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Suppressing depolarization by tail substitution in an organic supramolecular ferroelectric
Linkoping Univ, Complex Mat & Devices, Dept Phys Chem & Biol IFM, S-58183 Linkoping, Sweden..
Eindhoven Univ Technol, Lab Macromol & Organ Chem, POB 513, NL-5600 MB Eindhoven, Netherlands..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Theoretical Chemistry and Biology.
Eindhoven Univ Technol, Lab Macromol & Organ Chem, POB 513, NL-5600 MB Eindhoven, 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
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Physical Chemistry
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URN: urn:nbn:se:kth:diva-246286DOI: 10.1039/c8cp06315jISI: 000459584100039PubMedID: 30638230Scopus ID: 2-s2.0-85060382616OAI: oai:DiVA.org:kth-246286DiVA, id: diva2:1298944
Note

QC 20190325

Available from: 2019-03-25 Created: 2019-03-25 Last updated: 2019-03-25Bibliographically approved

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Biler, MichalNorman, PatrickLinares, MathieuKemerink, Martijn
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