Long-Lived Charge Separated State in NiO-Based p‑Type Dye-Sensitized Solar Cells with Simple Cyclometalated Iridium Complexes

Three new cyclometalated iridium complexes were prepared and investigated on nanocrystalline NiO cathodes. Nanosecond transient absorption spectroscopy experiments show they present a surprisingly slow geminate charge recombination upon excitation on NiO, representing thus the first examples of simp...

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Bibliographic Details
Published in:The journal of physical chemistry letters 2014-07, Vol.5 (13), p.2254-2258
Main Authors: Gennari, Marcello, Légalité, Florent, Zhang, Lei, Pellegrin, Yann, Blart, Errol, Fortage, Jérôme, Brown, Allison M, Deronzier, Alain, Collomb, Marie-Noëlle, Boujtita, Mohammed, Jacquemin, Denis, Hammarström, Leif, Odobel, Fabrice
Format: Article
Language:English
Subjects:
Chemical Sciences
Energy Conversion and Storage
Energy and Charge Transport
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Summary:Three new cyclometalated iridium complexes were prepared and investigated on nanocrystalline NiO cathodes. Nanosecond transient absorption spectroscopy experiments show they present a surprisingly slow geminate charge recombination upon excitation on NiO, representing thus the first examples of simple sensitizers with such feature. These complexes were used in dye-sensitized solar cells using nanocrystalline NiO film as semiconductor. The long-lived charge separated state of these Ir complexes make them compatible with other redox mediators than I3 −/I−, such as a cobalt electrolyte and enable to reach significantly high open circuit voltage.
ISSN:1948-7185
1948-7185
DOI:10.1021/jz5009714