Presentation Information
[17a-PA2-6]Designing Asymmetric Memristive Behavior in Proton Mixed Conductors for Neuromorphic Applications
〇(PC)Nada HussienAminMohamed Besisa1, Masaki Tsuji1, Yoshihiro Furue1, Satya P. Pati2, Satoshi Hamasuna1, Takeaki Yajima1 (1.Kyushu University, 2.North-Eastern Hill University)
Keywords:
neuromorphic engineering,conductance modulation,electrochemical impedance spectroscopy (EIS)
Solid-state devices incorporating mobile ionic species, such as protons, are emerging as promising platforms for next-generation neuromorphic computing. Unlike conventional electronic devices, whose behavior can be readily predicted using well-established band diagrams, the design in the mixed conduction regime of both ions and electrons remains challenging due to the complex interplay between electronic and ionic transport mechanisms. In this work, we elucidate a fundamental design principle by leveraging the proton-electron coupling at the interface of proton-conducting mixed ionic-electronic conductors. This approach enables the realization of unconventional asymmetric memristive behavior, exhibiting a pronounced temporal asymmetry with a gradual conductance increase by voltage and a rapid relaxation to the initial state without voltage, just like a stretched rubber band suddenly let go. Such rubber-like memristive behaviors are advantageous for read-write operation with only two voltage levels implifying circuit integration of neuromorphic information processing (Fig. 1). Moreover, we demonstrate that the device's operational state can be reversibly modulated by ambient humidity, enabling ON/OFF switching through external chemical cues (Fig. 2). This behavior mimics hormone-like modulation observed in biological neural systems, highlighting the potential for environmentally responsive neuromorphic architectures. Together, these findings offer a robust framework for the rational design of bioinspired ionic devices, opening new pathways for multifunctional platforms based on protonic materials.