Phthalocyanines: colorful macroheterocyclic sensitizers for dye-sensitized solar cells |
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Authors: | M Victoria Martínez-Díaz Mine Ince and Tomás Torres |
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Institution: | (1) Department of Organic Chemistry, University Autonoma of Madrid, 28049 Madrid, Spain |
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Abstract: | Abstract Dye-sensitized solar cells (DSSCs) have gained great attention as lower-cost alternatives to conventional photovoltaic devices.
One way to improve the excellent efficiencies (ca. 11%) exhibited by DSSCs based on ruthenium polypyridyl dyes would consist
in using sensitizers with enhanced light-harvesting properties in the red region of the spectrum. Phthalocyanines (Pcs) are
very robust molecules which present extraordinary high extinction coefficients in the 600- to 700-nm spectral region. Intensive
research has been focused on reducing the undesired aggregation phenomena of Pcs on the metal oxide surface, while keeping
a good electronic coupling between the LUMO of the Pcs and the TiO2 conduction band, and a good solubility of the dye in organic solvents. Recently, unsymmetrically substituted “push–pull”
Pcs have emerged as efficient red-absorbing dyes, reaching power conversion efficiencies of up to 4.7%, when used as single
sensitizers. |
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