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Unconventional film morphologies for stretchable electrochemical transistors
1 Northwestern University 2145 Sheridan Road, Evanston IL, 60208 USA
*Email: a-facchetti@northwestern.edu
Abstract
The realization of fully stretchable electronic materials is central to advancing new types of mechanically agile and skin-integrable optoelectronic device technologies. In this presentation we report a materials design concept combining a porous organic semiconductor honeycomb film morphology with a biaxially pre-stretched platform that enables high-performance organic electrochemical transistors (OECTs) with charge transport stability up to 30-140% tensional strain, limited only by metal contact fatigue. The pre-stretched honeycomb channel semiconductor, donor-acceptor polymer DPP-g2T (DPP=diketopyrrolopyrrole, 2T=dithiophene), exhibits high ion uptake with ultra-stable electrochemical and mechanical properties, > 1500 redox cycles with 10000 stretching cycles under 30% strain. Highly reliable electrocardiogram recording cycles and synapse responses under varying strains, along with mechanical finite element analysis, underscore that the present stretchable OECT design strategy is suitable for diverse applications requiring stable signal output under deformation with low power dissipation and robustness to mechanical deformation.
Reference
1. Chen, J.; Huang, W.; Zheng, D.; Xie, Z.; Zhuang, X.; Zhao, D.; Chen, Y.; Su, N.; Chen, H.; Pankow, R. M.; Gao, Z.; Yu, J. Guo, X.; Cheng, Y.; Strzalka, J.; Yu, X.; Marks, T. J.; Facchetti, A. Highly-Stretchable Organic Electrochemical Transistors with Strain-Resistant Performance Nature. Mater. 2022, 21, 564–571.
2. Huang, L.; Wang, Z.; Chen, J.; Wang, B.; Chen, Y.; Huang, W.; Chi, L.; Marks, T. J.; Facchetti, A. Porous Semiconducting Polymers Enable High-Performance Electrochemical Transistors. Adv. Mater. (Weinheim, Ger.) 2021, 33(14), 2007041.
Author introduction
Antonio Facchetti is a co-founder and currently the Chief Technology Officer of Flexterra Corporation. He is also an Adjunct Professor at Northwestern University and a Guest Professor at Linkoping University. He has published more than 550 research articles, 15 book chapters, and holds more than 130 patents. He received the ACS Award for Creative Invention, the Giulio Natta Gold Medal of the Italian Chemical Society, the team IDTechEx Printed Electronics Europe Award, the corporate Flextech Award. He is a Fellow of the European Academy of Sciences, National Academy of Inventors, MRS, AAAS, PMSE, Kavli, and RSC.