Electrical and sensing properties of partially benzylated β-cyclodextrin: Effect of benzyl chain length

Bouzitoun, Mouna; Dridi, C.; Mlika, R.; Chaâbane, Rafik Ben; Ouada, H. Ben; Jabballah, N.; Gam, H.; Majdoub, Mustapha

doi:10.1016/j.snb.2006.10.065

Cited by 7 publications

(10 citation statements)

References 18 publications

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“…increasing bias voltage and the plot remains constant, for the low frequency range, between 0 and 1 V. The slope 1/2 means that the curvature is semicircular [46]. This behaviour has been observed in several ITO/organic material/Al devices [47,48].…”

Section: Transport Phenomena In Ito/pvk:tio 2 /Al Diodes (In the Dark)supporting

confidence: 55%

“…The layer was either a conjugated polymer (such as PPV derivatives) or ionophores (cyclodextrin, calix [4]arene) [7,[47][48][49][50]. It can be considered that the chain conformation and chemical structure of the organic matrix do not change with the applied voltage (>1 V), and hence PVK has a dominant effect on the AC electrical conduction.…”

Section: Ac Transport: Impedance Spectroscopy and Bulklimited Currentmentioning

confidence: 99%

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Investigation of exciton photodissociation, charge transport and photovoltaic response of poly(N-vinyl carbazole):TiO₂nanocomposites for solar cell applications

et al. 2008

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The photogeneration of charge carriers in spin-coated thin films of nanocrystalline (nc-)TiO(2) particles dispersed in a semiconducting polymer, poly(N-vinylcarbazole) (PVK), has been studied by photoluminescence and charge transport measurements. The solvent and the TiO(2) particle concentration have been selected to optimize the composite morphology. A large number of small domains leading to a large interface and an improved exciton dissociation could be obtained with tetrahydrofuran (THF). The charge transport mechanism and trap distribution at low and high voltage in ITO/nc-TiO(2):PVK/Al diodes in the dark could be identified by current-voltage measurements and impedance spectroscopy. The transport mechanism is space charge limited with an exponential trap distribution in the high voltage regime (1-4 V), whereas a Schottky process with a barrier height of about 0.9 eV is observed at low bias voltages (<1 V). The current-voltage characteristics under white illumination have shown a dramatic increase of the short circuit current density J(sc) and open circuit voltage V(oc) for a 30% TiO(2) volume content corresponding to the morphology exhibiting the best dispersion of TiO(2) particles. A degradation of the photovoltaic properties is induced at higher compositions by the formation of larger TiO(2) aggregates. A procedure has been developed to extract the physical parameters from the J-V characteristics in the dark and under illumination on the basis of an equivalent circuit. The variation of the solar cell parameters with the TiO(2) composition confirms that the photovoltaic response is optimum for 30% TiO(2) volume content. It is concluded that the photovoltaic properties of nc-TiO(2):PVK nanocomposites are controlled by the interfacial area between the donor and the acceptor material and are limited by the dispersion of the TiO(2) nanoparticles in the polymer.

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Section: Transport Phenomena In Ito/pvk:tio 2 /Al Diodes (In the Dark)supporting

confidence: 55%

Section: Ac Transport: Impedance Spectroscopy and Bulklimited Currentmentioning

confidence: 99%

Investigation of exciton photodissociation, charge transport and photovoltaic response of poly(N-vinyl carbazole):TiO₂nanocomposites for solar cell applications

et al. 2008

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“…Where Here, in this case, the only first region is taken where log J varies directly with log E suggesting the presence of Ohmic conduction in studied compounds. In the region of the high electric field, the values of the slope are found to be ≈ 2 indicating SCLC is absent, hence only at lower voltage region is considered for application [81]. The Ohmic, as well as SCLC conduction mechanisms can also be described by the following relation,…”

Section: Je Characteristicsmentioning

confidence: 99%

Studies of structural and electrical characteristics of multi-substituted Bi0.5Na0.5TiO3 ferroelectric ceramics

Arya

Choudhary

2021

J Mater Sci: Mater Electron

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In this communication, preliminary structural and detailed electrical characteristics of the CaSnO3/CaSeO3 modified Bi0.5Na0.5TiO3 ceramics of a general chemical composition (1-2x) [Bi0.5Na0.5TiO3] + x (CaSnO3) + x (CaSeO3) with x= 0, 0.05, 0.10, 0.15, prepared by hightemperature solid-state reaction method with calcination and sintering temperature 925 o C and 950 o C respectively for 5 h, have been reported. Structural and electrical characteristics of the parent compound have significantly been tailored by the addition of the equal percentage of CaSnO3, CaSeO3 over a wide range of temperature (25 o C -400 o C) as well as frequency (1 kHz-1MHz). Analysis of room temperature X-ray diffraction (XRD) data confirmed the development of single-phase compound (with rhombohedral symmetry) with very small amount of impurity phase with higher concentrations (x). In the dielectric spectroscopy, two dielectric peaks are observed at around temperatures 210 o C and 320 o C indicating multiple phase transitions of different types including the ferroelectric to para-electric through anti-ferroelectric. Impedance analysis of data exhibits both negative/positive temperature coefficient of temperature (i.e., semiconductor behavior) of the materials. The Nyquist plots determine the grain and grain boundary effect in capacitive and resistive properties of the materials, and also the non-Debye type of relaxation. The room temperature hysteresis loop confirms the existence of ferroelectricity in the materials. The leakage current characteristics also determine the Ohmic behavior of the materials.

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“…In recent years, studies of electrical and optical properties of conjugated polymer have attracted much attention in view of their application in electronic and optical devices such as chemical sensors [1,2], solar cells [3,4], electroluminescent devices [5,6] and organic thin-film transistors (OTFTs) based on conjugated polymers [7,8] have undergone significant progress due to many advantages such as light weight, low-cost, and good compatibility with solution-processes that are promising for the fabrication of flexible large-area devices [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Effect of the side-chain size on the optical and electrical properties of confined-PPV derivatives

Benzarti-Ghédira

Hrichi

Jaballah

et al. 2015

Superlattices and Microstructures

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Electrical and sensing properties of partially benzylated β-cyclodextrin: Effect of benzyl chain length

Cited by 7 publications

References 18 publications

Investigation of exciton photodissociation, charge transport and photovoltaic response of poly(N-vinyl carbazole):TiO₂nanocomposites for solar cell applications

Investigation of exciton photodissociation, charge transport and photovoltaic response of poly(N-vinyl carbazole):TiO₂nanocomposites for solar cell applications

Studies of structural and electrical characteristics of multi-substituted Bi0.5Na0.5TiO3 ferroelectric ceramics

Effect of the side-chain size on the optical and electrical properties of confined-PPV derivatives

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Electrical and sensing properties of partially benzylated β-cyclodextrin: Effect of benzyl chain length

Cited by 7 publications

References 18 publications

Investigation of exciton photodissociation, charge transport and photovoltaic response of poly(N-vinyl carbazole):TiO2nanocomposites for solar cell applications

Investigation of exciton photodissociation, charge transport and photovoltaic response of poly(N-vinyl carbazole):TiO2nanocomposites for solar cell applications

Studies of structural and electrical characteristics of multi-substituted Bi0.5Na0.5TiO3 ferroelectric ceramics

Effect of the side-chain size on the optical and electrical properties of confined-PPV derivatives

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Investigation of exciton photodissociation, charge transport and photovoltaic response of poly(N-vinyl carbazole):TiO₂nanocomposites for solar cell applications

Investigation of exciton photodissociation, charge transport and photovoltaic response of poly(N-vinyl carbazole):TiO₂nanocomposites for solar cell applications