Study of some transport properties for the compound 2\ 7\ dichlorofluorescein as an organic semiconductor dye.
Moheb Mourad Micheal Gerges;
Abstract
Structural, dc and ac electrical conductivity and optical properties were studied for 2\,7\ dichlorofluorescein in thin film form.
X-ray diffraction XRD analysis depicts that the investigated compound in thin film forms has amorphous structure but in powder form shows a polycrystalline nature.
Atomic force microscope (AFM) measurement of TiO2/FTO shows that the average particles size are 44.437 nm with roughness equals 20.307 nm.
The optical properties of 2\,7\ dichlorofluorescein thin films of different thickness are studied. Transmittance and reflectance are measured at room temperature, in the wave length range (350–2500 nm), to calculate the optical constants (refractive index n and absorption index k) by Fresnel's equations. The allowed optical transitions were found to be indirect transitions. Analysis of the obtained values of the refractive index yielded the optical high frequency dielectric constant and other optical dispersion parameters , .
The Dc electrical conductivity for 2\,7\ dichlorofluorescein was measured in the temperature range (303-433 K). The electrical resistance was measured as a function of temperature. The obtained results showed that DCF has two values of activation energy and through the considering range of temperature. The first one is the, intermolecular conduction process which result from traveling of the charge carriers from one kind of macromolecule to another which causes lower value for activation energy (region I). The second process is the intramolecular conduction which results from hopping of electrons from one atomic site to another.
X-ray diffraction XRD analysis depicts that the investigated compound in thin film forms has amorphous structure but in powder form shows a polycrystalline nature.
Atomic force microscope (AFM) measurement of TiO2/FTO shows that the average particles size are 44.437 nm with roughness equals 20.307 nm.
The optical properties of 2\,7\ dichlorofluorescein thin films of different thickness are studied. Transmittance and reflectance are measured at room temperature, in the wave length range (350–2500 nm), to calculate the optical constants (refractive index n and absorption index k) by Fresnel's equations. The allowed optical transitions were found to be indirect transitions. Analysis of the obtained values of the refractive index yielded the optical high frequency dielectric constant and other optical dispersion parameters , .
The Dc electrical conductivity for 2\,7\ dichlorofluorescein was measured in the temperature range (303-433 K). The electrical resistance was measured as a function of temperature. The obtained results showed that DCF has two values of activation energy and through the considering range of temperature. The first one is the, intermolecular conduction process which result from traveling of the charge carriers from one kind of macromolecule to another which causes lower value for activation energy (region I). The second process is the intramolecular conduction which results from hopping of electrons from one atomic site to another.
Other data
| Title | Study of some transport properties for the compound 2\ 7\ dichlorofluorescein as an organic semiconductor dye. | Other Titles | دراسة بعض الخصائص الانتقالية لمركب٢/ ٧/ داى كلوروفلورسين كصبغه شبة موصلة عضوية. | Authors | Moheb Mourad Micheal Gerges | Issue Date | 2017 |
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