Abstract
A series of N-heterotriangulenes decorated with 4-pyridyl anchors were synthesized and their performance in n-type TiO2- and ZnO-based dye-sensitized solar cells investigated.
Highlights
A series of dimethylmethylene-bridged N-heterotriangulenes decorated with one, two, and three electron-withdrawing 4-pyridyls were synthesized
Numerous types based on organic electron donors, such as indoline,[5] thiophene,[6] dithiafulvene,7 4H-pyran4-ylidene,[8] in general, and, triphenylamine,[9,10] in particular, have been developed and applied in dye-sensitized solar cells (DSSCs)
Organic sensitizers combining N-heterotriangulene donors with pyridyl anchoring moieties have not been reported to date
Summary
A series of dimethylmethylene-bridged N-heterotriangulenes decorated with one, two, and three electron-withdrawing 4-pyridyls were synthesized. The LUMO energies experience a more pronounced stabilization upon increasing the number of the electron-withdrawing pyridyls, when compared to the HOMO energies. It is the slow adsorption onto the electrode surface, leading to a low dye loading compared to their carboxylic acid congeners, and, on the other hand, the rather moderate electron injection rate.[13] As a matter of fact, the latter factor is impacted by the number of pyridyls attached to the dye and the type of electrode.
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