Activation energy of polarization due to electrical conductivity and dipole rotation in purified ca-bentonite

Küçükçelebi, Hayreddin; Durmuş, Haziret; Deryal, Abdullah; Taşer, Mehmet; Karakaya, Necati

doi:10.1016/j.clay.2012.04.007

Applied Clay Science

2012

DOI: 10.1016/j.clay.2012.04.007

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Activation energy of polarization due to electrical conductivity and dipole rotation in purified ca-bentonite

Hayreddin Küçükçelebi¹,

Haziret Durmuş²,

Abdullah Deryal³

et al.

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Cited by 8 publications

(1 citation statement)

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“…The relaxation time, τ, is defined asin which τ 0 is the relaxation time at high temperatures, E A the activation energy, and T 0 the temperature at which the relaxation time could be considered as “infinitely slow”. 32,33…”

mentioning

confidence: 99%

Charge Carriers Are Not Affected by the Relatively Slow-Rotating Methylammonium Cations in Lead Halide Perovskite Thin Films

Caselli

Fischer

Meggiolaro

et al. 2019

J. Phys. Chem. Lett.

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Recently, several studies have investigated dielectric properties as a possible origin of the exceptional optoelectronic properties of metal halide perovskites (MHPs). In this study we investigated the temperature-dependent dielectric behavior of different MHP films at different frequencies. In the gigahertz regime, dielectric losses in methylammonium-based samples are dominated by the rotational dynamics of the organic cation. Upon increasing the temperature from 160 to 300 K, the rotational relaxation time, τ, decreases from 400 (200) to 6 (1) ps for MAPb-I3 (-Br3). By contrast, we found negligible temperature-dependent variations in τ for a mixed cation/mixed halide FA0.85MA0.15Pb(I0.85Br0.15)3. From temperature-dependent time-resolved microwave conductance measurements we conclude that the dipolar reorientation of the MA cation does not affect charge carrier mobility and lifetime in MHPs. Therefore, charge carriers do not feel the relatively slow-moving MA cations, despite their great impact on the dielectric constants.

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mentioning

confidence: 99%

Charge Carriers Are Not Affected by the Relatively Slow-Rotating Methylammonium Cations in Lead Halide Perovskite Thin Films

Caselli

Fischer

Meggiolaro

et al. 2019

J. Phys. Chem. Lett.

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Bentonite-derived materials preferably with nanocarbon incorporation exhibiting exceptionally high dielectric loss at relatively low electrical conductivity

Delixiati

Chung

2015

J Mater Sci

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Nitrate-intercalated Mg 1−x Al x -Layered Double Hydroxides with different layer charges ( x ): Preparation, characterization, and study by impedance spectroscopy

Lahkale

Elhatimi

Sadik

et al. 2018

Applied Clay Science

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Activation energy of polarization due to electrical conductivity and dipole rotation in purified ca-bentonite

Cited by 8 publications

References 19 publications

Charge Carriers Are Not Affected by the Relatively Slow-Rotating Methylammonium Cations in Lead Halide Perovskite Thin Films

Charge Carriers Are Not Affected by the Relatively Slow-Rotating Methylammonium Cations in Lead Halide Perovskite Thin Films

Bentonite-derived materials preferably with nanocarbon incorporation exhibiting exceptionally high dielectric loss at relatively low electrical conductivity

Nitrate-intercalated Mg 1−x Al x -Layered Double Hydroxides with different layer charges ( x ): Preparation, characterization, and study by impedance spectroscopy

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