Journal
NATURE MATERIALS
Volume 19, Issue 1, Pages 13-26Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41563-019-0435-z
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Funding
- National Science Foundation [NSF DMR-1751308]
- Swedish Government Strategic Research Area in Materials Science on Advanced Functional Materials at Linkoping University (faculty grant SFO-Mat-LiU) [2009-00971]
- Swedish Foundation for Strategic Research
- Vetenskapsradet [VR-2017-04910]
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Materials that efficiently transport and couple ionic and electronic charge are key to advancing a host of technological developments for next-generation bioelectronic, optoelectronic and energy storage devices. Here we highlight key progress in the design and study of organic mixed ionic-electronic conductors (OMIECs), a diverse family of soft synthetically tunable mixed conductors. Across applications, the same interrelated fundamental physical processes dictate OMIEC properties and determine device performance. Owing to ionic and electronic interactions and coupled transport properties, OMIECs demand special understanding beyond knowledge derived from the study of organic thin films and membranes meant to support either electronic or ionic processes only. We address seemingly conflicting views and terminology regarding charging processes in these materials, and highlight recent approaches that extend fundamental understanding and contribute to the advancement of materials. Further progress is predicated on multimodal and multi-scale approaches to overcome lingering barriers to OMIEC design and implementation.
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