Toward Stable p-Type Thiophene-Based Organic Electrochemical Transistors

Silan Zhang, Penghui Ding, Tero Petri Ruoko, Ruiheng Wu, Marc Antoine Stoeckel, Matteo Massetti, Tiefeng Liu, Mikhail Vagin, Dilara Meli, Renee Kroon, Jonathan Rivnay, Simone Fabiano*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Operational stability is essential for the success of organic electrochemical transistors (OECTs) in bioelectronics. The oxygen reduction reaction (ORR) is a common electrochemical side reaction that can compromise the stability of OECTs, but the relationship between ORR and materials degradation is poorly understood. In this study, the impact of ORR on the stability and degradation mechanisms of thiophene-based OECTs is investigated. The findings show that an increase in pH during ORR leads to the degradation of the polymer backbone. By using a protective polymer glue layer between the semiconductor channel and the aqueous electrolyte, ORR is effectively suppressed and the stability of the OECTs is significantly improved, resulting in current retention of nearly 90% for ≈2 h cycling in the saturation regime.

Original languageEnglish (US)
Article number2302249
JournalAdvanced Functional Materials
Issue number40
StatePublished - Oct 2 2023


  • degradation
  • organic electrochemical transistors
  • p-type OECTs
  • stability

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • General Chemistry
  • Biomaterials
  • General Materials Science
  • Condensed Matter Physics
  • Electrochemistry


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