Operando Studies of Organic Mixed Ionic-Electronic Conductors and Their Implications for Materials Design
Jonathan Rivnay a
a Department of Biomedical Engineering, Northwestern University, 2145 Sheridan Road, Evanston, United States
Materials for Sustainable Development Conference (MATSUS)
Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
#OMIECs - Fundamentals of mixed ionic-electronic transport in polymers
Torremolinos, Spain, 2023 October 16th - 20th
Organizer: Simone Fabiano
Invited Speaker, Jonathan Rivnay, presentation 113
DOI: https://doi.org/10.29363/nanoge.matsus.2023.113
Publication date: 18th July 2023

Organic mixed ionic/electronic conductors (OMIECs) have gained considerable interest in bioelectronics, power electronics, circuits and neuromorphic computing. These organic, often polymer-based, semiconductors rely on a combination of ionic transport, electronic transport, and high volumetric charge storage capacity. Despite recent progress and a rapidly expanding library of new materials, a full understanding of fundamental processes of OMIECs remains largely unexplored. Critically, useful studies require us to probe these systems in device-relevant conditions, fully considering the effects of ions and solvent on microstructure and transport. To this end, we report on recent efforts towards structure/composition-property relations in high performance organic mixed conductors using ex-situ, in-situ, and operando scattering and spectroscopic techniques. We use a combination of GIWAXS, GISAXS, XPCS, E-QCMd, UV-Vis, XRF, as well as device measurements to explore kinetics, composition, and structural evolution during electrochemical operation. Importantly, these findings provide insights into materials design for enhancing device performance and stability.

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