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Low-voltage flexible organic transistors utilizing passivated polyelectrolyte dielectrics for tactile sensing and
Xiaoyan Wang1, Zhigang Yin2, Changdong Liu2
1College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, China; State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China; State Key Laboratory of Power Transmission Equipment Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China; Fujian College, University of Chinese Academy of Sciences, Fuzhou 350002, China.
Abstract:
Organic field-effect transistors (OFETs) utilizing polyelectrolyte dielectrics offer low-power operation and good signal amplification, making them well suited to pressure sensor applications. However, pristine polyelectrolyte dielectrics suffer from high leakage currents and instability under device operation. Here, we develop novel passivated polyelectrolyte dielectrics to enhance electrical performance of low-voltage flexible OFETs, achieving the reduced hysteresis and the significantly improved mobility from 0.04 to 1.17 cm2 V-1 s-1. The optimized OFETs with passivated polyelectrolyte dielectrics are integrated as flexible pressure sensors, affording high sensitivity (297.2 kPa-1) at -2 V, wide response range (0-70.1 kPa), and fast response in milliseconds. Inspired by human skin, the OFET pressure sensor successfully simulates biological synaptic behaviors, including excitatory postsynaptic currents, paired-pulse facilitation, and the transition from short-term memory to long-term memory, which are crucial for processing complex signals. Furthermore, intelligent touch recognition of braille characters with an accuracy of ∼98% is achieved by designing the low-voltage OFET pressure sensor array and combining it with algorithms. These results provide new insights into advanced dielectrics and low-power OFET sensors for potential applications in skin-like artificial synapses, and human-machine interaction systems.