Gorbunov A V, Meng X, Urbanaviciute I, Putzeys T, Wübbenhorst M, Sijbesma R P, Kemerink M
Department of Applied Physics, Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven, The Netherlands.
Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.
Phys Chem Chem Phys. 2017 Jan 25;19(4):3192-3200. doi: 10.1039/c6cp08015d.
We investigate the polarization loss in the archetypical molecular organic ferroelectric trialkylbenzene-1,3,5-tricarboxamide (BTA). We prove that the polarization loss is due to thermally activated R-relaxation, which is a collective reversal of the amide dipole moments in ferroelectric domains. By applying a weak electrostatic field both the polarization loss and the R-relaxation are suppressed, leading to an enhancement of the retention time by at least several orders of magnitude. Alternative loss mechanisms are discussed and ruled out. By operating the thin-film devices slightly above the crystalline to liquid crystalline phase transition temperature the retention time of one compound becomes more than 12 hours even in absence of supportive bias, which is among the longest reported so far for organic ferroelectric materials.
我们研究了典型分子有机铁电体三烷基苯-1,3,5-三甲酰胺（BTA）中的极化损耗。我们证明极化损耗是由于热激活的R弛豫，这是铁电畴中酰胺偶极矩的集体反转。通过施加弱静电场，极化损耗和R弛豫均受到抑制，使得保持时间至少提高了几个数量级。我们讨论并排除了其他损耗机制。通过在略高于晶体到液晶相变温度的条件下操作薄膜器件，即使在没有支持偏压的情况下，一种化合物的保持时间也超过了12小时，这是迄今为止报道的有机铁电材料中最长的之一。
