Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
The development of dyes that exhibit a broad absorption band from the visible to the near-infrared (NIR) region is crucial in order to harvest sunlight efficiently in dye-sensitized solar cells (DSSCs). We have carried out several studies for NIR sensitizer, such as ruthenium sensitizer DX1 [1] and osmium sensitizer [2], which exhibits the spin-forbidden singlet-to-triplet direct transition in NIR region. Here, we report photophysical properties of novel phosphine-coordinated ruthenium sensitizers (DX2, DX3) that exploit broadband sunlight. As a result of the optimization of the ligand field strength of the phosphine ligand on the dyes, absorption spectra of the sensitizers shifted to the longer wavelength, the DSSC employing DX3 generated a photocurrent density of >30 mAcm-2. This result shows the highest value for DSSCs reported to date, but also it is suitable for tandem-type solar cells. Tandem-type solar cell is a multiple-layered solar cell to decrease thermal- and optical-energy losses. However, it has been difficult to apply tandem-method in DSSCs because there are no appropriate dyes with high performance in NIR area. In the present study, a tandem-type DSSC employing both DX3 and the traditional sensitizer N719 were shown to have a power conversion efficiency of >14%.
Photograph of NIR sensitizer (DX1) adsorbed on TiO2 electrodes printed on FTO substrates.
[1] Kinoshita, T., Dy, J. T., Uchida, S., Kubo, T., Segawa, H. Wideband Dye-Sensitized Solar Cells Employing A Phosphine-Coordinated Ruthenium Sensitizer. Nature Photonics 2013, 7, 535-539. [2] Kinoshita, T., Fujisawa, J., Nakazaki, J., Uchida, S., Kubo, T., Segawa, H. Enhancement of Near-IR Photoelectric Conversion in Dye-Sensitized Solar Cells Using an Osmium Sensitizer with Strong Spin-forbidden Transition. J. Phys. Chem. Lett. 2012, 3, 394-398.
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