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المتحسسات الطبيعية للخلايا الشمسية ذات الصبغات المتحسسة على قواعد اوكسيد الخارصين == Natural Sensitizer for Dye - Sensitized Solar Cells Based on Zinc Oxide
Author name:
اوراس طارق شاكر
Supervisor name:
صلاح عبد الله حسون | رعد محمد صالح الحداد
General topic:
Physics
Specific topic:
Solid State and Materials Physics
Degree:
Master
University:
University of Baghdad - College Of Science For Girls - Physics Department
Language:
English
University location:
Baghdad
First pages:
26T1795 - p.pdf
Abstract:
This thesis focused on the study of dye - sensitized solar cells (DSSCs) based on ZnO nanoparticle as a semiconducting layer with two natural dyes.The present study began by synthesizing ZnO nanoparticles by two methods. The first method ZnO nanoparticles prepared by sol - gel method with (0.1, 0.2, 0.3 M) zinc acetate and then thin films of zinc oxide prepared by using spin coating technique with thickness equal to (109 nm), while the second method technique of ZnO nanoparticles prepared by sol gel method (0.2 M) from zinc acetate was selected as the optimum concentration to make thin film of zinc oxide (In the form of a paste) by using doctor - blade technique with thickness equal to (111nm).The effective mass model for spherical particles (Brus equation) for ZnO nanoparticles were (1.3147, 1.4056, 1.6379 nm) for three concentration.The characteristic of the prepared films on glass substrates have been examined by X - ray diffraction analysis (XRD), UV - Vis spectroscopy, photoluminescence spectrum (PL), scanning electron microscopy (SEM), Atomic Force Microscope (AFM) and Thermo Graviometric Analysis (TGA).In both methods , ZnO films were prepared on transparent conducting oxide (ITO) coated glass then addition of chlorophyll as sensitized dye which extracted from spinach leaves and anthocayanin pigment from pomegrenate juice and they were used as the working electrode (anode) of dye - sensitized solar cell (DSSCs).The absorption spectra of all dyes were performed by UV - Visible spectroscopy which showed that the dye absorbed light in the visible region from (400 nm) for chlorophyll pigment and (510 nm) for anthocyanenpigment.The (I - V) characteristic curves of the fabricated tow cells were measured and studied at constant light intensity. All photovoltaic parameters of the cells were presented. The results revealed that the extract of Pomegranate by using spin coating lead to the highest efficiency (15%).
