Solid-state dye-sensitized mesoporous TiO2 solar cells with high photon-to-electron conversion efficiencies

U. Bach, D. Lupo, P. Comte, J. E. Moser, F. Weissörtel, J. Salbeck, H. Spreitzer and M. Grätzel ()
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U. Bach: Institute of Photonics and Interfaces, Swiss Federal Institute of Technology
D. Lupo: Hoechst Research & Technology Deutchland GmbH & Co. KG, Industriepark Höchst
P. Comte: Institute of Photonics and Interfaces, Swiss Federal Institute of Technology
J. E. Moser: Institute of Photonics and Interfaces, Swiss Federal Institute of Technology
F. Weissörtel: Max-Planck-Institut für Polymerforschung
J. Salbeck: Max-Planck-Institut für Polymerforschung
H. Spreitzer: Hoechst Research & Technology Deutchland GmbH & Co. KG, Industriepark Höchst
M. Grätzel: Institute of Photonics and Interfaces, Swiss Federal Institute of Technology

Nature, 1998, vol. 395, issue 6702, 583-585

Abstract: Abstract Solar cells based on dye-sensitized mesoporous films of TiO2 arelow-cost alternatives to conventional solid-state devices1. Impressive solar-to-electrical energy conversion efficiencies have been achieved with such films when used in conjunction with liquid electrolytes2. Practical advantages may be gained by the replacement of the liquid electrolyte with a solid charge-transport material. Inorganic p-type semiconductors3,4 and organic materials5,6,7,8,9 have been tested in this regard, but in all cases the incident monochromatic photon-to-electron conversion efficiency remained low. Here we describe a dye-sensitized heterojunction of TiO2 with the amorphous organic hole-transport material 2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenyl-amine)9,9′-spirobifluorene (OMeTAD; refs. 10 and 11). Photoinduced charge-carrier generation at the heterojunction is very efficient. A solar cell based on OMeTAD converts photons to electric current with a high yield of 33%.

Date: 1998
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DOI: 10.1038/26936

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