الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 249 |  |  |
| | | from | 249 | | |
Abstract
The work carried out on this thesis presented in five main chapters.
The first chapter, is the general introduction, which contains literature survey about the investigated samples and the aim of work.
The second chapter, describes the theoretical and the different calculation methods used for analyzing the results (DC-, AC-conductivity, dielectric constant (a’), dielectric loss (a”), optical parameter (Eg and En), photochemical quantum yield (Qn), fluorescent quantum yield (Of) and photoelectrochemical solar cell parameters.
The third chapter, shows the experimental methods including the preparation of pure PMMA; PMMA-dye samples by casting method; preparation of TiO2 using in preparation of photoelectrochemical solar cell and preparation of photoelectrochemical solar cell based on dye sensitized TiO2. This chapter includes also the techniques used in the investigation of the samples (TG, DTA and IR) and in measuring the electrical, optical properties and solar cell parameters.
The fourth chapter, deals with the thermal stability and the characterization of the investigated samples where the results were reported and discussed.
The fifth chapter, is divided into four parts: The first part deals with the study of DC- and AC-conductivity of pure PMMA and PMMA-dye samples at a temperature range from room temperature to 373 and frequency of (30 — 1000 kHz).
The second part of this chapter is concerned with the electrical studies of the relative permittivity (a’) and the dielectric loss (s”) of the samples under investigation. The measurements were carried out at a temperature rang from room temperature to 373 K and frequency of (30 — 1000 kHz). The third part deals with the study of photostability of pure PMMA and PMMA-dye samples under indoor and outdoor testing, June, July and August (summer 2001), in a wavelength range from 200 — 700-mn. The optical parameters (Es and Es), photochemical quantum yield (Q) and fluorescent quantum yield (Qf) were also calculated and discussed.
The fourth part deals with the study of the effect of chemical structure of different dyes on solar energy efficiencies illuminated under sunlight in 22nd of August in Benha city afternoon. Solar cell parameters including, the open circuit voltage (V(,s), short circuit current asa, the fill factor (FF) and overall energy conversion (ray) were also calculated.