Publication: Effects of C70 in pectin thin film on configurable Resistive switching chracteristics
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Date
2025-08
Authors
Wong, Yi Sheng
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Abstract
Although inorganic-based resistive switching (RS) devices have shown promising performance to fulfil the potential requirement of high-speed dense
memories, it can lead to the production of e-waste which harms the environment. Hence, bio-organic-based RS devices are developed as a sustainable alternative. The main objective of this research is to improve the RS performance of pectin derived from citrus peel RS device through comparing the effect of different Fullerene C70 concentration (0 wt%, 0.1 wt%, 0.2 wt%, 0.3 wt%, 0.4 wt%, 10 wt%, 20 wt%, 25 wt% and 30 wt%) incorporated into 5 mg/ml pectin precursor solution by solvent exchange technique to form a thin film, compliance current, number of sweeping cycles, and solvent used to functionalize C70 on the RS performance and different configurable memory mode of the device. A compliance current (Icc) is required for a ReRAM device in order to prevent the dielectric switching layer from permanently breaking down during the forming/setting process. Toluene and tetrahydrofuran (THF) were used as the solvents to functionalize 30 wt% of C70 to compare the effect of solvent used on the performance indicators of the device. The prepared precursor solutions were spin-coated onto ITO-coated PET substrates and dried at 140oC for 2 h before sputtered with gold/platinum top electrode. Fourier Transform Infrared (FTIR) Spectroscopy, Energy Dispersive X-ray (EDX) Spectroscopy, goniometer, zeta potential analyser, Atomic Force Microscopy (AFM), and Semiconductor Parameter Analyzer (SPA) were used to characterize the raw materials, dried memristive thin film, and RS behaviour of the memory devices. The results showed that the device with 25 wt% C70 showed the highest ON/OFF current ratio of 5.95 x 102, which is an increase of nearly 2 orders of magnitude compared with pristine pectin RS device. Using toluene gave better performance compared to using THF as a solvent for C70, with the 30 wt% (toluene) device having a higher ON/OFF current ratio of 1.40 x 102 compared to 30 wt% (THF) 3.45 x101, which is about 1 magnitude higher. The pristine pectin and 25 wt%-C70 pectin device exhibited configurable memory between non- memory, Write-Once Read-Many WORM, and bipolar RS by varying the Icc. In conclusion, this research shows the potential of C70 as a promising additive to enhance the RS performance in configurable bio-organic-based RS devices.