AC electrical conductivity and dielectric studies of bulk p-quaterphenyl

We report here the structural, FTIR, optical and dielectric properties of Zn1-xAlxO with x = 00.00 < x < 0.20)). The wurtzite structure is conformed to all samples and the lattice constants, crystallite diameter, porosity and average crystalline size are generally decreased. The residual stress is compressive for pure samples, but it is changed to tensile for the doped samples. Interestingly, Debye temperature and elastic modulus are increased as x increases to 0.10, followed by a decrease at x = 0.20. Two different energy gaps Egh and Egl are apparent for each sample, corresponding of two transition absorption peaks. Interestingly, the ΔE = (Egh -Egl) ~ 0.60 for all samples. Further, the residual dielectric constant is decreased by increasing x to 0.10, followed by a sharp increase at x = 0.20 while the opposite behavior for (N/m * ). The dielectric constant ε′ is slightly increased as x increases to 0.025, followed by a sharp increase as x increases to 0.20, as well as the ac conductivity σ / . The conduction is electronic for x < 0.025 samples, but it is changed to hole with an increase of x to 0.20. The binding energy Wm was decreased as x increases to 0.20, but there is no exact trend against x for the behaviors of minimum hopping distance Rmin and density of localized states N. In addition, the density of states at Fermi level N (EF) has an optimum value at 195 KHz for all samples. The F-factor for solar cell design is increased as x increases to 0.10, but it is almost constant at x = 0.20. The Cole-Cole plot is a straight line for x = 0.00, a semicircle arc for x = 0.025 and a complete semicircle for x > 0.05. The impedance resistance of grain Z \ (g) and grain boundaries Z \ (gb) are gradually decreased by increasing x to 0.20. These outcomes indicate that the addition of Al to ZnO shifts the mechanical, optical, and dielectric medium to higher values, which is strongly recommended for the design of optoelectronic and solar cell instruments.

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“…The real ε′ part of the sample dielectric constant is determined by using the relation [125][126][127];…”

Section: 4-dielectric Measurementsmentioning

confidence: 99%

Structural, FTIR, optical and dielectric properties of Zn1-xAlxO ceramics for advanced applications

2022

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“…29 On the other hand, long-range transport of charge carries is only permitted in the frequency domain below the maximum relaxation peak of M 2 . 30 At higher frequency exceeding the correlated frequency of the maximum peak, the depth of the potential barrier becomes greater. Consequently, ionic groups and free-radical segments can move only short distances due to the high confining potential well.…”

Section: Dielectric Modulusmentioning

confidence: 99%

“…27 These characteristic features have been clearly observed for many organic molecules. 7,10,15,23,25,30,31 Furthermore, the frequency dependence in the AC conductivity regime can be explained by Jonscher's power law: 23…”

Section: Ac Conductivitymentioning

confidence: 99%

Dielectric Properties and AC Conductivity of Organic Films of Copper(II) 2,9,16,23-Tetra-tert-butyl-29H,31H- phthalocyanine

Darwish

Alharbi

Hawamdeh

et al. 2019

Journal of Elec Materi

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Copper(II) 2,9,16,23-tetra-tert-butyl-29H,31H-phthalocyanine (CuTTBPc) thin films have been obtained using a physical vapor deposition technique. X-ray diffraction analysis confirmed their amorphous nature. The dielectric constant and electrical conductivity were measured over the frequency range from 50 Hz to 8 MHz and temperature range from 293 K to 393 K. The dependence of the dielectric relaxation spectra on frequency at different temperatures was measured and discussed. In addition, the spectral dynamics of both the real and imaginary parts of the complex electric modulus over a wide temperature range is explained. The activation energy of the relaxation process (DE M) was estimated to be 0.26 eV. Moreover, the dependence of the alternating current conductivity on both temperature and frequency was investigated. Additionally, the exponent (s) of the power law of conductivity versus temperature confirmed that the correlated barrier hopping (CBH) model is a successful and appropriate mechanism to explain the charge transportation inside CuTTBPc films. According to this model, the density of localized states N(E F) at room temperature and frequency of 500 kHz was evaluated to be 4.11 9 10 23 eV À1 cm À3. This high density of electron states indicates that CuTTBPc can be recommended as a candidate material for use in solar cells.

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“…Moreover, through the dielectric analysis, they were able to show that the material is continuous and unbroken, meaning that there are no grain boundaries within the polymer, with only a slight amount of impurity and defect concentrations. In addition, the dielectric constant values of P-terphenyl are very high compared to other organic polymers [24].…”

Section: Introductionmentioning

confidence: 95%

Dielectric Properties, AC Conductivity, and Electric Modulus Analysis of Bulk Ethylcarbazole‐Terphenyl

Bouaamlat

Hadi²,

Belghiti³

et al. 2020

Advances in Materials Science and Engineering

116

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Electrical and dielectric properties for bulk ethylcarbazole-terphenyl (PEcbz-Ter) have been studied over frequency range 1 kHz–2 MHz and temperature range (R.T –120°C). The copolymer PEcbz-Ter was characterised by using X-ray diffraction. The frequency dependence of the dielectric constant (εr′) and dielectric loss (εr″) has been investigated using the complex permittivity. εr′ of the copolymer decreases with increasing frequency and increases with temperature. AC conductivity (σac) data were analysed by the universal power law. The behaviour of σac increases with increasing temperature and frequency. The change of the frequency exponent (s) with temperature was analysed in terms of different conduction mechanisms, and it was found that the correlated barrier-hopping model is the predominant conduction mechanism. The electric modulus was used to analyze the relaxation phenomenon in the material.

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AC electrical conductivity and dielectric studies of bulk p-quaterphenyl

Cited by 34 publications

References 35 publications

Structural, FTIR, optical and dielectric properties of Zn1-xAlxO ceramics for advanced applications

Structural, FTIR, optical and dielectric properties of Zn1-xAlxO ceramics for advanced applications

Dielectric Properties and AC Conductivity of Organic Films of Copper(II) 2,9,16,23-Tetra-tert-butyl-29H,31H- phthalocyanine

Dielectric Properties, AC Conductivity, and Electric Modulus Analysis of Bulk Ethylcarbazole‐Terphenyl

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