In recent years, with the idea of creating efficient, safe, and low-cost dye-sensitized solar cells (DSSCs), the research moved the attention towards alternative solvent-based electrolytes. Above all, DSSCs with water-based electrolytes have been proposed as one of the possible solution, providing reduced costs, non-flammability and environmental compatibility. Recently, we demonstrated that stability issues can be properly addressed by choosing the appropriate dye. Moreover, the possibility of gelling the liquid solvent into a polymeric matrix can reduce the electrolyte leakage outside the device, increasing the long-term stability. In this contribution, the investigation on a series of iodine and cobalt-based 100% aqueous electrolytes is presented to improve the photoanode/electrolyte interface in the emerging solar energy converters. Thanks to our previous experience and to a multivariate approach (design of experiment, DoE), the effects of the change in redox mediator concentrations and in photoanode preparation on DSSCs performances have been evaluated. Finally, the gelation of the best aqueous electrolytes with bio-derived polymers has been performed. Photovoltaic performances and stabilities will be discussed by comparing liquid and gel electrolytes. In lab-scale solar cells interesting photovoltaic performances superior to 4% were achieved.

Aqueous Solar Cells as Emerging Photovoltaics: Photoelectrochemical and Chemometric Investigation / Bella, Federico; Galliano, S.; Falco, Marisa; Giordano, F.; Hagfeldt, A.; Grätzel, M.; Viscardi, G.; Barolo, C.; Gerbaldi, Claudio. - ELETTRONICO. - (2017), pp. ENFL 98-ENFL 98. ((Intervento presentato al convegno 254th American Chemical Society National Meeting & Exposition tenutosi a Washington (USA) nel August 20-24, 2017.

Aqueous Solar Cells as Emerging Photovoltaics: Photoelectrochemical and Chemometric Investigation

BELLA, FEDERICO;FALCO, MARISA;GERBALDI, CLAUDIO
2017

Abstract

In recent years, with the idea of creating efficient, safe, and low-cost dye-sensitized solar cells (DSSCs), the research moved the attention towards alternative solvent-based electrolytes. Above all, DSSCs with water-based electrolytes have been proposed as one of the possible solution, providing reduced costs, non-flammability and environmental compatibility. Recently, we demonstrated that stability issues can be properly addressed by choosing the appropriate dye. Moreover, the possibility of gelling the liquid solvent into a polymeric matrix can reduce the electrolyte leakage outside the device, increasing the long-term stability. In this contribution, the investigation on a series of iodine and cobalt-based 100% aqueous electrolytes is presented to improve the photoanode/electrolyte interface in the emerging solar energy converters. Thanks to our previous experience and to a multivariate approach (design of experiment, DoE), the effects of the change in redox mediator concentrations and in photoanode preparation on DSSCs performances have been evaluated. Finally, the gelation of the best aqueous electrolytes with bio-derived polymers has been performed. Photovoltaic performances and stabilities will be discussed by comparing liquid and gel electrolytes. In lab-scale solar cells interesting photovoltaic performances superior to 4% were achieved.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11583/2683374
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