[16a-K203-1~9] 6.3 酸化物エレクトロニクス

11:15 〜 11:30英語発表

[16a-K203-8] Electrochemical impedance spectroscopy of artificial protonic synaptic devices

〇Nada HussienAminMohamed Besisa¹, K. Tsuruda¹, M. Tsuji¹, S. Hamasuna¹, S. P. Pati², Takeaki Yajima¹ (1.Kyushu University, 2.Hill University)

キーワード：

Electrochemical impedance spectroscopy (EIS)、2-terminal protonic device、Thin film

Biological neural systems effectively process information in real-time using diverse slow dynamics. Replicating these dynamics in scalable electronic devices has been challenging, especially for operations on time scales ranging from seconds to minutes. This study explores the use of slow proton dynamics in amorphous tungsten oxide (WO₃) for volatile resistance changes in a 2-terminal protonic device, aiming to replicate real-time information processing similar to biological neural systems. By applying a voltage below 1 V, hydrogenation or dehydrogenation of WO₃ occurs at a Pd electrode, causing significant changes in electronic conductance, which enables short-term information storage. However, the mechanism behind the proton-induced conduction modulation whether it occurs primarily in the bulk or at the interface remained unclear. To address this, we conducted electrochemical impedance spectroscopy within frequency range 100 kHz- 10 mHz, analyzed the voltage-dependent Nyquist plots, and current-dependent Nyquist plots. These plots revealed two semicircles at different frequencies, corresponding to bulk and interfacial impedance. The results showed that both the bulk and the interface contribute to the conductance modulation, providing a deeper understanding of the device's electric transport behavior.