Performance Modulation Of Water-soluble Polymer-based Organic Memristors

With the rise of the digital wave,including big data,the Internet of Things（Io T）,artificial intelligence（AI）,and fifth-generation mobile networks,the amount of data generated by humans has grown exponentially.The production scale of electronic components is enormous,leading to the inevitable generation of electronic waste.Therefore,the development of green electronic devices that can be environmentally friendly,easily degradable,and capable of multifunctional integration has gained significant attention.Memristors,with advantages such as multistate storage and nonlinear computation,exhibit high similarity to biological synapses in terms of structure,physical behavior,and functionality.They can effectively reduce the time and energy consumption required for data interaction between computing units and memory units,making them a hot research topic in the field of emerging memory technologies.To achieve the green manufacturing of memristors,a key approach is the utilization of water-based processing.Solvents used in the preparation of water-soluble polymer materials are typically water or other environmentally friendly solvents.In this study,a water-soluble polymer,（Polyvinylpyrrolidone,PVPy）was used as the resistive switching layer to fabricate organic memristors.The diverse modulation of biomimetic functionalities was achieved through the electron-ion coupling.The specific research content is as follows:Firstly,an Al/PVPy/ITO memristor device was fabricated.The memristive behavior as proton conduction mechanism was investigated through impedance measurements at different humidities,unit area capacitance testing,and electrical characterization.Furthermore,based on the previously proposed Al O_x interlayer strategy within the group,oxygen vacancies were introduced.By leveraging the synergistic effect between oxygen vacancies and protons,memristors with hysteresis characteristics were fabricated.The introduction of Al O_x interlayer reduced the reliance on environmental humidity during device operation.Building upon the previous sections,PVPy,suitable for doping as a water-soluble polymer host due to its hydrogen bonding capabilities,was further utilized to regulate the performance of the memristor.An organic oligomer（3,6-Bis（5-（4-（diphenylamino）phenyl）thiophen-2-yl）-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione,TPADPP）with favorable characteristics such as good planarity,strong electron affinity,and efficient bipolar charge carrier transport,was selected for doping into the polymer as trapping sites.The fabricated memristors incorporating the organic oligomer enabled behavior simulation of action potential firing of neurons through pulse width/amplitude modulation,thereby opening up avenues to diversify the functional combinations of organic memristors.Finally,an organic memristor with the structure of Al/Al O_x/PVPy:Au NPs/ITO was fabricated to further explore the multifunctional integration application of organic memristors.This device could simulate the process of action potential firing of neurons at low voltages（below±1 V）and exhibited threshold switching behavior at high voltages（above 3 V）.By appropriately controlling the compliance current(I_CC),the device exhibited reconfigurability between the two aforementioned electrical behaviors.Leveraging the threshold switching characteristics of the device,the corresponding features of human sensory perception,such as those of a pain receptor,were simulated.