SKM 2023 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 2: Organic Semiconductors (joint session HL/CPP)
HL 2.3: Talk
Monday, March 27, 2023, 10:00–10:15, POT 251
Photovoltaic and nonlinear optical properties of complex self-assembled liquid crystal structures — •Ahmad Murad1, Alexey Eremin1, Martin Feneberg1, Maximilian Baumann2, Matthias Lehmann2, and Mohamed Alaasar3 — 1Otto-von-guericke-Universität, Magdeburg,Deutchland — 2Julius- Maximilians -Universität Würzburg — 3Martin Luther University Halle-Wittenberg, Halle (Saale),
We explore conducting and photovoltaic properties in a series of two classes of semiconducting liquid crystals. BTBT-derived polycatenary mesogens doped with fullerenes show helical network phases exhibiting a strong photovoltaic effect in a broad range of light spectrum from UV to VIS. The second class is star-shaped mesogens with subphthalocyanine core that forms self-assembled ferroelectric columnar phases. We characterise the polar order using polarisation-resolved measurements of Second Harmonic Generation (SHG). Dynamical SHG studies provide information about the switching rates and the stability of the ferroelectric states. The photovoltaic effect is demonstrated under UV exposure.