Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.182
Publication date: 18th July 2023
The presentation will give an overview over recent studies in my group about design and processing of polymeric mixed-ionic-electronic conductors for opto-electronic and switchable technologies including actuators, electrochromic displays and electrically switchable metasurfaces.
In the first part, electrochemistry will be shown as versatile tool to control the doping level of semiconducting polymer films. Data on tunable absorption properties, electrical conductivities and wetting behavior will be presented for p-type materials.[1] Both, in-situ as well as ex-situ electrochemical techniques will be presented and correlations to the morphology of the films will be drawn. For energy level determination within fully organic solar cells particularly in-situ spectroelectrochemistry of blend films proved to be highly useful.[2]
In the second part, poly(ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) will be presented as multifunctional material. Electrochemical switching in organic and in aqueous electrolytes results in different degrees of volume swelling as characterized by in-situ spectroscopic ellipsometry.[3] The humidity dependence of the PSS polyelectrolyte phase further allows to prepare volume changes by water uptake. The bending behavior of “intelligent” humidity-triggered bilayer actuators with poly(dimethylsiloxane) (PDMS) passive layers can be explained by the humidity-dependent mechanical behavior of PEDOT:PSS.[4]
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