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Cha, Dong Kyu
in Cooperation with on an Cooperation-Score of 37%
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Publications (4/4 displayed)
- 2014Thermoelectric properties of strontium titanate superlattices incorporating niobium oxide nanolayerscitations
- 2013Fabrication and characterization of high-mobility solution-based chalcogenide thin-film transistorscitations
- 2013High-performance ferroelectric memory based on phase-separated films of polymer blendscitations
- 2011Lattice dynamics and substrate-dependent transport properties of (In, Yb)-doped CoSb3 skutterudite thin filmscitations
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article
High-performance ferroelectric memory based on phase-separated films of polymer blends
Abstract
High-performance polymer memory is fabricated using blends of ferroelectric poly(vinylidene-fluoride-trifluoroethylene) (P(VDF-TrFE)) and highly insulating poly(p-phenylene oxide) (PPO). The blend films spontaneously phase separate into amorphous PPO nanospheres embedded in a semicrystalline P(VDF-TrFE) matrix. Using low molecular weight PPO with high miscibility in a common solvent, i.e., methyl ethyl ketone, blend films are spin cast with extremely low roughness (Rrms ≈ 4.92 nm) and achieve nanoscale phase seperation (PPO domain size < 200 nm). These blend devices display highly improved ferroelectric and dielectric performance with low dielectric losses (<0.2 up to 1 MHz), enhanced thermal stability (up to ≈353 K), excellent fatigue endurance (80% retention after 106 cycles at 1 KHz) and high dielectric breakdown fields (≈360 MV/m). © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.