Self-assembly of organic ferroelectrics by evaporative dewetting: a case of β-glycine

Seyedhosseini, E. et al. (2017) Self-assembly of organic ferroelectrics by evaporative dewetting: a case of β-glycine. ACS Applied Materials and Interfaces, 9(23), pp. 20029-20037. (doi:10.1021/acsami.7b02952) (PMID:28534399)

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Self-assembly of ferroelectric materials attracts significant interest because it offers a promising fabrication route to novel structures useful for microelectronic devices such as nonvolatile memories, integrated sensors/actuators, or energy harvesters. In this work, we demonstrate a novel approach for self-assembly of organic ferroelectrics (as exemplified by ferroelectric β-glycine) using evaporative dewetting, which allows forming quasi-regular arrays of nano- and microislands with preferred orientation of polarization axes. Surprisingly, self-assembled islands are crystallographically oriented in a radial direction from the center of organic “grains” formed during dewetting process. The kinetics of dewetting process follows the t–1/2 law, which is responsible for the observed polygon shape of the grain boundaries and island coverage as a function of radial position. The polarization in ferroelectric islands of β-glycine is parallel to the substrate and switchable under a relatively small dc voltage applied by the conducting tip of piezoresponse force microscope. Significant size effect on polarization is observed and explained within the Landau–Ginzburg–Devonshire phenomenological formalism.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Seyed Hosseini, Dr Ensieh
Authors: Seyedhosseini, E., Romanyuk, K., Vasileva, D., Vasilev, S., Nuraeva, A., Zelenovskiy, P., Ivanov, M., Morozovska, A. N., Shur, V. Y., Lu, H., Gruverman, A., and Kholkin, A. L.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:ACS Applied Materials and Interfaces
Publisher:American Chemical Society
ISSN (Online):1944-8252
Published Online:23 May 2017

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