scholarly journals Giant spontaneous polarization for enhanced ferroelectric properties of biaxially oriented poly(vinylidene fluoride) by mobile oriented amorphous fractions

2021 ◽  
Author(s):  
Guanchun Rui ◽  
Yanfei Huang ◽  
Xinyue Chen ◽  
Ruipeng Li ◽  
Dingrui Wang ◽  
...  
Keyword(s):  
Spontaneous Polarization ◽  
Vinylidene Fluoride ◽  
Ferroelectric Properties ◽  
Amorphous Fraction ◽  
Poly Vinylidene Fluoride

Oriented amorphous fraction in biaxially oriented poly(vinylidene fluoride) gives it significantly enhanced dielectric and ferroelectric properties.

Effect of Interface and Crystallinity on the Ferroelectric Properties of Poly(Vinylidene Fluoride-Trifluoroethylene) Copolymer Thin Films

2001 ◽  
Vol 665 ◽  
Author(s):  
Feng Xia ◽  
H.S. Xu ◽  
Babak Razavi ◽  
Q. M. Zhang
Keyword(s):  
Thin Films ◽  
Vinylidene Fluoride ◽  
Ferroelectric Properties ◽  
Large Change ◽  
Thickness Dependence ◽  
Dielectric Measurement ◽  
Switching Speed ◽  
Wide Range ◽  
Poly Vinylidene Fluoride ◽  
Polarization Level

ABSTRACTFerroelectric polymer thin films are attractive for a wide range of applications such as MEMS, IR sensors, and memory devices. We present the results of a recent investigation on the thickness dependence of the ferroelectric properties of poly(vinylidene fluoridetrifluoroethylene) copolymer spin cast films on electroded Si substrate. We show that as the film thickness is reduced, there exist two thickness regions. For films at thickness above 100 nm, the thickness dependence of the ferroelectric properties can be attributed to the interface effect. However, for thinner films, there is a large change in the ferroelectric properties such as the polarization level, the coercive field, and polarization switching speed, which is related to the large drop of the crystallinity in the ultrathin film region (below 100 nm). The results from Xray, dielectric measurement, and AFM all indicate that there is a threshold thickness at about 100 nm below which the crystallinity in the film reduces abruptly.

Fabrication and Characterization of Ferroelectric Polymer/TiO2/Al-doped ZnO Structures

2008 ◽  
Vol 1071 ◽  
Author(s):  
Koji Aizawa
Keyword(s):  
Leakage Current ◽  
Vinylidene Fluoride ◽  
Ferroelectric Properties ◽  
Hysteresis Loops ◽  
Tio2 Films ◽  
Gate Leakage Current ◽  
Poly Vinylidene Fluoride ◽  
Doped Zno ◽  
Fabrication And Characterization

AbstractCharacterization of 700-nm-thick poly(vinylidene fluoride/trifluoroethylene) [P(VDF/TrFE)]/TiO2/Al-doped ZnO (AZO) structures on a glass substrate were investigated. In this study, the sputtered TiO2 films as insulator were used for the reduction of leakage current. The leakage current density of the fabricated Pt/P(VDF/TrFE)/AZO and Pt/P(VDF/TrFE)/170-nm-thick TiO2/AZO structures were approximately 8.7 and 3.9 nA/cm2 at the applied voltage of 10 V, respectively. In the polarization vs. voltage characteristics, the fabricated Pt/P(VDF/TrFE)/TiO2/AZO structures showed hysteresis loops caused by ferroelectric polarization. The remnant polarization (2Pr) and coercive voltage (2Vc) measured from a saturated hysteresis loop at the frequency of 50 Hz were approximately 12 μC/cm2 and 105 V, respectively. These results suggest that the insertion of TiO2 film is available for reducing the gate leakage current without changing the ferroelectric properties.

Crystal Structure and Ferroelectric Properties of Poly(vinylidene fluoride)-Carbon nano tube Nanocomposite Film

2008 ◽  
Vol 491 (1) ◽  
pp. 247-254 ◽  
Author(s):  
Ji Seok Lee ◽  
Gwang Ho Kim ◽  
Woo Nyon Kim ◽  
Kyung Hwan Oh ◽  
Hyeong Tae Kim ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Nanocomposite Film ◽  
Vinylidene Fluoride ◽  
Ferroelectric Properties ◽  
Poly Vinylidene Fluoride ◽  
Carbon Nano Tube
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