The Effect of Electric Aging on Vinylidene Fluoride Copolymers for Ferroelectric Memory

Copolymers based on vinylidene fluoride are potential materials for ferroelectric memory elements. The trend in studies showing that a decrease in the degree of crystallinity can lead to an unexpected increase in the electric breakdown field is noted. An analysis of the literature data reveals that...

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Published in:	Nanomaterials (Basel, Switzerland) Vol. 14; no. 12; p. 1002
Main Authors:	Kochervinskii, Valentin V, Buryanskaya, Evgeniya L, Osipkov, Aleksey S, Makeev, Mstislav O, Kiselev, Dmitry A, Gradova, Margarita A, Gradov, Oleg V, Lokshin, Boris V, Korlyukov, Alexandr A
Format:	Journal Article
Language:	English
Published:	Switzerland MDPI AG 09-06-2024 MDPI
Subjects:	Breakdown Coercivity Composition Copolymers Crystallization Degree of crystallinity Dichloroethylene Electric fields Electrical properties Ferroelectric crystals Ferroelectric materials Ferroelectricity Ferroelectrics flexible electronics Fluorides Fluorine Hysteresis loops Infrared spectroscopy nanoelectronics polarization Polymer films Polymers sensing technology Spectrum analysis Temperature Tetrafluoroethylene Vinylidene Vinylidene fluoride X-ray diffraction Russia microstructure sensing technology flexible electronics ferroelectric materials nanoelectronics polarization polymers
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Summary:	Copolymers based on vinylidene fluoride are potential materials for ferroelectric memory elements. The trend in studies showing that a decrease in the degree of crystallinity can lead to an unexpected increase in the electric breakdown field is noted. An analysis of the literature data reveals that in fluorine-containing ferroelectric polymers, when using a bipolar triangular field, the hysteresis loop has an unclosed shape, with each subsequent loop being accompanied by a decrease in the dielectric response. In this work, the effect of the structure of self-polarized films of copolymers of vinylidene fluoride with tetrafluoroethylene and hexafluoropropylene on breakdown processes was studied. The structure of the polymer films was monitored using infrared spectroscopy (IR) and X-ray diffraction. Kelvin probe force microscopy (KPFM) was applied to characterize the local electrical properties of the polymers. For the films of the first copolymer, which crystallize in the polar β-phase, asymmetry in the dielectric response was observed at fields greater than the coercive field. For the films of the copolymers of vinylidene fluoride with hexafluoropropylene, which crystallize predominantly in the nonpolar α-phase, polarization switching processes have also been observed, but at lower electric fields. The noted phenomena will help to identify the influence of the structure of ferroelectric polymers on their electrical properties.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	2079-4991 2079-4991
DOI:	10.3390/nano14121002