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Optimization of a quasi-solid state dye-sensitized photoelectrochemic solar cell employing a ureasil/sulfolane gel electrolyte
Stathatos, Elias ...
A quasi-solid-state, dye-sensitized photoelectrochemical solar cell employing a gel electrolyte obtained by sol-gel chemistry is described. The gel electrolyte is based on a ureasil precursor (i.e., ...a poly(propylene oxide) oligomer end-capped by triethoxysilane groups through urea bridges) and sulfolane and it incorporates the I3-žI- redox couple. It is shown that the combination of these two reagents prevents crystallization of KI, thus ensuring a long life for the cell and a satisfactory overall efficiency that surpasses 5 %. Cell efficiency increases with temperature. Optimization of gel-electrolyte performance has been obtained by studying mobility with fluorescence-quenching techniques complemented by direct-current conductivity measurements.
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