Polarization Switching Dynamics of Vinylidene Fluoride/Trifluoroethylene Copolymer Thin Films under High Electric Field at Various Temperatures

2013 ◽  
Vol 52 (4R) ◽  
pp. 041603 ◽  
Author(s):  
Hajime Ishii ◽  
Takashi Nakajima ◽  
Takeo Furukawa ◽  
Soichiro Okamura
Keyword(s):  
Thin Films ◽  
Electric Field ◽  
Vinylidene Fluoride ◽  
Polarization Switching ◽  
High Electric Field ◽  
Switching Dynamics

scholarly journals Thin films of vinylidene fluoride copolymer with tetrafluoroethylene: dynamics of ferroelectric polarization switching

2020 ◽  
Vol 21 (1) ◽  
pp. 43-51
Author(s):  
S. N. Fedosov ◽  
A. E. Sergeeva
Keyword(s):  
Thin Films ◽  
Space Charge ◽  
Polyvinylidene Fluoride ◽  
Vinylidene Fluoride ◽  
Polarization Switching ◽  
Ferroelectric Polarization ◽  
Relaxation Processes ◽  
Switching Dynamics ◽  
Additional Processing ◽  
Electrical Induction

The vinylidene fluoride copolymer with tetrafluoroethylene P(VDF-TFE) is a typical ferroelectric polymer that has not been sufficiently studied so far in comparison with pure polyvinylidene fluoride (PVDF) and its copolymer with trifluoroethylene. The purpose of this work was to reveal the features of forming ferroelectric polarization and its switching in thin films of P(VDF-TFE) under various conditions, such as the level of the applied electric field and the duration of its action within 8 orders of magnitude from 10 μs to 100 s. The sequence of voltage pulses applied during poling and polarization reversal allowed to reveal the characteristics of the polarization switching dynamics. To increase the resolution of the measurements, two complementary methods of recording electrical induction were used. The features of polarization and space charge relaxation over time have been studied by thermally stimulated depolarization method. A new phenomenon of gradual separation of the relaxation processes associated with polarization and space charge was observed. Both components were accompanied by trapped charges that compensated the depolarizing field. Several practical recommendations have been formulated regarding the desirable values of poling parameters and additional processing to increase the ferroelectric polarization stability.

Phase transitions of antiferroelectric lead zirconate thin films in high electric field

1996 ◽  
Vol 20 (5-6) ◽  
pp. 149-155 ◽  
Author(s):  
K. Yamakawa ◽  
K. W. A. Gachigi ◽  
S. Trolier-McKinstry ◽  
J. P. Dougherty
Keyword(s):  
Thin Films ◽  
Phase Transitions ◽  
Electric Field ◽  
Lead Zirconate ◽  
High Electric Field

Influence of Metal Electrodes on the Ferroelectric Responses of Poly(vinylidene fluoride-trifluoroethylene) Copolymer Thin Films

2002 ◽  
Vol 734 ◽  
Author(s):  
Feng Xia ◽  
Q. M. Zhang
Keyword(s):  
Thin Films ◽  
Vinylidene Fluoride ◽  
Bias Field ◽  
Polarization Switching ◽  
Interface Effect ◽  
Metal Electrodes ◽  
Poly Vinylidene Fluoride ◽  
Work Functions ◽  
Metal Work ◽  
Bulk Effect

ABSTRACTFerroelectric polymer thin films have been investigated for applications such as sensors, MEMS, and memory devices, just name a few. In these thin film devices, it is anticipated that the interface effect will play an important role in determining the device performance. In this paper, we present the results of a recent study on the influence of metal electrodes on ferroelectric switching behavior of poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) polymer thin films. The results show that the influence of metal electrodes on the polarization response can be divided into two effects, the bulk effect and interface effect. The bulk effect manifests itself as the built-in bias field when metal electrodes with different work functions were used on the two surfaces of the P(VDF-TrFE) film. The interface effect is more complicated but is directly related to the metal work function. For a metal I/insulator (ferroelectric film)/metal II (MIM) sandwich structure in which the metal I and metal II possess different work functions, the low frequency polarization hysteresis loop shows asymmetric response (different switching fields). The polarization switching time also depends on whether the applied voltage is in parallel or anti-parallel to the built-in bias field. In the fast polarization switching process, it was observed that the interface effect plays a dominating role and the switching time is mainly limited by the charge injection from metal electrodes to the polymer film. For metal electrodes with higher work function, higher injection currents and hence faster polarization switching were observed. The results from I-V studies also show that the charge injection process is a Schottky type and the barrier height estimated from the temperature dependence of the I-V curves is consistent with the metal work functions used.

Rotation of polar axis of β-form poly(vinylidene fluoride) under high electric field

1984 ◽  
Vol 57 (1) ◽  
pp. 139-149 ◽  
Author(s):  
Ken'ichi Nakamura ◽  
Yoshikichi Teramoto ◽  
Naohiro Murayama
Keyword(s):  
Electric Field ◽  
Vinylidene Fluoride ◽  
Polar Axis ◽  
High Electric Field ◽  
Poly Vinylidene Fluoride

Experiment and Analysis on High-Electric-Field Transport in Epitaxial YBaCuO Thin Films

1991 ◽  
Vol 30 (Part 1, No. 12A) ◽  
pp. 3355-3363
Author(s):  
Ken Sakuta ◽  
Katunori Asano ◽  
Syuji Arisaka ◽  
Ken-ichi Matsui ◽  
Takeshi Kobayashi
Keyword(s):  
Thin Films ◽  
Electric Field ◽  
High Electric Field

LARGE ELECTROCALORIC EFFECT IN RELAXOR FERROELECTRICS

2012 ◽  
Vol 02 (03) ◽  
pp. 1230011 ◽  
Author(s):  
SHENG-GUO LU ◽  
QIMING ZHANG
Keyword(s):  
Thin Films ◽  
Phase Transition ◽  
Electric Field ◽  
Vinylidene Fluoride ◽  
High Energy ◽  
Relaxor Ferroelectrics ◽  
Temperature Phase ◽  
Electrocaloric Effect ◽  
Heating And Cooling ◽  
Temperature Phase Transition

Organic and inorganic relaxor ferroelectrics used for electrocaloric effect (ECE) applications are introduced. Relaxor ferroelectrics offer several advantages for ECE devices, e.g., infinite states without applying electric field, field-induced large polarization, no-hysteresis of heating and cooling, small-hysteresis polarization loss, room temperature phase transition, and broad temperature range. The ECE in relaxor ferroelectrics under a high electric field can be described using a theory similar to that for first-order phase transition materials. Large ECE was observed directly in high-energy electron irradiated poly(vinylidene fluoride–trifluoroethylene) (P(VDF–TrFE)) 68/32 mol% copolymers, P(VDF–TrFE–CFE) (CFE-chlorofluoroethylene) 59.2/33.6/7.2 mol% terpolymers, P(VDF–TrFE–CFE)–P(VDF–CTFE) (CTFE-chlorotrifluoroethylene) 95/5 wt% terpolymer blended films, and (PbLa)(ZrTi)O3 (PLZT) ceramic thin films. ECE reported in Pb(Sc1/2Ta1/2)O3 (PST), Pb(Mg1/3Nb2/3)O3–PbTiO3 (PMN–PT) thin films is also summarized. Finally, the perspective of ECE devices is illustrated.

scholarly journals Influence of Different Solvents and High-Electric-Field Cycling on Morphology and Ferroelectric Behavior of Poly(Vinylidene Fluoride-Hexafluoropropylene) Films

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3884
Author(s):  
Till Mälzer ◽  
Lena Mathies ◽  
Tino Band ◽  
Robert Gorgas ◽  
Hartmut S. Leipner
Keyword(s):  
Phase Composition ◽  
Electric Field ◽  
Surface Structure ◽  
Electric Fields ◽  
Vinylidene Fluoride ◽  
High Electric Field ◽  
Crystal Phase ◽  
Shielding Effect ◽  
Ferroelectric Behavior ◽  
Field Cycling

P(VdF-HFP) films are fabricated via a solution casting doctor blade method using high (HVS) and low (LVS) volatile solvents, respectively. The structural properties and the ferroelectric behavior are investigated. The surface structure and crystal phase composition are found to be strongly dependent on the type of solvent. LVS leads to a rougher copolymer surface structure with large spherulites and a lower crystallinity in contrast with HVS. The crystalline phase of copolymer films fabricated with HVS consists almost exclusively of α-phase domains, whereas films from LVS solution show a large proportion of γ-phase domains, as concluded from Raman and X-ray diffraction spectra. Virgin films show no ferroelectric (FE) switching polarization at electric field amplitudes below 180 MV/m, independent of the solvent type, observed in bipolar dielectric displacement—electric field measurements. After applying electric fields of above 180 MV/m, a FE behavior emerges, which is significantly stronger for LVS films. In a repeated measurement, FE polarization switching already occurs at lower fields. A shielding effect may be related to this observation. Additionally, Raman bands of polar γ-phase increase by high-electric-field cycling for the LVS sample. The solvent used and the resulting crystal phase composition of the virgin sample is crucial for the copolymer behavior during bipolar electrical cycling.

High electric field transport of the epitaxial YBaCuO thin films

1991 ◽  
Vol 27 (2) ◽  
pp. 1178-1181 ◽  
Author(s):  
K. Asano ◽  
K. Sakuta ◽  
T. Kobayashi
Keyword(s):  
Thin Films ◽  
Electric Field ◽  
High Electric Field
Sign in / Sign up

Export Citation Format

Share Document