A double layer 2-terminal device is employed to show Na-controlled interfacial resistive switching and neuromorphic behavior. The bilayer is based on interfacing biocompatible NaNbO3 and Nb2O5, which allows the reversible uptake of Na+ in the Nb2O5 layer. We demonstrate voltage-controlled interfacial barrier tuning via Na+ transfer, enabling conductivity modulation and spike-amplitude- and spike-timing-dependent plasticity. The neuromorphic behavior controlled by Na+ ion dynamics in biocompatible materials shows potential for future low-power sensing electronics and smart wearables with local processing.
Funding Agencies|H2020 European Research Council [EP/S022953/1]; Royal Academy of Engineering Chair in Emerging Technologies grant [CIET1819\24]; ERC [882929 EROS]; Leverhulme Trust [VP1-2023-045]; Royal Society [RGS\R1\221262]; EPSRC [EP/X034593/1]; Winton Programme for the Physics of Sustainability; ERC - Swedish Research Council (VR) [2019-00191, 2021-00357]; University of Cambridge's "Knowledge Exchange and Impact award", CAPE BlueSky Research Award [2022]; Higher Education Innovation Fund (HEIF); Cambridge Royce facilities grant [EP/P024947/1]; Sir Henry Royce Institute [EP/R00661X/1]