In recent years, with the idea of creating efficient, safe, and low-cost 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 sensitizers with appropriate molecular structure. 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, without limiting the overall photovoltaic performances. In this contribution, the investigation on a series of iodine and cobalt-based 100% aqueous electrolytes is presented. Thanks to our previous experience and to a multivariate approach (Design of Experiment), 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 low-cost, 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 efficiencies close to 4.5% were achieved.

Biosourced polymers for aqueous solar cells: a possible breakthrough towards green photovoltaic commercialization / Galliano, S.; Bella, F.; Falco, M.; Barolo, C.; Giordano, F.; Boschloo, G.; Grätzel, M.; Hagfeldt, A.; Gerbaldi, C.; Viscardi, G.. - ELETTRONICO. - 5:(2017), pp. 41-41. ((Intervento presentato al convegno XXVI Congresso Nazionale della Società Chimica Italiana tenutosi a Paestum (Italy) nel 10-14 Settembre 2017.

Biosourced polymers for aqueous solar cells: a possible breakthrough towards green photovoltaic commercialization

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

Abstract

In recent years, with the idea of creating efficient, safe, and low-cost 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 sensitizers with appropriate molecular structure. 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, without limiting the overall photovoltaic performances. In this contribution, the investigation on a series of iodine and cobalt-based 100% aqueous electrolytes is presented. Thanks to our previous experience and to a multivariate approach (Design of Experiment), 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 low-cost, 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 efficiencies close to 4.5% were achieved.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11583/2683434
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