Development of flexible organic electrochemical transistor based on biopolymer electrolyte and its performance optimization / Bo Sun

Bo , Sun (2025) Development of flexible organic electrochemical transistor based on biopolymer electrolyte and its performance optimization / Bo Sun. Masters thesis, Universiti Malaya.

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Abstract

Neuromorphic devices are gaining attention for their ability to mimic biological synapses, with organic electrochemical transistors (OECTs) emerging as promising candidates due to their high transconductance, low voltage operation, and strong electrolyte gating. However, conventional OECTs often rely on liquid electrolytes or synthetic polymers, posing challenges in stability, sustainability, and scalability. In this study, we develop a biodegradable, flexible OECT using a solid-state chitosan-based biopolymer electrolyte, a PEDOT:PSS semiconductor channel, and a low-cost screen-printing process, enabling scalable fabrication. The chitosan electrolyte, reinforced with salt, enhances ion transport, charge carrier density, and electric double layer (EDL) formation, improving device performance. Our optimized OECTs achieve an on-state current of 0.19 ± 0.03 mA at 0.6 V, an on/off ratio of 0.3 × 10³, and a transconductance of 0.416 ± 0.05 mS, while maintaining mechanical robustness over 300 bending cycles and thermal stability from 30 to 75 °C. The biodegradable electrolyte offers an environmentally friendly alternative, reducing electronic waste and enabling sustainable transient electronics. This study introduces one of the latest solid-state polymer electrolytes for OECTs, demonstrating how electrolyte engineering can optimize ion transport and interfacial dynamics. With scalable fabrication, competitive performance, and eco-friendly design, this work provides a promising approach for bioelectronics, neuromorphic computing, and AI-driven applications.

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