Emergence of ambient temperature ferroelectricity in meso-tetrakis(1- methylpyridinium-4-yl)porphyrin chloride thin films

Vasilopoulou, Maria, Dimitrakis, Panagiotis, Georgiadou, Dimitra G., Velessiotis, Dimitrios, Papadimitropoulos, Georgios, Davazoglou, Dimitris, Coutsolelos, Athanassios G. and Argitis, Panagiotis (2013) Emergence of ambient temperature ferroelectricity in meso-tetrakis(1- methylpyridinium-4-yl)porphyrin chloride thin films. Applied Physics Letters, 103 (2), 1-6, [022908]. (doi:10.1063/1.4813009).

Abstract

Here, we demonstrate that the meso-tetrakis(1-methylpyridinium-4-yl) porphyrin chloride, [H₂TMPyP]⁴⁺Cl₄, with a face-to-face orientation directed along a single direction displays ferroelectric properties at room temperature. This is attributed to its spontaneous polarization, due to an extensive hydrogen-bonded network. From C-V measurements, a remnant polarization of approximately 0.5 μC cm^-2 was estimated for pristine porphyrin film, which increases linearly up to about 1.7 μC cm^-2 after applying 2 V at the top electrode and further to 9.6 μC cm^-2 after 5 V positive poling. This large - for practical utilization - level of remnant polarization of [H₂TMPyP] ⁴⁺Cl₄ makes it promising for future applications.

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Contributors

Author: Dimitra G. Georgiadou

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