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A Selective Co-Sensitization Approach to Increase Photon Conversion Efficiency and Electron Lifetime in Dye-Sensitized Solar Cells

A Selective Co-Sensitization Approach to Increase Photon Conversion Efficiency and Electron Lifetime in Dye-Sensitized Solar Cells

Loc H Nguyen, Hemant K Mulmudi, Dharani Sabba, Sneha A Kulkarni, Sudip K Batabyal, Kazuteru Nonomura, Michael Grätzel, Subodh G Mhaisalkar

Phys Chem Chem Phys. 2012 Dec 21;14(47):16182-6.

PMID: 23090062

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 TiO(2). 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. J(sc) is improved because of the complementary absorption spectra and favorable energy level alignments of both dyes; whereas, V(oc) 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.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP1152310694	C106 Dye		1152310-69-4	Price
LS77408	D131 dye			Price

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