Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 31: Organic Electronics and Photovoltaics II
CPP 31.5: Vortrag
Mittwoch, 20. März 2024, 16:00–16:15, H 0110
A novel organic ferroelectric with two parallel sublattices? — •Ramon Jannasch1, Maximilian Litterst1, Manjunath Balagopalan2, Elin Dypvik Sødahl2, Ola Nilsen2, Carl Henrik Gørbitz2, Kristian Berland2, and Martijn Kemerink1 — 1IMSEAM, Heidelberg University, Heidelberg — 2Department of Chemistry, Norwegian University of Life Science, Oslo
Ferro- and piezoelectric materials find common usage in a range of electronic devices. Although inorganic materials so far dominate the field, they come with significant drawbacks, including energy-intensive production, reliance on toxic and/or rare elements and a lack of mechanical flexibility. Organic ferroelectric may offer a solution to some or even all of these problems.
Here, we investigate the organic material hexamethylenetetramine hydrogen DL-malate through various measurements aimed at assessing its ferroelectric behavior. Combining dielectric relaxation spectroscopy (DRS), capacitance-voltage (CV)-measurements and polarization hysteresis measurements using the double wave method (DWM), we obtain a comprehensive understanding of its ferroelectric properties. The observation of singularities in DRS, a butterfly loop in the CV-measurement, and a saturating switchable polarization during DWM collectively indicate bona fide ferroelectricity. At the same time, we find indications for the presence of two ferroelectric sublattices with different coercive fields but parallel alignment in the ground state.
Keywords: Organic ferroelectrics; ferroelectricity