High performing solid-state organic electrochemical transistors enabled by glycolated polythiophene and ion-gel electrolyte with a wide operation temperature range from -50 to 110 °C

• Main Authors: Wu, Xihu, Chen, Shuai, Moser, Maximilian, Moudgil, Akshay, Griggs, Sophie, Marks, Adam, Li, Ting, McCulloch, Iain, Leong, Wei Lin
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2023
• Subjects: Engineering::Electrical and electronic engineering; Organic Electrochemical Transistor; Solid-State Electrolyte; Temperature Resilient; Wearable Electronics
• Online Access: https://hdl.handle.net/10356/164343
• Institution: Nanyang Technological University

The development of organic electrochemical transistors (OECTs) capable of maintaining their high amplification, fast transient speed, and operational stability in harsh environments will advance the growth of next-generation wearable & biological electronics. In this work, we successfully demonstrated a high performance solid-state OECT (SSOECT), showing a recorded high transconductance of 220 ± 59 S/cm, ultrafast device speed of ~10 kHz with excellent operational stability over 10000 switching cycles and thermally stable under a wide temperature range from -50 to 110 °C. The developed SSOECTs were successfully used to detect low-amplitude physiological signals, showing a high signal-to-noise-ratio (SNR) of 32.5±2.1 dB. For the first time, the amplifying power of these SSOECTs was also retained and reliably shown to collect high-quality electrophysiological signals even under harsh temperatures (-50°C and 110°C). The demonstration of high-performing SSOECTs and its application in harsh environment are core steps toward their implementation in next-generation wearable electronics & bioelectronics.