Air-gap thermally stimulated discharge currents in PVDF-PMMA double-layered samples

Saxena, P.; Shukla, Prashant; Gaur, M. S.

doi:10.1007/s10973-021-10680-y

Cited by 5 publications

(5 citation statements)

References 38 publications

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“…However, depolarization occurs when the external electric field is removed, which seriously affects the performance of the piezoelectric material. 48,49 In contrast, the free electrons migrated and aggregated at the PVDF/CsPbBr 3 composite interface. Meanwhile, the more insulating PVDF layer acts as a barrier layer, giving the composite a built-in electric field, which leads to dipole poling.…”

Section: Resultsmentioning

confidence: 99%

The mechanism of a PVDF/CsPbBr₃ perovskite composite fiber as a self-polarization piezoelectric nanogenerator with ultra-high output voltage

et al. 2022

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Section: Resultsmentioning

confidence: 99%

The mechanism of a PVDF/CsPbBr₃ perovskite composite fiber as a self-polarization piezoelectric nanogenerator with ultra-high output voltage

et al. 2022

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“…Interphase charges in poly(vinylidene fluoride) (PVDF)-poly(methyl methacrylate) PMMA double-layered dielectric polymer thin films were investigated in [ 63 ]. The authors suggest that the polymer-polymer interface creates localized states of different depths, which lead to capture sites distributed over much greater energy levels.…”

Section: Resultsmentioning

confidence: 99%

Non-Conjugated Poly(Diphenylene Phthalide)—New Electroactive Material

Karamov,

Galiev,

Lachinov

et al. 2023

Polymers

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In organic electronics, conjugated conductive polymers are most widely used. The scope of their application is currently very wide. Non-conjugated polymers are used much less in electronics and are usually used as insulation materials or materials for capacitors. However, the potential of non-conjugated polymers is much wider, due to the fact that new electronic materials with unique electronic properties can be created on the basis of non-conjugated polymers, as well as other inorganic dielectrics. This article demonstrates the possibilities of creating electrically conductive materials with unique electronic parameters based on non-conjugated polymers. The results of the study of the sensory properties of humidity are given as examples of the practical application of the structure. The abnormal electronic properties are realized along the interface of two polymer dielectrics with functional polar groups. The submicron films of polydiphenylenephthalide were used as a dielectric. It is shown that a quasi-two-dimensional electronic structure with abnormally large values of conductivity and mobility of charge carriers occurs along the interface. These structures are often called quasi-two-dimensional electron gas (Q2DEG). This article describes the manufacturing processes of multielectrode devices. Polymer films are deposited via the spin-coating method with polymer solutions in cyclohexanone. The metal electrodes were manufactured through thermal deposition in a vacuum. Three types of metal electrodes made of aluminum, copper and chromium were used. The influence of the electron work function of contacting metals on the electronic parameters of the structure was studied. It was established that the work function decrease leads to an increase in the conductivity and mobility of charge carriers. The charge carrier parameters were estimated based on the analysis of the current-voltage characteristics within the space-charge-limited current technique. The Richardson-Schottky thermionic emission model was used to evaluate values a potential barrier at metal/organic interfaces. It was established that the change in ambient humidity strongly affects the electronic transport properties along the polymer/polymer interface. It is demonstrated that the increase in conductivity with an increase in humidity occurs due to an increase in the mobility of charge carriers and a decrease in the height of the potential barrier at the three-dimensional metal contact with two-dimensional polymer interface. The potential barrier between the electrode and the bulk of the polymer film is significantly higher than between the electrode and the quasi-two-dimensional polymer structure.

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“…The polymer films were carefully pulled away from the glass plate. PVDF: PSF weight percentage ratios of 90:10, 70:30, and 50:50 were used to make polyblend films of various compositions 11–14 . The prepared circular films had a thickness of 50 μm and a diameter of 5 cm.…”

Section: Methodsmentioning

confidence: 99%

“…PVDF: PSF weight percentage ratios of 90:10, 70:30, and 50:50 were used to make polyblend films of various compositions. [11][12][13][14] The prepared circular films had a thickness of 50 μm and a diameter of 5 cm. To create the ohmic contact, both surfaces of the polymer blend samples were vacuum aluminized using a Hindhivac Vacuum coating unit with Penning and Pirani pressure gauges, ST-A6P3, over a central circular region of 3.5 cm in diameter.…”

Section: Methodsmentioning

confidence: 99%

Analysis of dielectric behavior of PVDF: PSF polyblends at lower frequency range from measurements of transient absorption and desorption currents

Saxena¹,

Shukla

2021

J of Applied Polymer Sci

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Transient current measurements were carried out for polyvinylidene fluoride:polysulfone (PVDF:PSF) blends films of different ratios under different polarizing fields and polarizing temperatures in absorption and desorption mode. The time‐dependent desorption current in polymer blend samples interprets the combined effect of dipole reorientation, space charge dissipation, and hopping of charge carriers. The activation energy has been calculated using the isochronal curve. Thermal activation behaviors of isochronal current in a specific temperature scale followed by a peak centered at about 120–160°C, have indicated the close correlation of transient currents with the dielectric loss peak. The presence of a dielectric loss peak for each polyblend concentration may be due to the existence of relaxing dipoles in the polyblend. With increasing concentration of PSF in the polyblend, this peak tends to shift toward the higher frequency range and suggests the speeding up of the dipolar relaxation process. The dielectric loss factor of polyblend thin films using transient study in absorption and desorption mode using applied step voltage f is related to Hamon's frequency (0.1/t).

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Air-gap thermally stimulated discharge currents in PVDF-PMMA double-layered samples

Cited by 5 publications

References 38 publications

The mechanism of a PVDF/CsPbBr₃ perovskite composite fiber as a self-polarization piezoelectric nanogenerator with ultra-high output voltage

The mechanism of a PVDF/CsPbBr₃ perovskite composite fiber as a self-polarization piezoelectric nanogenerator with ultra-high output voltage

Non-Conjugated Poly(Diphenylene Phthalide)—New Electroactive Material

Analysis of dielectric behavior of PVDF: PSF polyblends at lower frequency range from measurements of transient absorption and desorption currents

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Air-gap thermally stimulated discharge currents in PVDF-PMMA double-layered samples

Cited by 5 publications

References 38 publications

The mechanism of a PVDF/CsPbBr3 perovskite composite fiber as a self-polarization piezoelectric nanogenerator with ultra-high output voltage

The mechanism of a PVDF/CsPbBr3 perovskite composite fiber as a self-polarization piezoelectric nanogenerator with ultra-high output voltage

Non-Conjugated Poly(Diphenylene Phthalide)—New Electroactive Material

Analysis of dielectric behavior of PVDF: PSF polyblends at lower frequency range from measurements of transient absorption and desorption currents

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Product

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The mechanism of a PVDF/CsPbBr₃ perovskite composite fiber as a self-polarization piezoelectric nanogenerator with ultra-high output voltage

The mechanism of a PVDF/CsPbBr₃ perovskite composite fiber as a self-polarization piezoelectric nanogenerator with ultra-high output voltage