Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
DOI: https://doi.org/10.29363/nanoge.hopv.2022.142
Publication date: 20th April 2022
Squaraine dyes (SQ) are, nowadays, one of the most promising NIR-photosensitizers for Dye-Sensitized Solar Cells (DSSCs) technology. Over the last decade, the squaraine-based DSSCs have been improved in terms of efficiency by well-stablished dye-structure modifications achieving the 9.0% of efficiency. The breakthrough in devices’ performance was reached by the insertion of Out-of-Plane alkyl chains able to prevent the undesirable self-aggregation of SQ dyes on the titania surface.
In this work a systematic structure-property study for novel perimidine-based SQ dyes bearing out-of-plain alkyl chains is described. Two novel series of unsymmetrical squaraines based on indolenine (CI-series) and benzoindolenine (CBI-series) have been synthetized. Alkyl chains of different length decorate both the perimidine core and the indole heterocycle, tuning the self-aggregation of the dye. All squaraines were fully characterized and the effect of the alkyl chains length on the devices’ performances were studied. Moreover, for the best sensitizer preliminary study on the electrolyte’s formulation were carried out to improve the efficiency.
Acknowledgements: This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No 826013 (IMPRESSIVE)
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