Fine-tuning the coordination atoms of copper redox mediators: an effective strategy for boosting the photovoltage of dye-sensitized solar cells

Herein, we report a new class of copper complexes bearing a tetradentate polythioether ligand, [(S₄)Cu]^2+/+ (1^2+/+, S₄ = 1,4,8,11-tetrathiocyclotetradecane), as a redox mediator in dye-sensitized solar cells (DSCs).