Berlin 2008 – scientific programme

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SYSA: Symposium Tayloring Organic Interfaces: Molecular Structures and Applications

SYSA 5: Poster Session SYSA

SYSA 5.41: Poster

Tuesday, February 26, 2008, 14:30–20:00, Poster A

Photoelectrochemical characterization of the role of organic sensitizers adsorbed on nanostructured ZnO — •Andreas Hastall, Thomas Loewenstein, and Derck Schlettwein — Institut für Angewandte Physik, Justus-Liebig-Universität Gießen, Heinrich-Buff-Ring 16, D-35392 Gießen, Germany

Porous sensitized ZnO is a promising material for application as electrode in dye-sensitized solar cells (DSSC) to utilize the intense absorption of organic sensitizers in the visible spectral range [1]. Electrochemical deposition of ZnO from aqueous solutions is a low temperature process (<150°C) which allows the use of various substrates. The process can be performed at low energy input and cost and is therefore promising short pay-back times and high net energy gains. The role of the adsorbed sensitizer dye and resulting charge carrier generation, collection, but also recombination in the interface of ZnO/sensitizer/electrolyte of DSSC were analyzed in detail by transient photocurrent measurements, intensity modulated photocurrent and photovoltage spectroscopy (IMPS / IMVS) [2], photovoltage decay and charge-extraction [3]. Results will be discussed for different sensitizers adsorbed to the ZnO surface and for ZnO prepared on various substrates and optimized in structure and morphology.

[1] T. Yoshida, M. Iwaya, H. Ando, T. Oekermann, K. Nonomura, D. Schlettwein, D. Wöhrle, H. Minoura, Chem. Comm. 4, 400 (2004). [2] G. Schlichthörl, S.Y. Huang, J. Sprague, A.J. Frank, J. Phys. Chem. B. 101, 8141 (1997). [3] N.W. Duffy, L.M. Peter, R.M.G. Rajapakse, K.G.U. Wijayantha, Electrochem. Comm. 2, 658 (2000).