Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)
Publication date: 5th February 2015
The electrochemical properties of coordination compounds can be modified through a rational choice of the metal and an appropriate design of the coordination sphere. These features might guarantee the necessary flexibility to project an electron transfer mediator capable of meeting the kinetic requirements at the basis of the functioning of the DSSC. In principle, to minimize recombination, kinetically slow couples have to be privileged. The relatively high concentration of electrolyte employed in photoelectrochemical cells (0.1-0.5 M in redox active species) requires the use of substantial amounts of electron mediators: as a consequence the choice and the design of the redox couple has to be done with consideration towards inexpensive and available metals, like the elements of the first transition row and easily synthesizable ligands. To date, the most successful attempts have been based on octahedral cobalt (II) [1] and tetrahedral copper (I) complexes [2]. Recent results obtained on octahedral Mn complexes, and on the photoanode engineering [3] in order to limit the dark current, will be discussed.
[1] a) Sapp, S.A.; Elliot, C.M.; Contado, C.; Caramori, S.; Bignozzi C.A. Substituted Polypyridine Complexes of Cobalt(II/III) as Efficient Electron- Transfer Mediators in Dye-Sensitized Solar Cells. J. Am. Chem. Soc. 2002, 124, 11216-11222. b) Cazzanti,S.; Caramori,S.; Argazzi,R.; Elliott,C.M. and Bignozzi,C.A. Efficient Non-Corrosive Electron-Transfer Mediator mixtures for Dye Sensitized Solar Cells. J.Am.Chem.Soc.; 2006; 128; 9996-9997 [2] Colombo, A.; Dragonetti, C.; Magni, M.; Roberto, D.; Demartin, F.; Caramori, S.; Bignozzi, C.A. Efficient Copper Mediators Based on Bulky Asymmetric Phenanthrolines for DSSCs. ACS Appl. Mater.Interfaces, 2014, 6 (16), 13945–13955 [3] a) Mba, M.; D’Acunzo, M; Salice P.; Carofiglio, T.; Maggini, M.; Caramori, S; Campana A.; Aliprandi, A; Argazzi, R.; Carli, S.; Bignozzi C.A. Sensitization of Nanocrystalline TiO2 with Multibranched Organic Dyes and Co (III)/ (II) Mediators: Strategies to Improve Charge Collection Efficiency. J.Phys.Chem.C, 2013, 117, 19885-19896. b) Carli S.; Casarin L.; Caramori S.; Boaretto R.; Busatto, E.; Argazzi R.; Bignozzi C.A. A Viable Surface Passivation Approach to Improve Efficiency in Cobalt Based Dye Sensitized Solar Cells. Polyhedron 82 (2014) 173–180
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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