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Issue 12, 2007
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Dye-sensitized solar cells based on novel donor–acceptor π-conjugated benzofuro[2,3-c]oxazolo[4,5-a]carbazole-type fluorescent dyes exhibiting solid-state fluorescence

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Abstract

Novel donor–acceptor π-conjugated benzofuro[2,3-c]oxazolo[4,5-a]carbazole-type fluorescent dyes (2a2d) with substituents (R = H, butyl, benzyl and 5-nonyl) on the nitrogen of carbazole ring have been designed and synthesized as sensitizers in dye-sensitized solar cells (DSSCs). Absorption and fluorescence properties of 2a2d are similar in solution. In the solid state, however, the dyes 2c (R = benzyl) and 2d (R = 5-nonyl) with bulky substituents exhibit strong solid-state fluorescence properties, which are attributed to the reduction of the π–π interaction between the dyes. Photovoltaic parameters of DSSCs based on 2a2d are measured with the amount of dyes adsorbed on TiO2 film as a parameter. It is found that the 2d exhibits a 100% efficiency for absorbed photon-to-current conversion, demonstrating that bulky substituents in 2d can efficiently prevent intermolecular energy transfer between the dyes in molecular aggregation states.

Graphical abstract: Dye-sensitized solar cells based on novel donor–acceptor π-conjugated benzofuro[2,3-c]oxazolo[4,5-a]carbazole-type fluorescent dyes exhibiting solid-state fluorescence

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Publication details

The article was received on 08 May 2007, accepted on 19 Jul 2007 and first published on 08 Aug 2007


Article type: Paper
DOI: 10.1039/B706896D
Citation: New J. Chem., 2007,31, 2076-2082
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    Dye-sensitized solar cells based on novel donor–acceptor π-conjugated benzofuro[2,3-c]oxazolo[4,5-a]carbazole-type fluorescent dyes exhibiting solid-state fluorescence

    Y. Ooyama, A. Ishii, Y. Kagawa, I. Imae and Y. Harima, New J. Chem., 2007, 31, 2076
    DOI: 10.1039/B706896D

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