Characterization of the Pore Filling of Solid State Dye Sensitized Solar Cells with Photoinduced Absorption Spectroscopy
Figure 5
The scale of the CPL (μm), times the porosity (%), is the same as the one for the desorbed mass (μg) for spiro-OMeTAD with a density of 1 g/cm3 (see text). Average calculated and experimental values of the mass are plotted versus spiro-MeOTAD concentration. The experimentally determined mass desorbed from the samples (◂) is much lower than the calculated total mass (□) and should be greater than the calculated mass in the pores (★) because the former also includes the overlayer. The uncorrected CPL (∙) is equal to the calculated mass in the pores (★). These values indicate that the filling fraction overestimates the amount of spiro-MeOTAD which actually infiltrates the pores. The correction for viscosity effects (○) for higher concentrations of spiro-MeOTAD gives an improved value for the CPL, or calculated mass in the pores. (The standard deviation of all CPL and desorbed mass values is <0.12 μm.)
