Dresden 2026 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 22: Hybrid, Organic and Perovskite Optoelectronics and Photovoltaics I
CPP 22.6: Talk
Tuesday, March 10, 2026, 11:00–11:15, ZEU/0260
Electrically switchable chiroptical responses in organic ferroelectric thin films — •Lorenz Friedrich Meier1, Sophia Klubertz1, Victor Rodriguez2, Miguel García-Iglesias2, David González-Rodríguez3, and Martijn Kemerink1 — 1Heidelberg University, Germany — 2Universidad de Cantabria, Spain — 3Universidad Autónoma de Madrid, Spain
Organic ferroelectrics potentially allow to introduce switchable polarization into an easily processable material, enabling their integration into next-generation electronic devices. We investigate a liquid-crystalline organic ferroelectric that additionally can exhibit electrically controlled chiroptical responses, relevant for optical data storage, photonic components, and chiroptical sensing. We investigate thin films of trialkylbenzene-1,3,5-tricarboxamide (BTA). These molecules self-assemble into supramolecular columns by forming a triple helix of dipoles connected via hydrogen bonds. By incorporating chirally-biased sidechains, the handedness of the supramolecular helix can be defined. We experimentally show ferroelectric behavior in both in-plane and out-of-plane geometries by double wave and CV measurements. We demonstrate how the unpractically high coercive fields for pure chiral BTA can be reduced by mixing with achiral BTA. Previous simulations show that the energetically preferred mechanism of polarization reversal of a supramolecular column will simultaneously change its chirality. Thus, an electrically switchable chirality is possible. We present an experimental investigation of this mechanism, discussing the challenges including the need for dipole pre-alignment.
Keywords: ferroelectrics; Organic ferroelectrics; chirality; chiroptical active