A series of organic D-π-A dyes, endowed with different siliconbased anchoring groups, has been prepared, to assess the stability of such anchoring moieties on nanocrystalline TiO2 in dye-sensitized solar cells. Due to the difficulties encountered in finding a reliable and robust preparation protocol to obtain pure trialkoxysilanes, replacement with a silatrane moiety was evaluated. It was found that the silatrane group could be easily introduced on three different molecular scaffolds by a simple amide coupling reaction mediated by EDC-Cl. Furthermore, the spectroscopic properties and anchoring mode on nanocrystalline TiO2 of the silatrane-dyes were found to be nearly identical to those of the trialkoxysilane compounds, and both gave a much more stable attachment to the semiconductor compared to their cyanoacrylic acid counterpart, as shown by desorption experiments.
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|Titolo:||Synthesis of Silatrane-Containing Organic Sensitizers as Precursors for Silyloxyl Anchoring Group in Dye Sensitized Solar Cells|
|Appare nelle tipologie:||1.1 Articolo in rivista|