Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 71: Poster Plasmonics and Nanooptics: Fabrication, Characterization and Applications
O 71.5: Poster
Mittwoch, 19. März 2025, 18:00–20:00, P2
Investigating Gel Electrolyte Compositions for Enhanced Switching Speed in PEDOT:PSS Electrochromic Devices and Switchable Metasurfaces — •Hoorieh Fallah1, Dominik Ludescher1, Jonas Herbig1, Mario Hentschel1, Andy Steinmann1, Klaus Dirnberger2, Junqi Lu2, Semi Kim2, Aldilene Santos Franca2, Sabine Ludwigs2, and Harald Giessen1 — 14th Physics Institute and Research Center SCoPE, University of Stuttgart — 2Institute of Polymer Chemistry, University of Stuttgart
Switchable metasurfaces using the conductive polymer PEDOT:PSS have gained substantial interest over the last years. PEDOT:PSS can be switched from metallic to dielectric state for wavelengths > 1.3 µm using electrochemistry, with CMOS compatible voltages between -1V to +1V. Here, we report on the preparation and characterization of gel electrolytes for PEDOT switching with varying ratios based on polyethylene oxide (PEO), polyvinyl alcohol polymers (PVA), acetonitrile, and lithium perchlorate (LiClO4). Our gel electrolytes are integrated with PEDOT:PSS, coated onto ITO substrates to evaluate their performance in electrochromic switching applications. By applying alternating voltage and laser light, we analyze the dynamic switching speed of the PEDOT layer as it transitions from a conductive to an insulating state. Our approach explores how PEO- and PVA-based electrolytes impact high-frequency, low-voltage switching in PEDOT:PSS systems. We have achieved switching rates up to 100 Hz. The results aim to enhance our understanding of the influence of the electrolyte composition on switching behavior.
Keywords: Switchable metasurfaces; Electrochromic material; Gel electrolyte; Metal-to-insulator transition