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Inorganics 2018, 6(2), 63;

NHC-Based Iron Sensitizers for DSSCs

Université de Lorraine, CNRS, L2CM, F-54000 Nancy, France
Université de Strasbourg, CNRS, IPCMS, F-67000 Strasbourg, France
Université de Lorraine, CNRS, LPCT, F-54000 Nancy, France
Université de Lorraine, CNRS, L2CM, F-57000 Metz, France
Université Rennes, Ecole Nationale Supérieure de Chimie de Rennes, CNRS, ISCR, F-35000 Rennes, France
Author to whom correspondence should be addressed.
Received: 25 May 2018 / Revised: 15 June 2018 / Accepted: 15 June 2018 / Published: 19 June 2018
(This article belongs to the Collection Coordination Complexes for Dye-Sensitized Solar Cells (DSCs))
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Nanostructured dye-sensitized solar cells (DSSCs) are promising photovoltaic devices because of their low cost and transparency. Ruthenium polypyridine complexes have long been considered as lead sensitizers for DSSCs, allowing them to reach up to 11% conversion efficiency. However, ruthenium suffers from serious drawbacks potentially limiting its widespread applicability, mainly related to its potential toxicity and scarcity. This has motivated continuous research efforts to develop valuable alternatives from cheap earth-abundant metals, and among them, iron is particularly attractive. Making iron complexes applicable in DSSCs is highly challenging due to an ultrafast deactivation of the metal–ligand charge-transfer (MLCT) states into metal-centered (MC) states, leading to inefficient injection into TiO2. In this review, we present our latest developments in the field using Fe(II)-based photosensitizers bearing N-heterocyclic carbene (NHC) ligands, and their use in DSSCs. Special attention is paid to synthesis, photophysical, electrochemical, and computational characterization. View Full-Text
Keywords: iron complexes; NHC ligands; excited states; photophysics iron complexes; NHC ligands; excited states; photophysics

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Duchanois, T.; Liu, L.; Pastore, M.; Monari, A.; Cebrián, C.; Trolez, Y.; Darari, M.; Magra, K.; Francés-Monerris, A.; Domenichini, E.; Beley, M.; Assfeld, X.; Haacke, S.; Gros, P.C. NHC-Based Iron Sensitizers for DSSCs. Inorganics 2018, 6, 63.

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