Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
The lifespan of liquid electrolyte based Dye-Sensitized Solar Cells (DSSCs) are usually short due to solvent evaporation, leakage, desorption of weakly adsorbed dyes and corrosion of the platinum electrode. Hence, quasi-solid electrolyte (QSE) has been introduced as an alternative for liquid electrolyte. In this study, the QSEs were prepared by using polyethylene glycol (PEG) with different molecular weights, 4,4’-diphenylmethane diisocyanate (MDI), propylene carbonate (PC), potassium iodide and iodine. The DSSCs were fabricated by using fluorine doped tin oxide coated glass slide (FTO) as substrate, titanium dioxide as semiconductor oxide thin film, blueberry as natural dye, and carbon coated FTO as counter electrode. The performances of the DSSCs such as open circuit photovoltage (Voc), short circuit current density (Jsc), fill factor (FF), energy conversion efficiency (ƞ) and lifespan were obtained by using metal halide lamp (75 Watt) as the light source. Generally, the results showed that the ƞ of DSSCs decreased with the increased of the PEG molecular weight. The addition of MDI at a ratio of 15:1 (PEG:MDI) into the QSE resulted in a doubling of the ƞ of DSSCs compared to without MDI.
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