Abstract
Donor-acceptor copolymers featuring electron-deficient isoindigo units and electron-rich 3,4-ethylenedioxy (EDOT) groups are presented as new materials for accumulation mode organic electrochemical transistors (OECTs). Grafting hybrid alkyl-ethylene glycol side chains on the isoindigo units of the copolymer leads to OECTs with outstanding substrate adhesion and operational stability in contact with an aqueous electrolyte, as demonstrated by their preserved performance after extensive ultrasonication (1.5 h) or after continuous on-off switching for over 6 h. Hybrid side chains outperform copolymers with alkyl only or ethylene glycol only side chains, which retain only 27% and 10% of the on currents after 40 min of on-off switching, respectively, under the same biasing conditions. These devices are promising candidates for in vitro and in vivo bioelectronics, applications where stability as well as robust adhesion of the conjugated polymer to the substrate are essential.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 9797-9806 |
| Number of pages | 10 |
| Journal | Chemistry of Materials |
| Volume | 31 |
| Issue number | 23 |
| DOIs | |
| State | Published - Nov 11 2019 |
Bibliographical note
KAUST Repository Item: Exported on 2020-10-01Acknowledgements: The authors thank the National Natural Science Foundation of China (Grant Nos. 21875291 and 21702240) for the financial support. E.Z. thanks the Swedish Research Council (VR, International Postdoc Grant) and the Royal Swedish Academy of Sciences (Kungl. Vetenskapsakademiens stiftelser) for funding. A.H. thanks the Wallenberg foundation and Swedish Research Council (VR). This work was performed in part at the UNSW node of the Australian National Fabrication Facility, a company established under the National Collaborative Research Infrastructure Strategy to provide nano- and microfabrication facilities for Australia’s researchers.