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Content available Dye-sensitized solar cells using some organic dyes as photosensitizers
El-Agez T. M., Taya S. A., Elrefi K S, Abdel-Latif M S
Optica Applicata
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2014
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Vol. 44, nr 2
345--351
EN
Eight organic dyes are used as sensitizers for dye-sensitized solar cells. These dyes are eosin Y, aniline blue, bromophenol blue, alcian blue, methyl orange, crystal violet, fast green, and carbol fuchsin. The absorption spectra of these dyes are carried out by UV–VIS spectrophotometry. Dye-sensitized solar cells are assembled using nanostructured, mesoporous TiO2 films. Photovoltaic parameters of the fabricated cells are investigated and the highest overall conversion efficiency of 0.399% is obtained for the dye-sensitized solar cell sensitized with eosin Y.
2
Content available remote Dye-sensitized solar cells with natural dyes extracted from plant seeds
El-Ghamri H S, El-Agez T. M., Taya S. A., Abdel-Latif M S, Batniji A Y
Materials Science Poland
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2014
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Vol. 32, No. 4
547--554
EN
The application of natural dyes extracted from plant seeds in the fabrication of dye-sensitized solar cells (DSSCs) has been explored. Ten dyes were extracted from different plant seeds and used as sensitizers for DSSCs. The dyes were characterized using UV-Vis spectrophotometry. DSSCs were prepared using TiO2 and ZnO nanostructured mesoporous films. The highest conversion efficiency of 0.875 % was obtained with an allium cepa (onion) extract-sensitized TiO2 solar cell. The process of TiO2-film sintering was studied and it was found that the sintering procedure significantly affects the response of the cell. The short circuit current of the DSSC was found to be considerably enhanced when the TiO2 semiconducting layer was sintered gradually.
3
Content available remote Theoretical study of slab waveguide optical sensor with left-handed material as a core layer
Taya S. A., El-Agez T. M., Kullab H. M., Abadla M. M., Shabat M. M.
Optica Applicata
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2012
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Vol. 42, nr 1
193-205
EN
A three-layer planar waveguide sensor consisting of thin left-handed material core layer is investigated for sensing applications. The sensitivity of the proposed sensor to the changes in the refractive index of the cladding is presented and studied for TE-polarized light. It is observed that the sensitivity of the proposed sensor is improved compared to that of the conventional three-layer slab waveguide sensor. It is also found that the sensitivity of the structure proposed is negative and critically dependent on the dispersive permittivity and permeability of the core layer.
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