Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
In the past years, water has been discarded as solvent for Dye-Sensitized Solar Cells (DSSC) due to the significantly low performances deriving from its use. In this study, we present an innovative approach to overcome some critical issues such as pore wettability and dye desorption, related to the application of water as electrolyte solvent in DSSC. Through a successful molecular engineering we have been able to maintain unaltered the property of interest of the well-known organic dye D35, and dramatically change its hydrophobic character into hydrophilic. The result of this operation is dye V35, the first organic dye with glycolic chains on the donor moiety. The new hydrophilic dye is able to provide an excellent pore wettability, allowing us to avoid the employment of surfactants. By using an electrolyte composed only by the I-/I3- redox couple, employing chenodeoxycholic acid as co-adsorbent and using PEDOT counter-electrodes, 3% power conversion efficiency under 1-sun illumination, was reached. We show that chenodeoxycholic acid does not significantly increase the wettability, and we provide new insights on the higher performance resulting from its co-adsorption.
a)Molecular structures of hydrophobic dye (D35) and hydrophilic dye (V35); b) Crossed section of a working electrodes sensitized with D35, with a drop of deionized water positioned on the top for contact angle measurement; c) Crossed section of a working electrode sensitized with V35, with a drop of deionized water positioned on the top for contact angle measurement.
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