Dissociating space charge processes from orientation polarization in poly(ethylene naphthalate) films

Hoang, Mai Quyen; Boudou, Laurent; Roy, Séverine Le; Teyssèdre, G.

doi:10.1088/0022-3727/47/45/455306

Cited by 9 publications

(5 citation statements)

References 18 publications

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“…First, coupling trap spectroscopy methods and space charge profile measurements may provide a stepby-step information on if -and how-charge redistribute in the course of scanning. For example, TSDC from dipolar processes can be distinguished from those from space charges release in this way [226]. Using space charge profile measurement methods having the required resolution, it may also be possible identifying the different candidate processes (photogeneration, detrapping, photoconduction) to photo-stimulated discharge, along with evaluating if the photoexcitation goes with material discharges, which is not necessary the case if one have in mind retrapping events occurring in OSL [168].…”

Section: Discussionmentioning

confidence: 99%

Charge trap spectroscopy in polymer dielectrics: a critical review

Teyssèdre¹,

Zheng²,

Boudou³

et al. 2021

J. Phys. D: Appl. Phys.

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Trapping phenomena are essential features controlling the transport properties of insulating materials. Depending on the energy depth, traps can either assist transport or lead to long-lasting storage of charges. The consequences of charge trapping are non-linear phenomena and electric field distribution distortion in the dielectric bulk. The important characteristics about traps are the nature of the levels, their depth in energy, and their density. In this review, we discuss the different techniques available to probe the energetics of traps, particularly in insulating polymers. The methods implemented for approaching the characteristics of traps range from atomistic simulation based on known physical/chemical defects, identification by spectroscopic techniques, and coupled opticalelectrical or thermal-electrical techniques. The review is focused on methods involving thermal or optical excitation coupled to detection using electrical or luminescence response with questioning about the physical hypotheses behind the analysis and the difference in response obtained through the various approaches. The technical implementation of these methods is described, along with examples of application. The differences in trap depth estimation from optical and thermal methods is discussed as well as the impact of having distributed trap depths. The input of luminescence techniques, which provide a fingerprint of chemical groups involved in charge recombination, is put forward.

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Section: Discussionmentioning

confidence: 99%

Charge trap spectroscopy in polymer dielectrics: a critical review

Teyssèdre¹,

Zheng²,

Boudou³

et al. 2021

J. Phys. D: Appl. Phys.

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“…There is no change in the anode side until the ρ peak is discharged. This means that the charge distribution induced by dipolar polarization is just too narrow to show up even with PEA [26]. The cathode side presents a larger signal intensity that decreases to change the charge profile from asymmetric to antisymmetric.…”

Section: Resultsmentioning

confidence: 97%

Study of the charge profile of thermally poled electrets

Parsa,

Trull,

Colom

et al. 2016

Preprint

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The charge profile of thermally poled electrets has been studied using two different methods, laser induced pressure pulse (LIPP) and pulsed electroacoustic (PEA), to gain insight into the mechanisms that are activated and assess which is the most appropriate method to study the charge profile. Disc-shaped PET samples have been conventionally poled to activate both the α and the ρ relaxation and, right after, partially discharged up to a temperature T pd . In this way, samples with a different combination of dipolar and space charge polarization have been obtained. Both LIPP and PEA reveal asymmetric profiles for T pd below the glass transition temperature, that progressively become antisymmetric for higher temperatures. The shape and evolution of the charge profiles can be explained assuming injection of negative carriers from the anode that enhances the trapping of positive carriers near this electrode. It can be observed that PEA is able to detect a wider variety of polarization mechanisms in the system while LIPP gives a simpler picture of the charge profile.

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“…The interfacial polarization peak is only detectable in electrical measurements and not from DMA, DSC, or TGA. The interfacial polarization phenomenon occurs through the accumulation of electrical charge in regions of the electrode-polymer interface or within the polymer bulk [ 8 , 39 , 40 ]. This process is due to the complex structure of the PVB, an amorphous copolymer, which presents traps with different energy levels (shallow and deep traps).…”

Section: Resultsmentioning

confidence: 99%

Dielectric and Viscoelastic Behavior of Polyvinyl Butyral Films

Puente-Córdova,

Rentería-Baltiérrez,

López-Walle

et al. 2023

Polymers

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Dielectric and thermal properties of polyvinyl butyral (PVB) were studied in this work, using dynamic electrical analysis (DEA) at frequencies from 100 Hz to 1 MHz and temperatures from 293 K to 473 K. Two electrical relaxation processes were investigated: glass transition and interfacial polarization. Above the glass transition temperature (~343 K), interfacial polarization dominates conductive behavior in polyvinyl butyral. The framework of the complex electric modulus was used to obtain information about interfacial polarization. The viscoelastic behavior was analyzed through dynamic mechanical analysis (DMA), where only the mechanical manifestation of the glass transition is observed. The experimental results from dielectric measurements were analyzed with fractional calculus, using a fractional Debye model with one cap-resistor. We were successful in applying the complex electric modulus because we had a good correlation between data and theoretical predictions. The fractional order derivative is an indicator of the energy dissipated in terms of molecular mobility, and the calculated values close to 1 suggest a conductive behavior at temperatures above the glass transition temperature of PVB.

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Dissociating space charge processes from orientation polarization in poly(ethylene naphthalate) films

Cited by 9 publications

References 18 publications

Charge trap spectroscopy in polymer dielectrics: a critical review

Charge trap spectroscopy in polymer dielectrics: a critical review

Study of the charge profile of thermally poled electrets

Dielectric and Viscoelastic Behavior of Polyvinyl Butyral Films

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