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Updated: May 3, 2026

Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
Published on: September 12, 2014
NIR-absorbing heptamethine dyes with tailor-made counterions for application in light to energy conversion
Anna C Véron1, Hui Zhang, Anthony Linden
1Laboratory for Functional Polymers, Swiss Federal Laboratories for Materials Science and Technology (Empa) , 8600 Dübendorf, Switzerland.
Abstract:
A method to exchange the counterion of cyanine dyes to Δ-TRISPHAT(-) and PF6(-) is presented. The influence of these counterions on the photophysical and electrochemical properties of the cyanine dye in solution is discussed, and tendencies in the solid packing are highlighted by X-ray crystal structures. The compounds were applied in semitransparent bilayer organic solar cells together with C60, and a power conversion efficiency of 2.2% was achieved while maintaining a high transparency level in the visible region of 66%.
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