Physical Origin of Negative Differential Resistance in V3 O5 and Its Application as a Solid-State Oscillator

Bibliographische Detailangaben
Veröffentlicht in:	Advanced materials (Deerfield Beach, Fla.). - 1998. - 35(2023), 8 vom: 01. Feb., Seite e2208477
1. Verfasser:	Das, Sujan Kumar (VerfasserIn)
Weitere Verfasser:	Nandi, Sanjoy Kumar, Marquez, Camilo Verbel, Rúa, Armando, Uenuma, Mutsunori, Puyoo, Etienne, Nath, Shimul Kanti, Albertini, David, Baboux, Nicolas, Lu, Teng, Liu, Yun, Haeger, Tobias, Heiderhoff, Ralf, Riedl, Thomas, Ratcliff, Thomas, Elliman, Robert Glen
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2023
Zugriff auf das übergeordnete Werk:	Advanced materials (Deerfield Beach, Fla.)
Schlagworte:	Journal Article V3O5 metal-insulator transition negative differential resistance neuromorphic computing threshold switching

Beschreibung
Zusammenfassung:	© 2022 The Authors. Advanced Materials published by Wiley-VCH GmbH. Oxides that exhibit an insulator-metal transition can be used to fabricate energy-efficient relaxation oscillators for use in hardware-based neural networks but there are very few oxides with transition temperatures above room temperature. Here the structural, electrical, and thermal properties of V3 O5 thin films and their application as the functional oxide in metal/oxide/metal relaxation oscillators are reported. The V3 O5 devices show electroforming-free volatile threshold switching and negative differential resistance (NDR) with stable (<3% variation) cycle-to-cycle operation. The physical mechanisms underpinning these characteristics are investigated using a combination of electrical measurements, in situ thermal imaging, and device modeling. This shows that conduction is confined to a narrow filamentary path due to self-confinement of the current distribution and that the NDR response is initiated at temperatures well below the insulator-metal transition temperature where it is dominated by the temperature-dependent conductivity of the insulating phase. Finally, the dynamics of individual and coupled V3 O5 -based relaxation oscillators is reported, showing that capacitively coupled devices exhibit rich non-linear dynamics, including frequency and phase synchronization. These results establish V3 O5 as a new functional material for volatile threshold switching and advance the development of robust solid-state neurons for neuromorphic computing
Beschreibung:	Date Completed 24.02.2023 Date Revised 24.02.2023 published: Print-Electronic Citation Status PubMed-not-MEDLINE
ISSN:	1521-4095
DOI:	10.1002/adma.202208477