What's the correlation between dye-loading, efficiency and stability in DSC? A chemometric study on dipping conditions.

Guido Viscardi^a, Simone Galliano^a, Pierluigi Quagliotto^a, Claudia Barolo^a, Marco Milanesio^b, Valentina Gianotti^b, Giada Favaro^b

^aUniversità degli Studi di Torino, Via P. Giuria 7, Torino, 10125, Italy

^bUniversità del Piemonte Orientale “A. Avogadro”, Viale T. Michel 11, 15121 Alessandria (TO), Italy

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Simone Galliano, 393
Publication date: 5th February 2015

In the last 20 years, Dye-sensitized Solar Cells (DSCs) have attracted great interest in photovoltaic field, however they are not yet commercialized on a large-scale. Although DSCs are relatively inexpensive and easy to assembly, efficiency and stability are still limited when compared to conventional Si-based technologies. One of the crucial elements in DSCs is the photosensitizer because its structure, loading and anchoring on TiO₂ have significant influence on power conversion efficiency as well as device stability. In recent years the research has focused on understanding the photovoltaic processes and improving the photoconversion efficiencies, currently around 12-13%^[1,2]. On the contrary, less work has been spent on dye-loading and long-term PV cell stability. The present work aims at improving the more critical PV cell parameters (dye-loading, efficiency and stability, considered the responses of the system), by studying and optimizing the dipping process of the photoelectrode. By a multivariate approach, several factors, i.e. solvent, concentration of sensitizer (D5) and co-adsorbent (CDCA), time and temperature of soaking, were taken into account (fig. 1)^[3]. In this way, it was possible at first to observe the dependence between factors and each response, and then to find the correlations between dye-loading, efficiency and stability, in order to optimize them at the same time.<
D5 structure, dye solutions, sensitized photoelectrode and dye uptake in function of different dipping conditions.
[1] Yella, A.; Lee, H.; Tsao, H.; Yi, C.; Chandiran, A.; Nazeeruddin, M.; Diau, E.; Yeh, C.; Zakeeruddin, S.; Grätzel, M.; Porphyrin-Sensitized Solar Cells with Cobalt (II/III)-Based Redox Electrolyte Exceed 12% Efficiency. Science 2011, 343, 629-633. [2] Mathew, S.; Yella, A.; Gao, P.; Humphry-Baker, R.; Nazeeruddin, M.; Grätzel, M.; Dye-sensitized solar cells with 13% efficiency achieved through the molecular engineering of porphyrin sensitizers. Nature Chem 2014, 6, 242-247. [3] Gianotti, V.; Favaro, G.; Bonandini, L.; Palin, L.; Croce, G.; Boccaleri, E.; Artuso, E.; van Beek, W.; Barolo, C.; Milanesio, M.; Rationalization of Dye Uptake on Titania Slides for Dye-Sensitized Solar Cells by a Combined Chemometric and Structural Approach. ChemSusChem 2014, 7, 3039-3052.

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