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Effect of Acidic Environment on the Spectral Properties of Hibiscus sabdariffa Organic Dye used in Dye-Sensitized Solar Cells

Authors: Oday A. Hammadi --- Noor I. Naji
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2014 Volume: 10 Issue: 2 Pages: 27-31
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة


In this work, the spectral properties of the Hibiscus sabdariffa organic dye solved in different solvents were studied by introducing the effect of dye concentration on its absorbance and transmission spectra within the range 400-800nm. As well, the effect of adding acid to the dye solution on these properties was introduced. Results showed that the spectral properties of the dye depend substantially on the type of the solvent, which has to be chosen carefully to achieve the optimum properties of this dye to be used as a sunlight sensing organic medium in dye-sensitized solar cells. Also, the results showed that the spectral properties of this dye are noticeably affected by the presence of acid in the solution. Variation of acidic content in the dye solution was studied and its effect on both absorbance and transmittance was studied. As the acidic content in the solution was increased, the absorbance increased while transmittance decreased that may be attributed to dissociation of dye molecules, formation of new different compounds and/or quenching the spectral activity of the Hibiscus sabdariffa dye molecules.

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