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Suppressing depolarization by tail substitution in an organic supramolecular ferroelectric
Linköping University, Department of Physics, Chemistry and Biology, Complex Materials and Devices. Linköping University, Faculty of Science & Engineering.
Eindhoven Univ Technol, Netherlands.
KTH Royal Inst Technol, Sweden.
Eindhoven Univ Technol, Netherlands.
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2019 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 21, no 4, p. 2069-2079Article in journal (Refereed) Published
Abstract [en]

Despite being very well established in the field of electro-optics, ferroelectric liquid crystals so far lacked interest from a ferroelectric device perspective due to a typically high operating temperature, a modest remnant polarization and/or poor polarization retention. Here, we experimentally demonstrate how simple structural modification of a prototypical ferroelectric liquid-crystal benzene-1,3,5-trisamide (BTA) - introduction of branched-tail substituents - results in materials with a wide operating temperature range and a data retention time of more than 10 years in thin-film solution-processed capacitor devices at room temperature. The observed differences between linear- and branched-tail compounds are analyzed using density functional theory (DFT) and molecular dynamics (MD) simulations. We conclude that morphological factors like improved packing quality and reduced disorder, rather than electrostatic interactions or intra/inter-columnar steric hindrance, underlay the superior properties of the branched-tailed BTAs. Synergistic effects upon blending of compounds with branched and linear side-chains can be used to further improve the materials characteristics.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY , 2019. Vol. 21, no 4, p. 2069-2079
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-155600DOI: 10.1039/c8cp06315jISI: 000459584100039PubMedID: 30638230OAI: oai:DiVA.org:liu-155600DiVA, id: diva2:1297807
Note

Funding Agencies|Vetenskapsradet; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University [2009 00971]; SeRC (Swedish e-Science Research Center)

Available from: 2019-03-21 Created: 2019-03-21 Last updated: 2019-03-21

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