Main Page
Library Polices
Library rules and regulations
General Policy of the library
Policy and Instructions for Special Groups
Policy and Instructions of Loan services
Policy and instructions for the Reference Service
Policy and instructions for Electronic Services
Policy and Instructions for Periodicals
Policy and Instructions for Programs and Activitie
Policy and Instructions for Donations
General information
Brief History
Organizational structure
Management and departments
Administration Affairs
Department of special groups
Digital Libraries
Digital Library at King Abdulaziz University
Saudi Digital Library
DL+
PhotoAlbum
Awards
Latest News
Files
FAQ
Researches
عربي
English
About
Admission
Academic
Research and Innovations
University Life
E-Services
Search
Vice Deanship of Library Affairs - Girls Campus
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 Type
Dr Grade
Email
شوق محمد الغامدي
AL-Ghamdi, Shoug Mohammad
Researcher
Master
Files
File Name
Type
Description
36209.pdf
pdf
Back To Researches Page