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العنوان
Study of some physical properties of organic dye thin films and photovoltaic application /
المؤلف
Mohamed, Lamiaa Mahmoud Diaa El-Deen.
هيئة الاعداد
باحث / لمياء محمود ضياء الدين محمد
مشرف / عطية عبد المطلب عطية
مشرف / ايناس عبد الفتاح الشاذلى
مشرف / أمل محمد عبد البارى
تاريخ النشر
2019.
عدد الصفحات
159 p. :
اللغة
الإنجليزية
الدرجة
ماجستير
التخصص
الفيزياء والفلك (المتنوعة)
تاريخ الإجازة
1/1/2019
مكان الإجازة
جامعة عين شمس - كلية التربية - فيزياء الجوامد المساعد
الفهرس
Only 14 pages are availabe for public view

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Abstract

This thesis represents an experimental study for physical properties of organic dye. This thesis consists of five chapters, conclusion and list of references.
The thesis begins with a short theoretical background about the field of organic semiconductors, Electronic structure of organic semiconductors, Absorption process and finally the theory of organic photovoltaic solar cell.
Then it represented a brief overview of the experimental techniques used in this thesis. It describes the basic of the conventional thermal evaporation (vacuum deposition) techniques, the configuration of the sample preparation, the film thickness measurement methods , the techniques that used to determine the molecular structure, i.e. X-ray diffraction pattern (XRD), Scanning electron microscope and Fourier transform infrared spectroscopy (FT-IR) Techniques, the techniques that used to determine the optical properties usually the Spectrophotometric measurement of transmittance (T) and reflectance (R) at normal incidence light, the cyclic voltammetry technique, the technique used to determine the value of the HOMO-LUMO gap, current-voltage (I-V) measurement and capacitance-voltage (C-V) measurement.
X-ray diffraction results indicate that powder of the investigated compound has a polycrystalline nature with a triclinic structure. The morphology for the as-deposited MnTPPCl depicts that average particle size increases from 50nm in as-deposited films to 0.91μm in films annealed at 473K, while in films affected by temperature at 523K, the particle size reaches up to 1.954μm. FT-IR indicates that the material has thermal and chemical stability.
We also represent the optical properties of 5,10,15,20 tetra phenyl porphine manganese (III) chloride: transmittance (T), reflectance (R), optical constants (n, k), absorption coefficient (α), molar extinction coefficient (εmolar) , oscillator strength(f), electric dipole strength (q2), HOMO-LUMO gap, single oscillator energy (Eₒ), dispersion energy (Ed) and electric constant (εL).The values of the HOMO-LUMO gap is calculated using an optical method and cyclic voltammetry technique. The type of the optical transition responsible for the optical absorption is direct allowed transition. The refractive index showed an anomalous dispersion in the absorption region as well as a normal one in the transparent region. Some dispersion parameters, the real and imaginary parts of dielectric constant (ε1,ε2), volume and surface energy loss functions (VELF and SELF) and real and imaginary parts of optical conductivity (σ1,σ2) of MnTPPCl films are determined.
Finally the thesis represents the electrical properties of tetra phenyl porphine manganese (III) chloride thin film by studying the dark and illumination (I-V) characterization of Au/MnTPPCl/p-Si/Al hetero junction. The transport mechanism of the electronic charges is determined for the hetero junction in the forward direction in Au/MnTPPCl/p-Si/Al hetero junction. Results showed that the R.R was about 15.717 for room temperature. The determined values of Rs and Rsh are found to be 40.152 KΩ and 2.26 MΩ, respectively. At low forward voltages the transport mechanism is thermionic emission mechanism and at high voltage is space-charge limited conduction (SCLC) mechanism. The junction shows a photovoltaic behavior with a maximum open-circuit voltage, Voc of 0.5029 V, a short-circuit current Isc 4.2818×〖10〗^(-7) A and fill factor equals 0.15.