Anatase TiO2 surface exposing (001) and (101) face as a photoanode material for dye-sensitized solar cell

Marketa Zukalova^a, Barbora Laskova^a, Ladislav Kavan^a, Paul Liska^b, Michael Graetzel^b, Jacques Moser^c

^aJ. Heyrovsky Institute of Physical Chemistry, AS CR, Dolejskova 3, Prague, 18223, Czech Republic

^bLaboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Switzerland, Station 6, CH-1015 Lausanne, Lausanne, Switzerland

^cEcole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland

International Conference on Hybrid and Organic Photovoltaics
Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)

Ecublens, Switzerland, 2014 May 11th - 14th

Organizers: Michael Graetzel and Mohammad Nazeeruddin

Poster, Marketa Zukalova, 234
Publication date: 1st March 2014

Dye-sensitized solar cell (DSC) is one of the most promising photovoltaic technologies for production of renewable, clean, and affordable energy. Since its invention by Graetzel et al. in 1985 [1]it has been permanent subject of interest of research teams all over the world. One of the key issues in optimization of the Graetzel cells consists in the morphological engineering of the TiO2 photoanode. High surface area and crystallinity predetermine nanocrystalline TiO2 to work effectively as photoanode in DSC[2]. An anisotropy of electrochemical properties of anatase in the (101) or (001) orientations was observed both for large single-crystal electrodes[3]and for nanocrystalline anatase[4]. An enhanced Liinsertion activityof (001)-oriented anataseas compared to (101)-oriented one is obviously the result of synergic contributions of faster interfacial charge transfer and facile Li transport within a more open structure of the anatase lattice. Since material and structural requirements for both Li insertion electrode and DSC photoanode are similar and charge transport in the anatase skeleton controls the overall efficiency of both processes, the performance of “reactive” (001)-oriented anatase photoanode in DSC was examined[5]. Although the (001) face adsorbed a smaller amount of the used dye sensitizer (C101), it provided a larger open-circuit voltage of the solar cell. In addition to this transient absorption spectroscopy proved slower charge recombination rate for (001)-oriented anatase surface sensitized with C101 dye in pure methoxypropionitrile solvent, which is fully in agreement in theoretical first principles investigation[6].

Acknowledgment. Financial support of the Grant Agency of the Czech Republic (P108/12/0814) is gratefully acknowledged.

References [1] J. Desilvestro, M. Grätzel, L. Kavan, J. Moser, J. Augustynski, J.Am.Chem.Soc. 107 (1985) 2988-2990. [2] L. Kavan, Chemical Record 12 (2012) 131-142. [3] R. Hengerer, L. Kavan, P. Krtil, M. Grätzel, J.Electrochem.Soc. 147 (2000) 1467-1472. [4] M. Bousa, B. Laskova, M. Zukalova, J. Prochazka, A. Chou, L. Kavan, J.Electrochem.Soc. 157 (2010) A1108-A1112. [5] B. Laskova, M. Zukalova, L. Kavan, A. Chou, P. Liska, Z. Wei, L. Bin, P. Kubat, E. Ghadiri, J.E. Moser, M. Gratzel, Journal of Solid State Electrochemistry 16 (2012) 2993-3001. [6] F. De Angelis, G. Vitillaro, L. Kavan, M.K. Nazeeruddin, M. Gratzel, Journal of Physical Chemistry C 116 (2012) 18124-18131.

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