Controlling Electrochemically Induced Volume Changes in Conjugated Polymers by Chemical Design: from Theory to Devices

Maximilian Moser, Johannes Gladisch, Sarbani Ghosh, Tania Cecilia Hidalgo, James F. Ponder, Rajendar Sheelamanthula, Quentin Thiburce, Nicola Gasparini, Andrew Wadsworth, Alberto Salleo, Sahika Inal, Magnus Berggren, Igor Zozoulenko, Eleni Stavrinidou, Iain McCulloch

Research output: Contribution to journalArticlepeer-review

Abstract

Electrochemically induced volume changes in organic mixed ionic-electronic conductors (OMIECs) are particularly important for their use in dynamic microfiltration systems, biomedical machinery, and electronic devices. Although significant advances have been made to maximize the dimensional changes that can be accomplished by OMIECs, there is currently limited understanding of how changes in their molecular structures impact their underpinning fundamental processes and their performance in electronic devices. Herein, a series of ethylene glycol functionalized conjugated polymers is synthesized, and their electromechanical properties are evaluated through a combined approach of experimental measurements and molecular dynamics simulations. As demonstrated, alterations in the molecular structure of OMIECs impact numerous processes occurring during their electrochemical swelling, with sidechain length shortening decreasing the number of incorporated water molecules, reducing the generated void volumes and promoting the OMIECs to undergo different phase transitions. Ultimately, the impact of these combined molecular processes is assessed in organic electrochemical transistors, revealing that careful balancing of these phenomena is required to maximize device performance.
Original languageEnglish (US)
Pages (from-to)2100723
JournalAdvanced Functional Materials
DOIs
StatePublished - Apr 17 2021

ASJC Scopus subject areas

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

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