The effect of additional electron donating group on the photophysics and photovoltaic performance of two new metal free D-π-A sensitizers
| Autor: | An. Margalias, Kostas Seintis, Mesude Zeliha Yigit, Dimitra Sygkridou, Mustafa Can, Mihalis Fakis, Elias Stathatos, V. Giannetas |
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| Rok vydání: | 2015 |
| Předmět: |
chemistry.chemical_classification
Process Chemistry and Technology General Chemical Engineering Electron donor Electrolyte Electron acceptor Triphenylamine Electrochemistry Photochemistry Dielectric spectroscopy chemistry.chemical_compound Dye-sensitized solar cell chemistry Time-resolved spectroscopy |
| Zdroj: | Dyes and Pigments. 121:316-327 |
| ISSN: | 0143-7208 |
| DOI: | 10.1016/j.dyepig.2015.05.028 |
| Popis: | The synthesis, photophysical, electrochemical and photovoltaic properties of two D-π-A organic sensitizers, having triphenylamine as electron donor (with or without additional electron donating hexyloxy group), carboxylic acid as electron acceptor and benzimidazole group as π-bridge, are described in detail. The photophysical measurements were carried out for the dyes in solutions and on TiO 2 and Al 2 O 3 nanostructured films using time resolved spectroscopy in the fs-ps and ns time scale. The electron injection dynamics on a series of TiO 2 nanostructured films sensitized with the two dyes, have shown a faster electron injection for the dye with additional electron donating group. The photovoltaic characterization has shown a maximum overall conversion efficiency of 3.4% for dye sensitized solar cells with a quasi-solid state electrolyte. The performance of the solar cells is explained in terms of the photophysical properties, electron injection dynamics and local resistance to charge transfer across the TiO 2 -electrolyte interface measured with electrochemical impedance spectroscopy. |
| Databáze: | OpenAIRE |
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