Bias dependent conduction and relaxation mechanism study of Cu5FeS4 film and its significance in signal transport network

Sil, Sayantan; Datta, Joydeep; Das, Mukunda P.; Jana, Rajkumar; Halder, Soumi; Biswas, Animesh; Sanyal, Dirtha; Ray, Partha Pratim

doi:10.1007/s10854-017-8463-4

Cited by 36 publications

(27 citation statements)

References 57 publications

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“…At very high frequencies 5 ] 5 H , dipoles will be completely unable to follow the field and the polarization is stopped. Thus, a % decreased and attained a constant value [26]. On the other hand, we note that in all samples, the dielectric constant increases with increasing temperature due to the fact that, an increase in temperature facilitates more and more dipole to be oriented along the electric field and a % increases also with increasing Eu dopant concentration.…”

Section: Dielectric Analysismentioning

confidence: 67%

“…Furthermore, as shown in the inset of figure 5(a), the peaks of # %% shifts towards higher frequency as the temperature increases which implies that the rate of hopping of localized charge carrier increases [25]. Moreover, the asymmetric broadening of peaks indicates the non-Debye relaxation involved with electrical processes in the material [26].…”

Section: Impedance Spectroscopy Analysismentioning

confidence: 91%

“…As an example, figure 7(a) shows a % as a function of 234 5 of Cu 1-x Eu x S (x=0.05) nanoparticles at different temperatures. On the one hand, it is observed that a % decreases gradually with the increase of the frequency and attains an almost constant value at higher frequencies; at low frequencies 5 c 5 H , a % depends on four types of polarization (electronic, ionic, orientation and space charge polarizations) [26]. As the frequency is increased 5 0 5 H , the orientation polarization is decreased and dipoles begin to lag behind the electric field, which can cause the reduction of the value of a % with increase in frequency.…”

Section: Dielectric Analysismentioning

confidence: 98%

“…The complex permittivity is given by, a $ a % &a %% (10) where a % is the dielectric constant and a %% is the dielectric loss. a % and a %% can be calculated using the following relations [26],…”

Section: Dielectric Analysismentioning

confidence: 99%

“…where, ) H ε [ 7 is the free space capacitance [26] and ε H is the free space permittivity. The dielectric loss tangent < b is given by the relation below,…”

Section: Dielectric Analysismentioning

confidence: 99%

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Structural, Optical and Electrical Properties of Eu-doped CuS Nanoparticles Synthesized Through the Aqueous Route

Loudhaief¹,

Salem²,

Zouaoui³

2020

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Eu-doped CuS nanoparticles stabilized by L-cysteine were synthesized by a low-temperature soft aqueous route. X-Ray Diffraction (XRD) patterns of the synthesized products reveal the formation of the hexagonal structure of covellite CuS. Scanning Electron Microscopy (SEM) images depict that the as-prepared nanoparticles exhibit relatively sphere like shaped morphology. Transmission Electron Microscopy (TEM) analyses show that the average size of the nanoparticles was found to be reduced with increasing the Eu concentration. UV-Visible optical absorption measurements reveal that the optical band gap is increased with increasing the Eu concentration, showing the presence of a blue shift due to quantum size effects. Impedance spectra were well modelled by introducing an electrical equivalent circuit. The electrical conductivity was found to be increased with increasing the Eu concentration. The temperature dependence of the DC conductivity confirmed the semiconducting nature of the as-prepared nanoparticles and was found to obey the Arrhenius law with two activation energies. The frequency dependence of the AC conductivity has been analyzed by Jonscher's power law suggesting the non-overlapping small polaron tunneling (NSPT) type of conduction. The polaron hopping energy was found to be increased with increasing the Eu concentration. The dielectric constant of the as-synthesized nanoparticles was found to be decreased with the increase in Eu concentration. The dielectric loss tangent was found to be decreased and then increased at higher frequencies with increasing the Eu concentration.

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Section: Dielectric Analysismentioning

confidence: 67%

Section: Impedance Spectroscopy Analysismentioning

confidence: 91%

Section: Dielectric Analysismentioning

confidence: 98%

Section: Dielectric Analysismentioning

confidence: 99%

“…where, ) H ε [ 7 is the free space capacitance [26] and ε H is the free space permittivity. The dielectric loss tangent < b is given by the relation below,…”

Section: Dielectric Analysismentioning

confidence: 99%

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