Tandem Dye-sensitized Solar Cells for Energy Conversion and Storage

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Elizabeth Gibson
Tandem Dye -sensitized Solar Cells for Energy Conversion and Storage One way of improving the efficiency of dye -sensitized solar cells is to use two pho toelectrodes in a tandem device, one harvesting the high energy photons, and the other harvesting the low energy photons. 1 This enables the photovoltage to be increased, whilst maximizing light harvesting across the solar spectrum. Despite their promise, a tandem cell with a higher efficiency than the state -of-the -art “Grätzel” cell has not yet been achieved. This is because t he performances of photocathodes are significantly lower than TiO 2-based anodes, and the p -type concept has been largely unexplored since the first device was prepared in 1999. 2 The small potential difference between the valence band of the NiO, p -type sem iconductor, and the redox potential of the electrolyte and the faster charge -recombination reactions compared to the TiO 2 system limits the efficiency. In recent years we have made progress by developing new photosensitizers. 3 In parallel we have investiga ted the charge -transfer processes to determine the mechanism and limitations to efficiency. 4 This has increased our understanding of the redox processes at the dye/electrolyte and NiO/electrolyte interfaces. 5 The fundamental limitation of these devices ari ses from the NiO material itself and we have re -focussed our efforts on finding a replacement transparent p -type semiconductor. Our strategy and recent results will be presented. Recent work to expand the applications to photoelectrochemical water splittin g for energy storage will be described , briefly. 6
[1] E. A. Gibson, A. L. Smeigh, L. Le Pleux, L.Hammarström, F. Odobel, G. Boschloo, A. Hagfeldt. , Angew. Chem. Int. Ed. 2009 , 48 , 4402 –4405. [2] J . He, H. Lindström, A. Hagfeldt, S. Lindquist, J. Phys. Chem. B, 1999 , 103 , 8940 –8943. [3] C . J. Wood, G . H. Summers, E . A. Gibson . Chem. Commun. 2015 , 51 , 3915 – 3918 . [4] J. -F.Lefebvre, X. -Z. Sun, J. A. Calladine, M. W. George, E. A. Gibson. 2014 , 50 , 5258 – 5260. G. Boschloo, E. A. Gibson, A . Hagfeldt J. Phys. Chem. Lett ., 2011 , 2, 3016 –302. E. A. Gibson , L. Le Pleux, J. Fortage, Y . Pellegrin, E . Blart, F . Odobel, A . Hagfeldt, G . Boschloo, Langmuir 2012, 28 , 6485 –6493 [5 ] F. A. Black, C. J. Wood, S . Ngwerume, G. H. Summers, I. P. Clark, M. Towr ie, Jason E. Camp, E. A. Gibson, Faraday Discussions , 2017 , 198, 449 – 461. L. D'Amario, R. Jiang, U. Cappel, E. A. Gibson, G. Boschloo, H. Rensmo, L. Sun, L. Hammarström, H. Tian*, ACS Appl. Mate r. Interfaces. 2017 , 9, 33470 –33477. [6] E. A. Gibson, Chem . Soc . Rev ., 2017 , 46 , 6194 – 6209 . N. Põldme, L. O’Reilly, I. Fletcher, I. Sazanovich, M. Towrie, C. Long, J. G. Vos, M. T. Pryce, E. A. Gibson Chem. Sci. In press.
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  • Venue

    Theatre C, Purdie

  • Date

    October 3, 2018

  • Time

    From: 15h30 To: 16h30

  • Sponsor

    University of St Andrews
    The oldest university in Scotland, with international renown for both research and education of undergraduates and postgraduates.

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