Stretchable Redox-Active Semiconducting Polymers for High-Performance Organic Electrochemical Transistors

Yahao Dai, Shilei Dai, Nan Li, Yang Li, Maximilian Moser, Joseph Strzalka, Aleksander Prominski, Youdi Liu, Qingteng Zhang, Songsong Li, Huawei Hu, Wei Liu, Shivani Chatterji, Ping Cheng, Bozhi Tian, Iain McCulloch, Jie Xu, Sihong Wang

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

Organic electrochemical transistors (OECTs) represent an emerging device platform for next-generation bioelectronics owing to the uniquely high amplification and sensitivity to biological signals. For achieving seamless tissue–electronics interfaces for accurate signal acquisition, skin-like softness and stretchability are essential requirements, but they have not yet been imparted onto high-performance OECTs, largely due to the lack of stretchable redox-active semiconducting polymers. Here, a stretchable semiconductor is reported for OECT devices, namely poly(2-(3,3′-bis(2-(2-(2-methoxyethoxy)ethoxy)ethoxy)-[2,2′-bithiophen]-5)yl thiophene) (p(g2T-T)), which gives exceptional stretchability over 200% strain and 5000 repeated stretching cycles, together with OECT performance on par with the state-of-the-art. Validated by systematic characterizations and comparisons of different polymers, the key design features of this polymer that enable the combination of high stretchability and high OECT performance are a nonlinear backbone architecture, a moderate side-chain density, and a sufficiently high molecular weight. Using this highly stretchable polymer semiconductor, an intrinsically stretchable OECT is fabricated with high normalized transconductance (≈223 S cm−1) and biaxial stretchability up to 100% strain. Furthermore, on-skin electrocardiogram (ECG) recording is demonstrated, which combines built-in amplification and unprecedented skin conformability.

Original languageEnglish (US)
Article number2201178
JournalAdvanced Materials
Volume34
Issue number23
DOIs
StatePublished - Jun 9 2022
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering

Keywords

  • organic electrochemical transistors
  • redox-active polymer semiconductors
  • stretchable electronics

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