Effect of Out-of-Plane Alkyl Chains in Dye-Sensitized Solar Cell Efficiency: a Structure-Property Relationship in Novel Perimidine-Based Squaraine Dyes
Marco Giordano a, G Renno a, N. Barbero a, S. M. Zakeeruddin b, M. Grätzel b, C. Barolo a, A. Fin c, G. Viscardi a
a Dipartimento di Chimica, NIS Interdepartmental and INSTM Reference Centre, Università di Torino, Torino, Italy
b Laboratoire de Photonique et interfaces, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
c Dipartimento di Scienza e Tecnologia del Farmaco, Università di Torino, Torino, Italy
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Contributed talk, Marco Giordano, presentation 142
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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