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Structure-Function Relationships in Unsymmetrical Zinc Phthalocyanines for Dye-Sensitized Solar Cells

Authors
  • Cid, Juan-Jose
  • Garcia-Iglesias, Miguel
  • Yum, Jun-Ho
  • Forneli, Amparo
  • Albero, Josep
  • Martinez-Ferrero, Eugenia
  • Vazquez, Purificacion
  • Graetzel, Michael
  • Nazeeruddin, Mohammad K.
  • Palomares, Emilio
  • Torres, Tomas
Publication Date
Jan 01, 2009
Source
Infoscience @ EPFL
Keywords
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Abstract

A series of unsymmetrical zinc phthalocyanines bearing an anchoring carboxylic function linked to the phthalocyanine ring through different spacers were designed for dye-sensitised solar cells (DSSC). The modification of the spacer group allows not only a variable distance between the dye and the nanocrystalline TiO2, but also a distinct orientation of the phthalocyanine on the semiconductor surface. The photovoltaic data show that the nature of the spacer group plays a significant role in the electron injection from the photo-excited dye into the nanocrystalline TiO2 semiconductor, the recombination rates and the efficiency of the cells. The incident monochromatic photon-to-current conversion efficiency (IPCE) for phthalocyanines bearing an insulating spacer is as low as 9%, whereas for those with a conducting spacer an outstanding IPCE 80% was obtained.

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