Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Four systems of porphyrin and diporphyrin dyes with a push-pull framework have been prepared and used in dye-sensitized solar cells (DSSC). Their spectral, electrochemical and photovoltaic properties were investigated. The absorption bands of these porphyrin dyes are broadened and red-shifted upon introduction of electron-donating groups (push unit) to the meso-positions and/or of p-extended linkers (pull unit). The photovoltaic measurements show that YD2-o-C8 achieves a record power conversion efficiency ~12% using Co(II)/Co(III) as the electrolyte. When YD2-o-C8 is co-sensitized with an organic dye Y123, the device gives a power conversion efficiency of 12.3% under standard AM 1.5 sunlight, and 13.1% under AM 1.5 solar light of 500 W m−2 intensity. In YD2-o-C8, The hydrophobic alkoxyl chains at the ortho-positions of the meso-phenyls suppress molecular aggregation and successfully block the approach of the electrolyte to the surface of TiO2 to reduce charge recombination, giving an improved Voc and the power conversion efficiency. Based on the structure of YD2-o-C8, a new porphyrin GY50 with more red-shifted absorption has been synthesized. The device of GY50 gives a power conversion efficiency of 12.75% under standard AM 1.5 sunlight. Introduction of push and pull units to meso-positions is demonstrated to be achievable, and these push-pull porphyrin dyes are promising candidates for highly efficient DSSC.
1.Yella, A.; Mai, C.-L.; Zakeeruddin, S. M.; Chang, S.-N.; Hsieh, C.-H.; Yeh, C.-Y.;Graetzel, M. Angew. Chem. 2014, DOI:10.1002/ange.201309343. 2. Yella, A.; Lee, H.-W.; Tsao, H. N.; Yi, C.; Chandiran, A. K.; Nazeeruddin, M.; Diau, E. W.-G.; Yeh, C.-Y.; Zakeeruddin, S. M.; Graetzel, M., Science, 2011, 334, 629-634.
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