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Thin films of cadmium oxide CdO nanoparticles were prepared on glass substrates using pulse laser deposition technique (PLD). N:YAG laser is used with different laser energies (400,500,600,700)mJ, number of shots=100, when preparing all the thin films. The structure and optical characteristics were studied for these films. X-ray diffraction (XRD) results showed that all the prepared thin films were of a polycrystalline type and that the high and dominant crystalline levels were (111) at the angle (2θ =32.986). AFM results demonstrated a grain size of deposited films increase from (50.63-85)nm with laser energy from 400 to 700mJ. Also the absorbance spectrum increases from (0.53-1.45) with increasing laser energy, while the transmittance spectrum decreases with increasing laser energy of all prepared models so that transmittance is (26.53%) at the laser deposit energy (400mJ) until it becomes (1.70%) at the laser deposit energy (700mJ) and at the wavelength (550nm), as for the energy gap it decreases with increasing laser deposit energy and ranges from (2.3-2.5)eV.

Obtained the highest competence and finding the best combination of thickness and concentricity of multilayer solar cells is one the most prominent problems in the field of photovoltaic energy. In this research AlGaAs/GaAs solar cell with four layers of window layer, emitter layer, absorber layer and back surface layer. Is modeled in PC1D emulation software. The performance of the solar cell was studied by changeful the thickness and doping concentration of the window layer from the range (0-1)μm, (1015-1020) respectively. Where the best efficiency was 31.2% at thickness and doping 1015cm-3. Where changing the thickness and doping concentricity of the absorber layer from the range (0-5)μm, (1015-1020) respectively. The highest efficiency was 31.4581% at thickness 3.67μm and doping is 1015cm-3. The results of the final solar cell parameters were Isc, Voc, F.F and η has been observed as 31.8mA, 1.109 V, 89.32% and 31.4581% respectively.