High-Hole-Mobility Fiber Organic Electrochemical Transistors for Next-Generation Adaptive Neuromorphic Bio-Hybrid Technologies

Paula Alarcon-Espejo, Ruben Sarabia-Riquelme, Giovanni Maria Matrone, Maryam Shahi, Siamak Mahmoudi, Gehan S. Rupasinghe, Vianna N. Le, Antonio M. Mantica, Dali Qian, T. John Balk, Jonathan Rivnay, Matthew Weisenberger, Alexandra F. Paterson

Research output: Contribution to journalArticlepeer-review

Abstract

The latest developments in fiber design and materials science are paving the way for fibers to evolve from parts in passive components to functional parts in active fabrics. Designing conformable, organic electrochemical transistor (OECT) structures using poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) fibers has excellent potential for low-cost wearable bioelectronics, bio-hybrid devices, and adaptive neuromorphic technologies. However, to achieve high-performance, stable devices from PEDOT:PSS fibers, approaches are required to form electrodes on fibers with small diameters and poor wettability, that leads to irregular coatings. Additionally, PEDOT:PSS-fiber fabrication needs to move away from small batch processing to roll-to-roll or continuous processing. Here, it is shown that synergistic effects from a superior electrode/organic interface, and exceptional fiber alignment from continuous processing, enable PEDOT:PSS fiber-OECTs with stable contacts, high µC* product (1570.5 F cm−1 V−1 s−1), and high hole mobility over 45 cm2 V−1 s−1. Fiber-electrochemical neuromorphic organic devices (fiber-ENODes) are developed to demonstrate that the high mobility fibers are promising building blocks for future bio-hybrid technologies. The fiber-ENODes demonstrate synaptic weight update in response to dopamine, as well as a form factor closely matching the neuronal axon terminal.

Original languageEnglish
Article number2305371
JournalAdvanced Materials
Volume36
Issue number11
DOIs
StatePublished - Mar 14 2024

Bibliographical note

Publisher Copyright:
© 2023 Wiley-VCH GmbH.

Keywords

  • bio-hybrid technologies
  • contact engineering
  • hole mobility
  • organic electrochemical transistors
  • organic electronics

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering

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