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Issue 47, 2012
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A selective co-sensitization approach to increase photon conversion efficiency and electron lifetime in dye-sensitized solar cells

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Abstract

Ruthenium-based C106 and organic D131 sensitizers have been judicially chosen for co-sensitization due to their complementary absorption properties and different molecular sizes. Co-sensitization yields a higher light-harvesting efficiency as well as better dye coverage to passivate the surface of TiO2. The co-sensitized devices C106 + D131 showed significant enhancement in the performance (η = 11.1%), which is a marked improvement over baseline devices sensitized with either D131 (η = 5.6%) or C106 (η = 9.5%). The improved performance of the co-sensitized cell is attributed to the combined enhancement in the short circuit current, open circuit voltage, and the fill-factor of the solar cells. Jsc is improved because of the complementary absorption spectra and favorable energy level alignments of both dyes; whereas, Voc is improved because of the better surface coverage helping to reduce the recombination and increase the electron life time. The origins of these enhancements have been systematically studied through dye desorption, absorption spectroscopy, and intensity modulated photovoltage spectroscopy investigations.

Graphical abstract: A selective co-sensitization approach to increase photon conversion efficiency and electron lifetime in dye-sensitized solar cells

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Publication details

The article was received on 23 Aug 2012, accepted on 04 Oct 2012 and first published on 04 Oct 2012


Article type: Communication
DOI: 10.1039/C2CP42959D
Citation: Phys. Chem. Chem. Phys., 2012,14, 16182-16186
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    A selective co-sensitization approach to increase photon conversion efficiency and electron lifetime in dye-sensitized solar cells

    L. H. Nguyen, H. K. Mulmudi, D. Sabba, S. A. Kulkarni, S. K. Batabyal, K. Nonomura, M. Grätzel and S. G. Mhaisalkar, Phys. Chem. Chem. Phys., 2012, 14, 16182
    DOI: 10.1039/C2CP42959D

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