Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 15, Issue 20, Pages 5130-5137Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200801778
Keywords
electron transfer; mesoporous materials; photochemistry; phthalocyanines; sensitizers; zinc
Categories
Funding
- Spanish MEC [CTQ-2008-00418BQU, CTQ2007-60746/BQU, CONSOLIDER-INGENIO 2010, NANO-CIENCIA MOLECULAR-CSD2007-00010, HOPE-CSD-0007-2007]
- Comunidad de Madrid [S-0505/PPQ/000225]
- EU [1 FP7-ENERGY-2007-1-RTD]
- ESF-MEC [MAT2006-2818-E]
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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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