Polarization enhancement for poly(vinylidene fluoride-trifluoroethylene) 75∕25 copolymer films by interlayer ordering under cyclic electric field

Fang, Fei; Yang, Wei; Jia, Cheng; Luo, Xi

doi:10.1063/1.2939556

Cited by 29 publications

(40 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The polarization enhancement has been observed previously, where it was reported that it might be due to field-induced recrystallization16. We note that a similar enhancement can be found, upon close inspection, in other reported data sets, both for organic1718 and inorganic ferroelectrics2. In all our measurements there is an apparent correlation between the polarization enhancement and the onset of degradation.…”

Section: Resultssupporting

confidence: 91%

Polarization fatigue of organic ferroelectric capacitors

Zhao

Katsouras

et al. 2014

Sci Rep

View full text Add to dashboard Cite

The polarization of the ferroelectric polymer P(VDF-TrFE) decreases upon prolonged cycling. Understanding of this fatigue behavior is of great technological importance for the implementation of P(VDF-TrFE) in random-access memories. However, the origin of fatigue is still ambiguous. Here we investigate fatigue in thin-film capacitors by systematically varying the frequency and amplitude of the driving waveform. We show that the fatigue is due to delamination of the top electrode. The origin is accumulation of gases, expelled from the capacitor, under the impermeable top electrode. The gases are formed by electron-induced phase decomposition of P(VDF-TrFE), similar as reported for inorganic ferroelectric materials. When the gas barrier is removed and the waveform is adapted, a fatigue-free ferroelectric capacitor based on P(VDF-TrFE) is realized. The capacitor can be cycled for more than 108 times, approaching the programming cycle endurance of its inorganic ferroelectric counterparts.

show abstract

Section: Resultssupporting

confidence: 91%

Polarization fatigue of organic ferroelectric capacitors

Zhao

Katsouras

et al. 2014

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Similar to that reported in Ref. for P(VDF‐TrEF) 75/25, copolymer of P(VDF‐TrFE) 65/35 also shows the polarization enhancement under the tailored electric cycling. When electric cycling at a lower field magnitude of 70 MV/m, there are hardly any changes for P r , P s , and E c after electric cycling for 30,000 cycles.…”

Section: Resultssupporting

confidence: 88%

“…When electric cycling at a lower field magnitude of 70 MV/m, there are hardly any changes for P r , P s , and E c after electric cycling for 30,000 cycles. The value of the lower filed magnitude is chosen to be over the coercive field and the obtained polarization loop is comparatively slim . Therefore, upon the electric field cycling, there is an increase for the dipole or molecular chain ordering, while the electric cycling would not cause much damage to the film samples …”

Section: Resultsmentioning

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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…Poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] copolymer is one of the promising materials to fulfill both properties at once [7,8]. There have been many reports on the memory characteristics of P(VDF-TrFE) with metal-ferroelectric-metal (MFM) [9][10][11], metal-ferroelectric-insulator-semiconductor (MFIS) capacitors, or OFETs [12][13][14][15][16][17][18]. Although these results clearly suggest a high feasibility of P(VDF-TrFE) for nonvolatile memory, there are a few challenges must be addressed such as a high programming voltage, low switching speed, and insufficient data retention time and various approaches including modifications of material and/or device structure have been proposed [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%