Dresden 2026 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 17: Poster I

CPP 17.7: Poster

Montag, 9. März 2026, 19:00–21:00, P5

Long Chain, Strong Gain: How SubPC side chains control the pseudoferroelectric bulk photovoltaic effect — •Kaspar Haas¹, Sophia Klubertz¹, Victor Rodriguez², David González-Rodríguez³, Miguel García Iglesias², and Martijn Kemerink¹ — ¹Universität Heidelberg, Heidelberg — ²Universidad de Cantabria, Santander — ³Universidad Autónoma de Madrid, Madrid

While most studies of the bulk photovoltaic effect (BPE) in recent years have focused on inorganic materials, this fascinating effect should also be observable in organics. In contrast to the conventional photovoltaic effect, the BPE voids the need for doping by utilizing an intrinsic symmetry breaking and could allow for wider absorption spectra while theoretically overcoming the Shockley-Queisser limit. Going organic holds the additional promise of lightweight, low-fabrication- and low-energy-cost devices, and, particularly, of a much greater tunability of the active material.

Here, we investigate organic molecules of the semiconducting π-conjugated SubPC-F family with the purpose of finding and quantifying a bulk photovoltaic effect. Combining electrical measurements with polarization optical microscopy (POM), XRD and AFM, we investigate the dipole alignment in these liquid crystalline materials, before assessing their photovoltaic performance under irradiation. We further build our own liquid crystal cells for measuring in out-of-plane structures to draw a connection between device thickness and performance. We also aim to quantify the influence of different side chain lengths on material properties like open-circuit voltage and photocurrent.

Keywords: bulk photovoltaic effect; ferroelectric; liquid crystal; organic electronic