الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
 |  | from | 141 |  |  |
| | | from | 141 | | |
Abstract
”This work aimed to improve the physical properties of nanostructured materials for sustainable applications such as solar cells and energy-stored applications. So, this study was divided into two parts : In the first part, corona poling was applied to the zinc oxide (ZnO) thin film as a layer of organic solar cell to enhance its surface morphology and improve the efficiency of the solar cell device. Corona poling effects on optical and structural characteristics of ZnO thin films prepared by sol-gel spin coating technique were investigated. An atomic force microscope study showed the formation of pyramidal grains structure on the Corona-treated surface. The green-yellow photoluminescence peak centered at 2.36 eV which correlated to the anti-site’s oxygen OZn defect, was found to decrease. X-ray diffraction patterns demonstrated that the Corona treatment enhanced the polycrystalline nature and increased the grain sizes of the ZnO thin films, which was also beneficial for electron transport. The role of the surface roughness of the ZnO thin film as an electron transport layer in determining the photovoltaic effect of the inverted solar cells (ISCs) was examined by fabricating ISCs based on P3HT/PCBM. The power conversion efficiency (PCE) obtained from these fabricated ISCs increased from 3.05 to 3.34%. In the second part, the effect of NiO nanoparticles (NPs) embedded in different content with a polymer blend was studied to enhance the nanocomposite’s physical properties for energy storage applications.
So, NiO NPs were prepared using the precipitated method and annealed at 723 K. The obtained NiO and annealed NiO NPs TEM images showed the formation of rods and cubic structures with average crystal sizes of about 9.97 and 21 nm, respectively. The annealed NiO NPs showed enhanced physical properties compared with that of NiO NPs without annealing. So, the annealed NiO NPs were used as a nanofiller mixed with the studied polymer blend at the next work step. Nanocomposite films were prepared by solution-casting, different concentrations of annealed NiO NPs mixed with a blend of polyvinyl alcohol (PVA), polyvinyl pyrrolidone (PVP), and poly(3,4-ethylenedioxythiophene): poly(styrene sulfonic acid) (PEDOT:PSS). More NiO NPs significantly altered the samples’ optical bandgap energies and the crystallinity of nanocomposites. Over a wide frequency range, 10-1 to 107 Hz, the samples’ electrical conductivity, impedance, and dielectric properties were measured. Increasing NiO NPs content resulted in improved AC conductivity, dielectric permittivity, and dielectric loss. By using the impedance components Z′ and Z′′, the equivalent electrical circuit could be experimented suggesting that the PVA/PVP/PEDOT:PSS/NiO nanocomposite is a promising material for optoelectronic and energy storage applications.”