Tunable electrical field-induced metal-insulator phase separation in LiCoO2 synaptic transistor operating in post-percolation region

Zhang, W. and Chen, Y. and Xu, C. and Lin, C. and Tao, J. and Lin, Y. and Li, J. and Kolosov, O.V. and Huang, Z. (2023) Tunable electrical field-induced metal-insulator phase separation in LiCoO2 synaptic transistor operating in post-percolation region. Nano Energy, 108: 108199. ISSN 2211-2855

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While mixed ionic-electronic conductors with metal-insulator transition (MIT) are promising candidates for designing neuromorphic computing hardware, the fundamentals of resistive switching in these materials are yet to be well understood. This work studies the switching mechanism of the three-terminal nonvolatile redox transistor (NVRT) containing the LiCoO2 (LCO) channel layer with tunable preferred crystallographic orientation. We used atomic force microscope nanotomography to reconstruct the 3D conductance map of NVRTs, that reveals the applied gate electric-field induces the MIT via reversible phase separation in the LCO channel layer, with the nonequilibrium thermodynamics analytical model providing validation to this mechanism. By operating in the post-percolation region, the memory properties can continuously adjust the conductance states of NVRTs. The percolation conductance mechanism via the metallic LCO phase ensures the exceptional linearity and reproducibility of conductance modulation, whereas the field-, rather than current-, induced transition results in the low energy consumption replicating key features of the living neural cells.

Item Type:
Journal Article
Journal or Publication Title:
Nano Energy
Additional Information:
This is the author’s version of a work that was accepted for publication in Nano Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Nano Energy, 108, 2023 DOI: 10.1016/j.nanoen.2023.108199
Uncontrolled Keywords:
?? insulator-to-metal transitionlicoo2phase separationsynaptic transistorrenewable energy, sustainability and the environmentmaterials science(all)electrical and electronic engineering ??
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26 Jan 2023 14:00
Last Modified:
15 Jan 2024 00:21