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A High-Entropy-Oxides-Based Memristor: Outstanding Resistive Switching Performance and Mechanisms in Atomic
Jing-Yuan Tsai1, Jui-Yuan Chen2, Chun-Wei Huang3
1Department of Materials Science and Engineering, National Yang Ming Chiao Tung University, Hsinchu, 30010, Taiwan.
Advanced Materials (Deerfield Beach, Fla.)
|June 28, 2023
Summary
High-entropy oxides (HEOs) show promise for resistive random-access memory (RRAM) applications. This study reveals structural transformations in HEOs during RRAM operation, leading to excellent device performance.
Area of Science:
- Materials Science
- Solid-State Electronics
- Nanotechnology
Background:
- High-entropy oxides (HEOs) exhibit unique properties, including excellent electrochemical performance and cycling stability.
- The potential of HEOs in resistive random-access memory (RRAM) devices remains underexplored, with limited understanding of their switching mechanisms.
Purpose of the Study:
- To investigate the resistive-switching characteristics and mechanism of a novel high-entropy oxide.
- To explore the structural evolution of HEOs under RRAM operating conditions.
Main Methods:
- Epitaxial growth of HEO (Cr, Mn, Fe, Co, Ni)3O4 with a spinel structure on a Nb:STO substrate.
- Fabrication of Pt/HEO/Nb:STO devices for RRAM testing.
- Advanced characterization using transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM), X-ray photoelectron spectroscopy (XPS), and electron energy loss spectroscopy (EELS).
Main Results:
- The HEO material demonstrated exceptional resistive-switching properties, including a high on/off ratio (~10^5), robust endurance (>4550 cycles), and long retention time (>10^4 s).
- Structural analysis revealed a transformation from spinel to rock-salt structure in specific regions after resistive-switching operations.
- Valence state changes in specific elements were identified as the key factor driving the observed resistive-switching behavior.
Conclusions:
- High-entropy oxides are promising materials for next-generation RRAM devices.
- The observed structural and elemental valence changes are crucial for understanding and optimizing HEO-based RRAM performance.
- Further research into HEOs could lead to advancements in non-volatile memory technologies.
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