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Titel:
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Characterization of the Pore-filling of Solid State Dye Sensitized Solar Cells with Photoinduced Absorption Spectroscopy
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Auteur(s):
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Gepubliceerd door:
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Publicatie datum:
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ECN
Zonne-energie
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30-8-2011
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ECN publicatienummer:
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Publicatie type:
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ECN-W--10-014
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Artikel wetenschap tijdschrift
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Aantal pagina's:
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11
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Gepubliceerd in: International Journal of Photoenergy (Hindawi Publishing Corporation), , 2011, Vol.2011, p.-.
Samenvatting:
Near steady-state photoinduced absorption (PIA) and UV-Vis absorption spectroscopy are used to characterize the porefilling of spiro-MeOTAD (2, 2',7, 7'-tetrakis-(N,N-di-p-methoxyphenylamine)9, 9'-spirobifluorene) into the nanoparticulate TiO2 electrode of a solid-state dye-sensitized solar cell (ssDSC). The volumetric ratio of filled to unfilled pore volumes, as well as the
optical signature of interacting chemical species, that is, the hole-transfer yield (HTY), are investigated. PIA spectroscopy is used to measure the HTY, relative to the amount of spiro-MeOTAD present, without needing to determine the extinction coefficients of the dye and spiro-MeOTAD cation species. The Beer-Lambert law is used to relate the relative PIA signal to the penetration length of the hole-conductor in the TiO2 film. For the sample thickness range of 1.4–5 µm investigated here, the optimum characteristic penetration length is determined to be 3.1 + 0.46 µm, which is compared to 1.4 µm for the 200 mg mL-1 concentration of spiro-MeOTAD conventionally used. Therefore, doubling the effective penetration of spiro-MeOTAD is necessary to functionalize all the dye molecules in a ssDSC.
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