Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.052
Publication date: 23rd September 2021
Electrochemical doping of organic conjugated polymers can be investigated in OECTs (Organic Electrochemical Transistors), which are sensitive sensors used for example in biological applications. They can be described using two circuits: an ionic circuit and an electronic circuit. The former arises from ions penetrating an organic channel due to switching of the gate, while the latter arises form source-drain electron flow across the organic channel. In the last years, advancing our knowledge of OECTs has allowed a drastic increase of their performance, however a complete picture of the two circuits and how they interact is still lacking. Here, we will introduce two new spectroscopic techniques to study the ionic and electronic transport processes in OECTs: 1) Time-resolved spectro-electrochemistry measures the kinetics of the ionic circuit. This measurement monitors the ion penetration into the organic channel and the doping processes with millisecond temporal resolution. 2) In-situ THz absorption spectroscopy, which investigates the electronic circuit and transport at different doping levels. It probes the nature of the electronic charges and the nanoscale conductivity of the organic channel. Results on PEDOT:PSS based OECTs and sandwish electrochemical devices will be presented. A deep understanding of the internal mechanisms occurring in OECTs is an essential step towards further interfacing with elaborate biological systems.
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