Effects of Phenylalkanoic Acids as Co-Adsorbents on the Performance of Dye-Sensitized Solar Cells
The photoelectrochemical effects of a series of phenylalkanoic acids as co-adsorbents along with a ruthenium sensitizer, cis-diisothiocyanato-bis(2,2′-bipyridyl-4,4′-dicarboxylato) ruthenium(II) bistetrabutylammonium dye (N719), were investigated in dye-sensitized solar cells (DSSCs). All the co-adsorbents used in this study enhanced the short circuit current density (J sc) resulting from the increased electron injection efficiency due to the significant reduction of dye-aggregation, and this enhancement increased with increasing chain-length of their hydrophobic alkyl groups. They suppressed interfacial back electron transfer rate from the conduction band of TiO2 to triiodide (I − 3) in electrolyte without shifting the quasi-Fermi level of the TiO2 in general, and induced a longer recombination lifetime (τr). This corresponded to the enhancement of the open circuit voltage (V oc) of the cells by up to ca. 20 mV compared to that with no co-adsorbents. On the contrary, the photovoltage decreased by ca. 10 mV when 2-phenylethanoic acid was used as a co-adsorbent, which was attributed to the negative shift of the quasi-Fermi level of the TiO2 nanoparticles.
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Document Type: Research Article
Publication date: December 1, 2013
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