Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 207, Issue 2-3, Pages 224-230Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2009.07.014
Keywords
Dye-sensitized solar cell; Gel polymer electrolyte; TiO2 morphology; Organic iodide; Electrochemical impedance spectroscopic
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Funding
- Academia Sinica, Taipei, Taiwan, the Republic of China [AS-97-TP-A08]
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Quasi-solid-state dye-sensitized solar cells (DSSCs) with different weight ratios of polyvinyidene fluoride-co-hexafluoro propylene (PVDF-HFP) containing two different plasticizers such as propylene carbonate (PC) and acetonitrile (AN) were fabricated and the effects of TiO2 morphology, light intensities as well as different organic iodides on the solar cell performance were studied. Two TiO2 photoelectrodes were designed by the coating of low (PI) and high molecular weight poly(ethylene glycol)(P2) incorporated into the TiO2 suspension. The DSSCs fabricated with the P2 TiO2 electrode show better performance in terms of short-circuit current densities (J(SC)) and conversion efficiencies than the P1 for all the weight percentages of PVDF-HFP containing both plasticizers. Further, the maximum current density ((J(SC)) and conversion efficiency of PVDF-HFP containing different organic iodides follow the order: TBAI > TPAI > NH4I irrespective of the solvents and light intensity. A good conversion efficiency of 6.74% with J(SC) of 16.04 mA/cm(2), an open-circuit voltage (V-OC) of 0.657V and a fill factor of 0.64 under illumination of 100 mW/cm(2) was obtained for the DSSC with 10% of PVDF-HFP containing 0.4 M of TBAI and 0.04 M of I-2 in PVDF-HFP/AN system. (C) 2009 Elsevier B.V. All rights reserved.
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