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Proceedings Paper

Characterization of pore-filling of spiro-MeOTAD in solid-state dye-sensitized solar cells and its consequence in device performance
Author(s): I-Kang Ding; Nicolas Tétreault; Brian E. Hardin; Eva H. Smith; Michael Grätzel; Michael D. McGehee
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Paper Abstract

In this paper, the pore filling of spiro-MeOTAD (2,2',7,7'-tetrakis-(N,N-di-p-methoxyphenylamine)9, 9'-spirobifluorene) in mesoporous TiO2 films is quantified for the first time using XPS depth profiling and UVVis absorption spectroscopy. We show that spiro-OMeTAD can penetrate the entire depth of the film, and its concentration is constant throughout the film. We determine that in a 2.5-•m-thick film, the volume of the pores is 60-65% filled. The pores become less filled when thicker films are used. Such filling fraction is much higher than the solution concentration because the excess solution on top of the film can act as a reservoir during the spin coating process. Lastly, we demonstrate that by using a lower spin coating speed and higher spiro-OMeTAD solution concentration, we can increase the filling fraction and consequently the efficiency of the device.

Paper Details

Date Published: 4 September 2009
PDF: 8 pages
Proc. SPIE 7416, Organic Photovoltaics X, 74161O (4 September 2009); doi: 10.1117/12.826408
Show Author Affiliations
I-Kang Ding, Stanford Univ. (United States)
Nicolas Tétreault, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Brian E. Hardin, Stanford Univ. (United States)
Eva H. Smith, Stanford Univ. (United States)
Michael Grätzel, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Michael D. McGehee, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 7416:
Organic Photovoltaics X
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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