Frugal discrete memristive device based on potassium permanganate solution

• Published in: Materials research express Vol. 8; no. 7; pp. 76304 - 76316
• Main Authors: Revadekar, Chetan C, Takaloo, Ashkan Vakilipour, Shinde, Sandeep P, Patil, Swapnil R, Kundale, Somnath S, Kim, Deok-kee, Dongale, Tukaram D
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.07.2021
• Subjects: Analog circuits; Coefficient of variation; discrete device; electrochemical impendence spectroscopy; electrochemistry; Equivalent circuits; Memory devices; memristive switching; memristor; Memristors; Methanol; Molten salt electrolytes; Nyquist plots; Optimization; Potassium permanganate; Programmable logic devices; Solid electrolytes; Solvents; Statistical analysis; Thin films; Visible spectrum; volatile memory
• ISSN: 2053-1591; 2053-1591
• DOI: 10.1088/2053-1591/ac14fe

Abstract Many thin film-based devices with solid electrolytes have been studied for memristive applications. Herein, we report a simple and facile way to fabricate solution-based, low-cost, and discrete two-terminal memristive devices using the KMnO 4 solution. The water and methanol were used as a solvent to prepare different concentrations of KMnO 4 to carry out the optimization study. Furthermore, the effect of KMnO 4 concentration with aqueous and methanol solvents was studied with the help of current-voltage, device charge, charge-flux, and cyclic endurance properties. Interestingly, all developed devices show the asymmetric time-domain charge and double valued charge-flux properties, suggesting that aqueous KMnO 4 and methanol-KMnO 4 based devices are non-ideal memristors or memristive devices. The statistical measures such as cumulative probability and coefficient of variation are reported for the memristive devices. The possible switching mechanism of the discrete memristive was tried to explain with the UV-visible spectrum and theoretical framework. The optimized device was further studied using the cyclic voltammogram, Bode plot, and Nyquist plot. An equivalent circuit was derived for the optimized discrete memristive device using electrochemical impendence spectroscopy results. The results of the present investigation are beneficial to develop programmable analog circuits, volatile memory, and synaptic devices using discrete memristive devices.