SKM 2023 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 19: Organic Electronics and Photovoltaics I (joint session CPP/HL)

HL 19.5: Vortrag

Dienstag, 28. März 2023, 10:30–10:45, GÖR 226

In search of novel organic ferroelectrics — •Heiko Mager¹, Shyamkumar Haridas², Max von Delius², and Martijn Kemerink¹ — ¹Institute for Molecular Systems Engineering and Advanced Materials, Heidelberg University — ²Institute of Organic Chemistry, University of Ulm

The switchable polarization and concomitant pyroelectric and piezoelectric properties of ferroelectric materials enable a variety of applications, ranging from memory devices over thermal and mechanical sensors to energy harvesters. Although current applications are dominated by inorganic materials, organic ferroelectrics offer a flexible, cheap and possibly non-toxic and biodegradable alternative.

Here, we present experimental research on the ferroelectric-like behavior of the novel liquid crystalline molecule C6H6F5O-C3-Amide and its molecular derivatives. To screen for a possible para- to ferroelectric phase transitions, dielectric spectroscopy was employed. While the for ferroelectric materials characteristic Curie-Weiß behavior was not directly observed, features in the dielectric suggest a possible phase transition coinciding with a peak in differential scanning calorimetry traces.
Polarization hysteresis loops were obtained via double wave measurements and characteristic capacitance- voltage "butterfly" loops measured. Comparisons between the different molecular derivatives allow insights into the molecular groups relevant for the switching process.