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Issue 29, 2006
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An efficient organogelator for ionic liquids to prepare stable quasi-solid-state dye-sensitized solar cells

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Abstract

A low molecular weight amphiphilic organogelator capable of forming intermolecular hydrogen bonds and well-organized supramolecular structures was found to efficiently gel low-viscosity binary mixtures of ionic liquids at low concentrations. With this gelator it is possible to prepare stable quasi-solid-state dye-sensitized solar cells (DSCs). At a gelator concentration of only 2 wt%, the sol–gel transition temperature (Tgel) based on the lowest viscosity ionic liquid mixture was at 108 °C, well above the service temperature. Due to the thermoreversible nature of the system, the cells can be conveniently filled with a low-viscosity liquid. Upon cooling and formation of the gel a mechanically stable quasi-solid-state electrolyte was obtained. We successfully employed this quasi-solid ionic liquid electrolyte in DSCs and obtained an efficiency of 6.3% at full sunlight irradiation and maintained its stability during the light soaking accelerating stress test at 60 °C over 1000 h.

Graphical abstract: An efficient organogelator for ionic liquids to prepare stable quasi-solid-state dye-sensitized solar cells

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Article information


Submitted
17 Mar 2006
Accepted
24 Apr 2006
First published
31 May 2006

J. Mater. Chem., 2006,16, 2978-2983
Article type
Paper

An efficient organogelator for ionic liquids to prepare stable quasi-solid-state dye-sensitized solar cells

N. Mohmeyer, D. Kuang, P. Wang, H. Schmidt, S. M. Zakeeruddin and M. Grätzel, J. Mater. Chem., 2006, 16, 2978
DOI: 10.1039/B604021G

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