期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 18, 期 37, 页码 11621-11629出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201201022
关键词
absorption; dyes; pigments; optical properties; sensitizers; solar cells
资金
- MINECO of Spain [TQ2011-27934, CTQ2011-24652, CTQ2009-08790/BQU, CSD2007-00010]
- Comunidad de Madrid [MADRISOLAR-2, S2009/PPQ-1533]
- Generalitat Valenciana [PROMETEO/2012/053]
- EU project [FUNMOLS FP7-212942-1]
- IMDEA-Nanociencia
Two donoracceptor molecular tweezers incorporating the 10-(1,3-dithiol-2-ylidene)anthracene unit as donor group and two cyanoacrylic units as accepting/anchoring groups are reported as metal-free sensitizers for dye-sensitized solar cells. By changing the phenyl spacer with 3,4-ethylenedioxythiophene (EDOT) units, the absorption spectrum of the sensitizer is red-shifted with a corresponding increase in the molar absorptivity. Density functional calculations confirmed the intramolecular charge-transfer nature of the lowest-energy absorption bands. The new dyes are highly distorted from planarity and are bound to the TiO2 surface through the two anchoring groups in a unidentate binding form. A power-conversion efficiency of 3.7?% was obtained with a volatile CH3CN-based electrolyte, under air mass 1.5 global sunlight. Photovoltage decay transients and ATR-FTIR measurements allowed us to understand the photovoltaic performance, as well as the surface binding, of these new sensitizers.
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