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Novel organic dyes incorporating a carbazole or dendritic 3,6-diiodocarbazole unit for efficient dye-sensitized solar cells

Authors
Journal
Dyes and Pigments
0143-7208
Publisher
Elsevier
Volume
100
Identifiers
DOI: 10.1016/j.dyepig.2013.09.025
Keywords
  • Organic Dye
  • Carbazole
  • Dendritic 3
  • 6-Diiodocarbazole
  • Thiophene
  • Dye-Sensitized Solar Cells
  • Photovoltaic Performance

Abstract

Abstract Four organic photosensitizers incorporating a carbazole or 3,6-diiodocarbazole unit as the electron donor, a benzene/thiophene or oligothiophene moiety as the conjugated spacer, and 2-cyanoacrylic acid as the electron acceptor have been synthesized. The photovoltaic performance data are quite sensitive to the structural modification of sensitizer. The introduction of the benzene/thiophene linker benefits from lower tendency to aggregate, but disfavors the electron transport between donor and acceptor. The addition of a thiophene unit in the bridge efficiently red-shifts the absorption response, however, organic dyes have some π–π aggregation. Incorporation of 3,6-diiodocarbazole as a dendritic donor unit not only enhances the molar extinction coefficients of the absorption but also suppresses the charge recombination with electrolyte.

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