Tunable electroresistance and electro-optic effects of transparent molecular ferroelectrics
Subject0912 Materials Engineering
Permanent link to this recordhttp://hdl.handle.net/20.500.12613/5121
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AbstractCopyright © 2017 The Authors, some rights reserved. Recent progress in molecular ferroelectrics (MOFEs) has been overshadowed by the lack of high-quality thin films for device integration. We report a water-based air-processable technique to prepare large-area MOFE thin films, controlled by supersaturation growth at the liquid-air interface under a temperature gradient and external water partial pressure. We used this technique to fabricate ImClO4 thin films and found a large, tunable room temperature electroresistance: a 20-fold resistance variation upon polarization switching. The as-grown films are transparent and consist of a bamboo-like structure of (2, 1-, 0) and (1, 0, 2-) structural variants of R3m symmetry with a reversible polarization of 6.7 μC/cm2. The resulting ferroelectric domain structure leads to a reversible electromechanical response of d33 = 38.8 pm/V. Polarization switching results in a change of the refractive index, n, of single domains, Δn/n = 0.3. The remarkable combination of these characteristics renders MOFEs a prime candidate material for new nanoelectronic devices. The information that we present in this work will open a new area of MOFE thin-film technologies.
Citation to related workAmerican Association for the Advancement of Science (AAAS)
Has partScience Advances
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