6533b85bfe1ef96bd12bb52f
RESEARCH PRODUCT
Donor-π-acceptors containing the 10-(1,3-dithiol-2-ylidene)anthracene unit for dye-sensitized solar cells
Robin Humphry-bakerNazario MartínNazario MartínShaik M. ZakeeruddinRafael ViruelaPierre-antoine BouitMichael GrätzelMagdalena MarszalekEnrique OrtíJuan Luis DelgadoJuan Luis Delgadosubject
optical propertiesAbsorption spectroscopypigments010402 general chemistryPhotochemistrydyes01 natural sciences7. Clean energyCatalysischemistry.chemical_compound[CHIM]Chemical SciencesComputingMilieux_MISCELLANEOUSAnthracene010405 organic chemistryOrganic ChemistryDithiolGeneral ChemistryMolar absorptivity0104 chemical sciencesDye-sensitized solar cellchemistryIntramolecular forcesensitizerssolar cellsAbsorption (chemistry)absorptionMolecular tweezersdescription
Two donor-acceptor 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 TiO(2) surface through the two anchoring groups in a unidentate binding form. A power-conversion efficiency of 3.7% was obtained with a volatile CH(3)CN-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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-09-01 |