Document Details

Document Type : Thesis 
Document Title :
Study of Some Physical Properties of Organic Material Tetracyanoquinodimethane (TCNQ)
دراسة بعض الخواص الفيزيائية للمركب العضوي رباعي سيانو كينو ثنائي الميثان
 
Subject : Physics 
Document Language : Arabic 
Abstract : Tertracyanoquinodimethan (TCNQ) thin films have been prepared by the thermal evaporation technique. The TCNQ powder showed a polycrystalline nature with a monoclinic structure while as-deposited and annealed films exhibited a preferred orientation of growth. Miller indices, hkl, values for each diffraction peak in XRD spectrum were calculated. The particle crystallite sizes of the films were determined from the XRD spectrum and scanning electron microscope. Optical properties of TCNQ thin films were characterized by using spectrophotometric measurements of transmittance, T, and reflectance, R, in the spectral range (200-2500)nm from which the absorption coefficient and the refractive index for as-deposited and annealed films were calculated. The analysis of the spectral behavior of the absorption coefficient allowed calculating the value of the optical band gap and the type of inter-band transitions. Besides, the extinction molar coefficient was calculated and was used to determine the oscillator strength and the electric dipole strength for the films. The data of the refractive index were analyzed to determine some parameters namely; the oscillator energy, dispersion energy, dielectric constant at high frequency and the lattice dielectric constant. The temperature dependence of the electrical resistivity of Au/TCNQ/Au device in planar structure was studied and showed a semiconductor behavior. TCNQ thin films were deposited on p-GaAs single crystal substrate; the current-voltage and capacitance-voltage characteristics for TCNQ/p-GaAs junction sandwiched between two gold electrodes were investigated. The diode parameters such as ideality factor and barrier height were evaluated. The capacitance-voltage measurements showed that the formed junction is abrupt in its nature and the built-in potential was determined. Under illumination, the cell exhibits photovoltaic characteristics from which the photovoltaic parameters such as open circuit voltage, short circuit current, fill factor and conversion efficiency were calculated. 
Supervisor : Huda Shehata Sulaiman 
Thesis Type : Master Thesis 
Publishing Year : 1430 AH
2009 AD 
Co-Supervisor : Adel Faidah 
Added Date : Wednesday, October 30, 2013 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
شوق محمد الغامديAL-Ghamdi, Shoug MohammadResearcherMaster 

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