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Q: Fachverband Quantenoptik und Photonik

Q 8: Nanophotonics and Integrated Photonics II

Q 8.3: Vortrag

Montag, 2. März 2026, 17:45–18:00, P 3

Micro-structuring of electrically switchable PEDOT:PSS using one-photon polymerization — •Julian Bolsinger, Dominik Ludescher, Leander Siegle, Monika Ubl, and Harald Giessen — 4th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany

PEDOT:PSS is a conductive polymer with excellent electrical, optical, and mechanical properties used for transparent electrodes, biocompatible electronics, and sensor technology. Fabrication often requires precise structuring of a thin polymer film, typically achieved through inkjet printing, electron-beam lithography, or femtosecond direct laser writing. However, these methods are costly or offer limited resolution. We present two methods for structuring PEDOT:PSS based on one-photon polymerization using incoherent ultraviolet or coherent near-infrared light. In the first, a spin-coated PEDOT:PSS sample is exposed to ultraviolet light through a photomask, inducing cross-linking of polymer chains in the illuminated regions. Our method provides an inexpensive way for patterning large areas. For the second technique, a continuous-wave near-infrared laser beam is focused onto the polymer layer while the sample is translated, offering great flexibility and cost efficiency. We realize electrically switchable patterns with micrometer spatial resolution while keeping the polymer stable and conductive. In combination with 3D-printed micro-optics, PEDOT:PSS enables dynamic functionality. We are working towards integrating micro-optics with electrically switchable structures such as apertures and diffraction gratings.

Keywords: Conductive Polymer; PEDOT:PSS; One-Photon Polymerization; Electrically Switchable Microstructures; Direct Laser Writing