Properties of thin ferroelectric polymer films

Limbong, Albinur; Guy, I. L.; Zheng, Z.; Afifuddin,; Tansley, T.L.

doi:10.1080/00150199908214899

Cited by 15 publications

(7 citation statements)

References 5 publications

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“…3,[12][13][14][15] Therefore, how to increase the polarization level and reduce the switching field/voltage becomes crucial for practical application of ferroelectric thin films. Moreover, a large drop in the polarization level was observed as the thickness was reduced to below 100 nm.…”

Section: B the Polarization Hysteresis Loopsmentioning

confidence: 99%

“…1 Early work on such memories was focused on ferroelectric perovskite oxide thin films which show two stable polarization states at zero bias. 3 The use of organic materials offers access to virtually unlimited memory area due to the possible multilayer structure as opposed to silicon-based memory technologies, where the area is restricted by the chip size, which is typically one centimeter square. 3 The use of organic materials offers access to virtually unlimited memory area due to the possible multilayer structure as opposed to silicon-based memory technologies, where the area is restricted by the chip size, which is typically one centimeter square.…”

Section: Introductionmentioning

confidence: 99%

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The preparation and ferroelectric properties of defect-free ultrathin films of vinylidene fluoride oligomer

Zhang

et al. 2010

Journal of Applied Physics

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Articles you may be interested inThe effect of electroactive interlayer on the ferroelectric properties in poly(vinylidene fluoride-trifluoroethylene) copolymer ultrathin filmsThe ultrathin, defect-free ferroelectric films of vinylidene fluoride oligomer were fabricated by vapor deposition. A narrow substrate temperature window was found to get high quality ferroelectric films. Ferroelectric phase was obtained when the substrate temperature was −90°C. The ferroelectric phase is stable at room temperature, even after annealing at 120°C for 30 min. A full memory stack based on the ferroelectric VDF oligomer may work as nonvolatile random access memory with superhigh density due to the smaller crystal grain comparing with that of poly͑vinylidene fluoride-trifluoethylene͒ ͓P͑VDF-TrFE͔͒ copolymers. The cell shows prominent ferroelectric properties even as the thickness of VDF oligomer film is down to 60 nm with a coercive field of 95 MV/m and a remnant polarization of 125 mC/ m 2 . After 1 ϫ 10 5 cycles of switching, no ferroelectric degradation was observed, the ratio of polarization before and after fatigue is close to 1, which is in contrast to P͑VDF-TrFE͒ thin film where the ferroelectric degradation starts after 1 ϫ 10 4 times of switching. The pulse polarization test shows that switching takes place as fast as a few microseconds to reach 90% of the saturated polarization. At 60°C and 8 V operating voltage, the cell still shows excellent fatigue property.

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Section: B the Polarization Hysteresis Loopsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The preparation and ferroelectric properties of defect-free ultrathin films of vinylidene fluoride oligomer

Zhang

et al. 2010

Journal of Applied Physics

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“…The degradation of the polarization for P(VDF-TrFE) copolymer films is believed to be related with the pinning of electric dipoles to the electrodes and defect structures such as vacancies and pores. 22,23 For the BaTiO 3 /P(VDF-TrFE) composite film, BaTiO 3 powders act as defects and cause pinning of electric dipoles. Furthermore, reduction of crystallite/amorphous interfaces on cyclic electric loading also leads to polarization degradation on cyclic electric field.…”

Section: Discussionmentioning

confidence: 99%

Electric fatigue of ceramic–polymer composite film under cyclic electric field

Fang

Yang

Zhang

et al. 2008

J of Applied Polymer Sci

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Electric fatigue under cyclic electric loading was characterized for 0-3 composite film with particles of barium titanate dispersed in poly(vinylidene fluoride-trifluoroethylene) copolymer matrix. The data reveal that both remanant polarization and coercive field decrease as the cycle number increases. Scanning electron microscope observation and X-ray diffraction analysis were carried out to examine the morphology and microstructure change during the electric field cycling. On cyclic electric field, large quantities of flaw-like defects occur and the crystallites grow in size, leading to reduction of interfacial layers between the crystalline and amorphous regions. The relationship between the microstructure evolution and the polarization behavior is discussed.

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“…The electric fatigue originates from the pinning of the polarization charges to the electrodes, delamination between the electrode and films, the defects of structures such as pores and inclusions, etc. [17][18][19][20][21] Efforts were made to find feasible solutions to achieve fatigue-resistance or fatigue-free ferroelectrics. [21][22][23][24] Fang et al 21 firstly reported a polarization enhancement for P(VDF-TrFE) copolymer films by a tailored electric cycling process.…”

Section: Introductionmentioning

confidence: 99%

Strengthening of electromechanical properties for poly(vinylidene fluoride‐trifluoroethylene) films under tailored electric cycling

Jing

Fang

Yang

2017

J of Applied Polymer Sci

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Copolymers of polyvinylidene fluoride and trifluorethylene [P(VDF‐TrFE)] have potential applications in wearable and implantable electromechanical devices since they are mechanically flexible, and biocompatible. A tailored electric cyclic process is employed to enhance both electrical and mechanical properties in P(VDF‐TrFE) 65/35 mol % copolymer films. The films are subjected to lower and higher field magnitude electric cycling successively. For electrical properties, enhancement in remnant polarization, dielectric and piezoelectric constants occurs. From mechanical point of view, strengthening in the fracture strength happens. Wide‐angle X‐ray diffraction techniques examine changes of the orientation of the molecular chains, grain size, and crystallinity after electric cycling for the copolymer films. Scanning electron microscopy reveals evolutions of the microstructure, including rod‐like textures and fractography of the films. The results indicate that electric cycling causes the molecular chains to orient gradually along the direction perpendicular to the applied electric field. Consequently, an enhancement of 12.2% and 45% is realized for the remnant polarization and fracture strength, respectively for P(VDF‐TrFE) 65/35 copolymer film. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45926.

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Properties of thin ferroelectric polymer films

Cited by 15 publications

References 5 publications

The preparation and ferroelectric properties of defect-free ultrathin films of vinylidene fluoride oligomer

The preparation and ferroelectric properties of defect-free ultrathin films of vinylidene fluoride oligomer

Electric fatigue of ceramic–polymer composite film under cyclic electric field

Strengthening of electromechanical properties for poly(vinylidene fluoride‐trifluoroethylene) films under tailored electric cycling

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