Side Chain Redistribution as a Strategy to Boost Organic Electrochemical Transistor Performance and Stability

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Abstract
A series of glycolated polythiophenes for use in organic electrochemical transistors (OECTs) is designed and synthesized, differing in the distribution of their ethylene glycol chains that are tethered to the conjugated backbone. While side chain redistribution does not have a significant impact on the optoelectronic properties of the polymers, this molecular engineering strategy strongly impacts the water uptake achieved in the polymers. By careful optimization of the water uptake in the polymer films, OECTs with unprecedented steady‐state performances in terms of [μC*] and current retentions up to 98% over 700 electrochemical switching cycles are developed.
Funding Information
  • King Abdullah University of Science and Technology (OSR‐2018‐CARF/CCF‐3079, OSR‐2015‐CRG4‐2572, OSR‐4106 CPF2019, 610115)
  • Engineering and Physical Sciences Research Council (EP/G037515/1, EP/M005143/1, EP/L016702/1)
  • Knut och Alice Wallenbergs Stiftelse
  • Wallenberg Wood Science Center (KAW 2018.0452)
  • TomKat Center for Sustainable Energy, Stanford University

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