On the Determination of Trap Depth from Thermally Stimulated Currents

Maeta, Shigeyoshi; Sakaguchi, Kiyokazu

doi:10.1143/jjap.19.519

Cited by 37 publications

(9 citation statements)

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“…In dielectric materials, the presence of deep traps may reduce the charge conduction at high fields (9). Here, thermally stimulated depolarization current (TSDC) is used to probe the trap states in the PEEU films with different nanofiller loadings (31,32), and the data recorded are presented in fig. S3.…”

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confidence: 99%

A highly scalable dielectric metamaterial with superior capacitor performance over a broad temperature

et al. 2020

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Although many polymers exhibit excellent dielectric performance including high energy density with high efficiency at room temperature, their electric and dielectric performance deteriorates at high temperatures (~150°C). Here, we show that nanofillers at very low volume content in a high-temperature (high–glass transition temperature) semicrystalline dipolar polymer, poly(arylene ether urea), can generate local structural changes, leading to a marked increase in both dielectric constant and breakdown field, and substantially reduce conduction losses at high electric fields and over a broad temperature range. Consequently, the polymer with a low nanofiller loading (0.2 volume %) generates a high discharged energy density of ca. 5 J/cm3 with high efficiency at 150°C. The experimental data reveal microstructure changes in the nanocomposites, which, at 0.2 volume % nanofiller loading, reduce constraints on dipole motions locally in the glassy state of the polymer, reduce the mean free path for the mobile charges, and enhance the deep trap level.

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Section: Downloaded Frommentioning

confidence: 99%

A highly scalable dielectric metamaterial with superior capacitor performance over a broad temperature

et al. 2020

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“…Early dielectric spectroscope studies of PP revealed two dielectric relaxation processes, a dielectric relaxation at low temperature is associated with the glass transition (α relaxation) and the high temperature one (~ 100 °C) is associated with crystallization (β relaxation) [ 18 ]. TSDC is carried out to probe the depolarization peak and trap depth for the polymers associated with the high temperature polymer chain relaxation which is of interest of this study [ 19 ]. As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Improving electric thermal stability of polypropylene by chemically linking small amount of hindered phenol groups

2021

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Thermal stability of polypropylene (PP) over a broad temperature is critical for many applications. Hindered phenol (HP) groups have been utilized in PP for thermal-oxidative protection. This paper studies thermal stability of the electret property of PP linked with 0.2 mol% HP. It is observed that small amount of chemically linked HP groups improves electret thermal stability as reflected by the higher peak temperature of the thermally stimulated discharge curve and about 65% increase in the trap level. In addition, the HP groups in PP generate “rigid backbones” which maintain the PP film shapes to temperatures near the melting (~ 150 °C), compared with pristine PP at 70 °C. Supplementary Information The online version of this article (10.1557/s43580-021-00016-1) contains supplementary material, which is available to authorized users.

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“…The method of TSDC used is different from that described by other researchers . On the one hand, the temperature of the material is increased, and at the same time, the polarized or nonpolarized current is measured.…”

Section: Experimental Results and Analysismentioning

confidence: 99%

“…The latent relaxation time is expressed by (3) :

τ_{0} = \frac{{kT}_{m}^{2}}{E_{T} β} \exp (- \frac{E_{T}}{{kT}_{m}})

where T m is the temperature corresponding to the maximum of TSDC. The integral part of (2) is almost zero at low temperatures, so (2) can be approximated by :

I = A \exp (- \frac{E_{T}}{italickT})

…”

Section: Experimental Results and Analysismentioning

confidence: 99%

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Investigation on dielectrical and space charge characteristics of peek insulation used in aerospace high‐voltage system

Liu

Wang

Hou

et al. 2019

IEEJ Transactions Elec Engng

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Because of the insulation issue in the high-voltage system of spacecrafts, the dielectric and space charge characteristics of polyether-ether-ketone (PEEK) insulating material are studied in this paper. The electric conduction, trap parameters and space charge characteristic of PEEK, especially the space charge distribution after 50 keV high-energy electron radiation, are measured and analyzed, respectively. From the test results, a low DC conductivity (∼10 −16 S/cm) and an activation energy of 0.1-0.2 eV are estimated. It indicates that the conductivity is insensitive to the temperature. In addition, a deep chemical trap (2 eV) is evaluated in the PEEK sample. The slight space charge accumulation and the high threshold field for charge injection of the PEEK sample are dominated by the pulsed electro-acoustic (PEA) results. Compared to the polyimide sample (PI), the space charge accumulations are lower in PEEK, and the charge dispersions in the PEEK after irradiation are faster than those in PI. Based on the experimental results, it can be inferred that the space charge properties are ascribed to the deep traps. From the microstructure analysis, it can be seen that the benzene ring and carbonyl group in the PEEK chemical structure would introduce deep traps, resulting in a higher injection barrier and less space charge accumulation. The results show that PEEK sample is a superior insulating material, and the excellent dielectric and space charge characteristics are beneficial for application in spacecraft.

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On the Determination of Trap Depth from Thermally Stimulated Currents

Cited by 37 publications

References 1 publication

A highly scalable dielectric metamaterial with superior capacitor performance over a broad temperature

A highly scalable dielectric metamaterial with superior capacitor performance over a broad temperature

Improving electric thermal stability of polypropylene by chemically linking small amount of hindered phenol groups

Investigation on dielectrical and space charge characteristics of peek insulation used in aerospace high‐voltage system

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