Strain-Engineering Induced Anisotropic Crystallite Orientation and Maximized Carrier Mobility for High-Performance Microfiber-Based Organic Bioelectronic Devices

Youngseok Kim, Hyebin Noh, Bryan D. Paulsen, Jiwoong Kim, Il Young Jo, Hyung Ju Ahn, Jonathan Rivnay, Myung Han Yoon*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Despite the importance of carrier mobility, recent research efforts have been mainly focused on the improvement of volumetric capacitance in order to maximize the figure-of-merit, μC* (product of carrier mobility and volumetric capacitance), for high-performance organic electrochemical transistors. Herein, high-performance microfiber-based organic electrochemical transistors with unprecedentedly large μC* using highly ordered crystalline poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) microfibers with very high carrier mobilities are reported. The strain engineering via uniaxial tension is employed in combination with solvent-mediated crystallization in the course of drying coagulated fibers, resulting in the permanent preferential alignment of crystalline PEDOT:PSS domains along the fiber direction, which is verified by atomic force microscopy and transmission wide-angle X-ray scattering. The resultant strain-engineered microfibers exhibit very high carrier mobility (12.9 cm2 V−1 s−1) without the trade-off in volumetric capacitance (122 F cm−3) and hole density (5.8 × 1020 cm−3). Such advantageous electrical and electrochemical characteristics offer the benchmark parameter of μC* over ≈1500 F cm−1V−1s−1, which is the highest metric ever reported in the literature and can be beneficial for realizing a new class of substrate-free fibrillar and/or textile bioelectronics in the configuration of electrochemical transistors and/or electrochemical ion pumps.

Original languageEnglish (US)
Article number2007550
JournalAdvanced Materials
Volume33
Issue number10
DOIs
StatePublished - Mar 11 2021

Keywords

  • conducting polymers
  • mixed conductors
  • organic electrochemical transistors
  • poly(3,4-ethylenedioxythiophene):polystyrene sulfonate
  • strain engineering

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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