Dissipative charge transport in organic mixed ionic-electronic conductor channels.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40082401.
- Also identified by DOI 10.1038/s41467-025-57528-9 and PMC identifier 11906743.
- Licence recorded as CC BY-NC-ND.
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Abstract
Understanding charge transport in organic mixed ionic-electronic conductors (OMIECs) is crucial to improve the performances of bioelectronic and neuromorphic devices. Recent studies reveal that the amplification of electrical signals in organic electrochemical transistors is determined by the volumetric capacitance c<sub>v</sub> and electronic mobility μ<sub>e</sub> of OMIEC channels, but how material parameters impact on the signal propagation speed and energy dissipation remains unclear. To address this issue, we combine electrical measurements of the phase velocity in microstructured OMIEC channels with local measurements of ionic displacements with modulated electrochemical atomic force microscopy. We interpret experimental data with a simplified transmission line model to determine the dispersion relation for OMIEC channels. We demonstrate that at relevant frequencies the phase velocity is dominated by the ratio of μ<sub>el</sub>/c<sub>v</sub>, constituting an additional figure of merit to benchmark material formulations. These results highlight intrinsic limitations of OMIEC-based circuits and compare their efficiency with neuronal signal transmission.