Souad A. Mohamad

Photovoltaic properties of semiconductor (ZnSe)/polymer (PEO-Chitosan blend) junction for solar cells applications

The properties of ZnSe/PEO junction photoelectrochemical cells have been studied under dark and illuminated conditions. ZnSe was electrodeposited onto an indium tin oxide (ITO) glass and the polymer film of PEO-chitosan: NH4I (+I2) was placed over it followed by another ITO glass. The polymer film was prepared by the solution cast technique. The open circuit voltage (Voc) of the fabricated cells was between 300 mV to 400 mV. In the dark the device operates as a diode while under illumination it operates as a photoelectrochemical cell.

Optical, thermal and dielectric studies of silver-silica nanoparticles synthesized via sol-gel technique

Silver-silica nanocomposites (Ag-SiO2NCs) with various compositions were synthesized through sol-gel technique. The morphology, optical and thermal stability of the nanocomposite were investigated and was compared with pure sol-gel to determine the effects of the nanoparticles. Transmission electron microscopy (TEM) confirmed that SiO2 was encapsulated Ag with mean size of 30 nm. Uv-vis spectroscopy shows that the surface plasmon resonance (SPR) peak show Ag-SiO2 NCs were greatly reduce due to the SiO2 particles. The permittivity and refractive index were decreased as the composition of Ag was increased at composition of 60% silver. The real permittivity is negative along the visible region. The trend stability of Ag-SiO2NCs were increased with the increased amount of silver.

Controlled Potential Electrodeposition and Characterization of ZnTe Thin Films on Indium Tin Oxides

Electrodeposition of ZnTe thin films by controlled potential method from aqueous solutions on ITO were done to investigate characteristics suitable as a window material in solar cells technology. The influence deposition of potential towards the Zn:Te ratio and the crystallinity are discussed. The electrodeposited films were investigated by using X-Ray Diffraction and Energy Dispersive Analysis of X-Ray. The Te content decreases at higher deposition potentials.

Structure characterization of electrodeposited zinc selenide thin films

Crystalline thin of zinc selenide have been electrochemically deposited on conducting substrates of indium tin oxide, ITO glass. Initial investigation with voltammetry was done and shows that the zinc selenide films were stable towards oxidation. The best deposition potential obtained was at -0.95 V vs. Ag /AgCl while at lower deposition potentials, the films do not form well. Energy Dispersive Analysis and X-Ray spectrum indicate that the films deposited at 65oC and -0.95 V vs. Ag/AgCl have nearly stoichiometric Zn: Se ratio.