Ferroelectric polymers are among the most promising materials for flexible electronic devices. Highly ordered arrays of the defect-modified ferroelectric polymer P(VDF-TrFE-CFE) (poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene)) are fabricated by nanoimprint lithography for nonvolatile memory application. The defective CFE units reduce the coercive field to one-fifth of that of ...

Ferroelectric polymer nanoparticles of poly(vinylidene fluoride) (PVDF) were prepared by dialysis nanoprecipitation. Particles with mean diameter 230 nm show piezoelectric response as observed Piezoresponse Force Microscopy (PFM). The origin this ferroelectric behavior has been attributed to the presence ferroelectrically active crystalline phases PVDF in (mainly ? and ? phases) demonstrated di...

– The electronic structure and band symmetries of the ferroelectric phase of poly (vinylidene fluoride) (PVDF) are studied by using the first-principles density-functional method. Our calculated results agree well with the angle-resolved photoemission experiments. We find that the PVDF crystal has an energy gap of about 6 eV at the Γ-point. Large dispersion of the valence band is found only alo...

Effect of proton irradiation on poly~vinylidene fluoride-trifluoroethylene! 56/44 mol % copolymer has been studied using a Mach–Zehnder heterodyne interferometer, polarization hysteresis loop and dielectric constant measurements. The electrical-field-induced strain response of the copolymer after proton bombardment follows a quadratic electrostriction relationship. The electrostrictive coeffici...

Piezoelectric films of poly(vinylidene fluoride) (PVDF) were prepared by casting and spin coating on silicon and glass substrates. The effect of the drying temperature and the post-annealing temperature on the film morphology was studied with optical microscopy. It was chosen the optimal combination of deposition conditions, regarding the wetting of the substrate surfaces, uniformity of the pro...

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A theoretical study of poly(vinylidene fluoride), PVDF, which exhibits piezoelectricity effect, is presented. By Density Functional Theory (DFT) calculations, some of the properties of this material have been obtained. Among those properties, hardness, capacitance, dipolar moment and energy associated to the structural changes. The B3LYP functional and 6311+G(d,p) bases set were used with a Gau...

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In this paper microsensing elements with thin piezoelectric films are presented. Three different materials from the basic types – ceramic, metal oxide and polymer, in microsystems for environment parameters control are used. Zinc oxide (ZnO) and lead zirconium titanate (PZT) by sputtering technology from hot targets are deposited. The optimal parameters of the process and thickness of the layer...

The paper reported the fabrication and operation of nonvolatile ferroelectric field effect transistors (FeFETs) with a top gate and top contact structure. Ultrathin Si nanomembranes without source and drain doping were used as the semiconducting layers whose electrical performance was modulated by the polarization of the ferroelectric poly(vinylidene fluoride trifluoroethylene) [P(VDF-TrFE)] th...