Electrical conduction in dielectrics at high fields

Adamec, Vladimír; Calderwood, J.H.

doi:10.1088/0022-3727/8/5/015

Cited by 123 publications

(32 citation statements)

References 14 publications

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“…The data show that at electric field below 550 MV/m, the P(MDA/MDI) films display an efficiency of 96%, similar to those of the low loss polymer dielectrics such as biaxially oriented polypropylene (BOPP) [18]. At higher field, the efficiency drops, due to increased conduction at high field [10,[18][19][20].…”

Section: Resultsmentioning

confidence: 86%

“…In dielectric polymers, there exist many types of conduction processes, some of which are interface controlled such as the Φ is the barrier height, U is the activation energy, V is the applied voltage, k is the Boltzmann constant, and T is temperature [18][19][20][21][22][23][24][25][26]. All these conductions exhibit non-linear increase with applied field and can become significant at high electric field.…”

Section: Resultsmentioning

confidence: 99%

“…All these conductions exhibit non-linear increase with applied field and can become significant at high electric field. Many early studies have shown that the dielectric polymers exhibit high conduction loss at high field and the conduction processes are non-linear with electric field [18][19][20]. Although the conduction current data deduced from non-steady state conditions through equation (3) are different from the steady state current data measured under constant applied field, the trend of temperature or field dependence is similar in both cases and can be used to reveal the conduction mechanism.…”

Section: Resultsmentioning

confidence: 99%

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Nonlinear conduction in aromatic polyurea thin films and its influence on dielectric applications over a broad temperature range

Wang

Zhou

Lin

et al. 2010

IEEE Trans. Dielect. Electr. Insul.

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We investigate nonlinear conduction in aromatic polyurea thin films and its influence on the dielectric applications over a broad temperature range. The experimental data indicate that several high field conduction mechanisms coexist in the polymer films and one conduction mechanism may dominate over the others depending on different temperatures. The results also reveal that owing to the non-linear increase of the conduction loss with field, the dielectric loss at high field can be many orders of magnitude larger than that at low field. Therefore, besides the electrical breakdown strength, the conduction loss at high field and their temperature dependence behavior are other key factors in developing polymer dielectric materials for high energy density dielectric applications over a broad temperature range.Index Terms -Dielectric loss, conduction, dielectric materials, high energy density polymer capacitors.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Nonlinear conduction in aromatic polyurea thin films and its influence on dielectric applications over a broad temperature range

Wang

Zhou

Lin

et al. 2010

IEEE Trans. Dielect. Electr. Insul.

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“…The activation energy E a of the conduction phenomenon obtained through the linear fit using equation (6) • C, such as for polypyromellitimide films [55][56][57], and usually resulting from the conduction current experiments under static polarization. Such conductivity values indicate the semiinsulating character of the PI materials in such a wide temperature range close to the glass transition temperature.…”

Section: -P5mentioning

confidence: 99%

Dielectric measurements in large frequency and temperature ranges of an aromatic polymer

Diaham

Locatelli

Lebey

et al. 2009

Eur. Phys. J. Appl. Phys.

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Abstract. The characterization of the BPDA/PDA polyimide (PI) at high temperature up to 400• C, thanks to dielectric relaxation spectroscopy (DRS) in the 10 −1 Hz to 10 6 Hz frequency range, allows the determination of the dc electrical conductivity (σ dc ). In such a high temperature range, the dielectric spectra are modified by the extrinsic electrode polarization phenomenon (EP) response. A model is proposed which coupled to the DRS results allows evidencing and quantifying the effect of the EP. The proposed method gives a simple way to determine the intrinsic σ dc values from the effective ac dielectric response, improving the accuracy and reducing the duration of measurement.

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“…[4][5][6]9 The electrical conduction behaviors of PMDA/ODA films have been investigated by several research groups. [10][11][12][13][14][15][16][17][18][19] Sawa et al 13 studied the electric conduction current of PMDA/ODA films at temperatures of 120-180 1C and applied electric fields of 4 À500 kV cm À1 . They concluded that the conduction in the PI films is caused by ionic hopping.…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence of electric conduction in polyimides with main chain triphenylamine structures

Takizawa

Asai

Ando

2014

Polym J

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The temperature dependence of electric current was investigated in polyimides (PIs) with different chemical structures to clarify the electric conduction mechanisms in PI films. The current density of the PIs with main chain triphenylamine (TPA) structures (pyromellitic dianhydride/4,4 0 -diamino-4 00 -methyltriphenylamine (DATPA) and 3,4,3 0 ,4 0 -biphenyltetracarboxylic dianhydride/ DATPA) significantly increased above 120 1C. This was most likely due to an exponential increase in the number of thermally excited electron carriers. This interpretation was supported by a comparison of the activation energies (E a ) obtained from the temperature dependence of the current density and the energy gaps (E g ) estimated by cyclic voltammetry. In contrast, the current densities of fully aromatic and semi-aliphatic PIs without TPA structures exhibited much smaller temperature dependencies. The limited number of thermally excited carriers in these PIs (due to their large E g values) suggests that the ionic current is the dominant factor, rather than the electronic current. INTRODUCTIONFully aromatic polyimides (PIs) derived from pyromellitic dianhydride and bis(4-aminophenyl)ether (PMDA/ODA) or from 3,3 0 , 4,4 0 -biphenyltetracarboxylic dianhydride and p-phenylene diamine (s-BPDA/PPD) represent super-engineered plastics that exhibit high thermal and chemical stability, flame resistance, radiation resistance, mechanical strength, insulating properties and good flexibility. 1 Therefore, PIs have been widely employed in integrated circuits, semiconductor devices and electronic components. In addition, PIs have a variety of functionalities that make them an attractive new class of thermally stable electronic and optical materials. 2-9 For example, PIs containing triphenylamine (TPA) structures and their derivatives have been applied to memory devices, photogeneration and electrochromic materials. [4][5][6]9 The electrical conduction behaviors of PMDA/ODA films have been investigated by several research groups. 10-19 Sawa et al. 13 studied the electric conduction current of PMDA/ODA films at temperatures of 120-180 1C and applied electric fields of 4 À500 kV cm À1 . They concluded that the conduction in the PI films is caused by ionic hopping. Sessler et al. 15 studied two-side metallized PMDA/ODA films to investigate interface-controlled currents. They also examined oneside metallized film subject to positive-corona charge injection to investigate bulk-controlled currents. The electric currents measured from the one-side metallized films were significantly larger than those measured from the two-side metallized films at temperatures below 200 1C. Thus, the currents measured for the two-side metallized films were considered to be interface controlled. This indicates that both

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Electrical conduction in dielectrics at high fields

Cited by 123 publications

References 14 publications

Nonlinear conduction in aromatic polyurea thin films and its influence on dielectric applications over a broad temperature range

Nonlinear conduction in aromatic polyurea thin films and its influence on dielectric applications over a broad temperature range

Dielectric measurements in large frequency and temperature ranges of an aromatic polymer

Temperature dependence of electric conduction in polyimides with main chain triphenylamine structures

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