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.
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