Controlling electrochemically induced volume changes in conjugated polymers by chemical design: from theory to devices

by M. Moser, J. Gladisch, S. Ghosh, T.C. Hidalgo, (…), S. Inal, M. Berggren, I. Zozoulenko, E. Stavrinidou, I. McCulloch
Year:2021 DOI: 10.1002/adfm.202100723

Bibliography

Controlling electrochemically induced volume changes in conjugated polymers by chemical design: from theory to devices
M. Moser, J. Gladisch, S. Ghosh, T.C. Hidalgo, J.F. Ponder Jr., (…), S. Inal, M. Berggren, I. Zozoulenko, E. Stavrinidou, I. McCulloch
Advanced Functional Materials, 2100723, 2, 2021

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.

Keywords

Bioelectronics Electrochemical swelling MD simulations Organic electrochemical transistors Organic mixed ionic-electronic conductors
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