphical abstract: Origin of discrete resistive switching in chemically heterogeneous vanadium oxide crystals

Supplementary files

Article information

Article type
Communication
Submitted
10 1 2024
Accepted
10 6 2024
First published
11 6 2024

Mater. Horiz., 2024,11, 4086-4093

Origin of discrete resistive switching in chemically heterogeneous vanadium oxide crystals

B. R. Naik, Y. Chandran, K. Rohini, D. Verma, S. Ramanathan and V. Balakrishnan, Mater. Horiz., 2024, 11, 4086 DOI: 10.1039/D4MH00034J

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