Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 172, Issue 1, Pages 63-71Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2004.11.005
Keywords
dye sensitization; solar cells; squaraine dyes; aggregation; nanocrystalline TiO2
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A series of novel symmetrical and unsymmetrical squaraine dyes have been synthesized and their comparative efficiencies as photosensitizers in dye sensitized solar cells (DSSCs) containing nanocrystalline TiO2 photoelectrodes have been investigated. DSSCs employing unsymmetrical squaraines as sensitizers produced photocurrent with much higher efficiencies compared to DSSCs containing symmetrical squaraines. Aggregation of the dyes on the TiO2 nanocrystalline electrode was observed to adversely affect the sensitization properties of symmetrical squaraines, whereas efficient sensitization was observed from both the monomeric and aggregated forms of the unsymmetrical squarames. (c) 2004 Elsevier B.V. All rights reserved.
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