Dielectric Relaxation Behavior and AC Electrical Conductivity Study of 2-(1,2-Dihydro-7-Methyl-2-Oxoquinoline-5-yl) Malononitrile (DMOQMN)

El-Nahass, M.M.; El-Zaidia, E.F.M.; Darwish, A.A.A.; Salem, G.F.

doi:10.1007/s11664-016-5005-4

Cited by 27 publications

(18 citation statements)

References 37 publications

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“…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%

“…8a, exhibits two remarkable behaviors of s: (1) s decreases as the temperature is increased, and (2) the value of s remains below 1, confirming the appropriateness of the correlated barrier hopping (CBH) model. 7,10,15,23,27,29 In this model, charge transport mainly occurs due to hopping of charges between the two sides of the potential barrier. These findings are in agreement with several reports that investigated the charge transport mechanism in Pc molecules; For instance, Vidadi et al showed that the value of this exponent for MgPc thin films reached a maximum value of 1.75, at high frequencies.…”

Section: Ac Conductivitymentioning

confidence: 99%

“…15,36 Similar observations have also been found for various other inorganic 13,37,38 as well as organic materials. 7,10,15,23,27,29 In general, the activation energy can be calculated by using the Arrhenius equation 23 :…”

Section: Ac Conductivitymentioning

confidence: 99%

“…8 The dipole orientation is also affected by the type of material crystallization, and by the presence of defects and imperfections in the material. 10 The aim of the work presented herein is to examine the effect of tetra-tert-butyl peripheral functional groups on the conductivity and dielectric characteristics of the CuPc molecule. In particular, four tetra-tert-butyl groups are linked with four heterocycles of the CuPc molecule to form 2,9,16,23tetra-tert-butyl-29H,31H-copper phthalocyanine (CuTTBPc, Fig.…”

Section: Introductionmentioning

confidence: 99%

“…This extracted value of DE M is compatible with results reported for large numbers of small organic molecules. 7,10,15,23,[27][28][29]…”

mentioning

confidence: 99%

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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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