Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Dye-sensitized nanocrystalline TiO2 solar cells (DSCs) have recently been under intense investigation because of their high efficiency and potential for low-cost production [1]. There has been an increasing interest in ruthenium (II) polypyridine charge transfer complexes for dye sensitized nanocrystalline TiO2 solar cell. A high efficiency of 11.6% in dye-sensitized solar cell was obtained by design and syntheses of donor–acceptor type coadsorbents which effectively overcome the competitive light absorption by I-/I3-, avoid dye aggregation, and reduce the charge recombination [2,3]. Molecular design of ruthenium (II) polypyridyl photosensitizers that can absorbs visible light of all colors presents a challenging task. We have tune the HOMO-LUMO energy level of ruthenium polypyridyl complexes and an optimal threshold value of 1.45 eV was estimated for maximum power conversion. Recently we have developed a new series of panchromatic sensitizers based on ruthenium(II) polypyridine and organic sensit-izers, when anchored to nanocrystalline TiO2 films, efficiently sensitized the TiO2 over the whole visible extending to the near infrared region (350 nm to 1000 nm) [4].
IPCE spectra of DSCs based on Black-dye (BD) and dye cocktails of BD and small size molecules of organic dyes HC3, HC4, and HC5, respectively.
[1] O’Regan, B.; Grätzel, M. Nature, 353, 737 (1991).
[2] L. Han, A. Islam, et al., Energy Environ. Sci., 2012, 5, 6057-6060.
[3] S. Zhang, A. Islam, and L. Han, et al., J. Mater. Chem. A, 2013, 1, 4812-4819.
[4] A. El-Shafei, A. Islam et al., J. Mater. Chem., 2012, 22, 24048–24056
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