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A Series of Iron(II)-NHC Sensitizers with Remarkable Power Conversion Efficiency in Photoelectrochemical Cells** |
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| Authors: | Dr Anil Reddy Marri Edoardo Marchini Dr Valentin Diez Cabanes Dr Roberto Argazzi Dr Mariachiara Pastore Prof Stefano Caramori Prof Carlo Alberto Bignozzi Dr Philippe C Gros |
| Institution: | 1. Université de Lorraine, CNRS, L2CM, 54000 Nancy, France;2. Department of Chemical, Pharmaceutical and Agricultural Sciences, University of Ferrara, Via L.Borsari 46, 44121 Ferrara, Italy;3. Université de Lorraine, CNRS, LPCT, 54000 Nancy, France;4. CNR-ISOF c/o Department of Chemical, Pharmaceutical and Agricultural Sciences, University of Ferrara, Via L.Borsari 46, 44121 Ferrara, Italy |
| Abstract: | A series of six new Fe(II)NHC-carboxylic sensitizers with their ancillary ligand decorated with functions of varied electronic properties have been designed with the aim to increase the metal-to- surface charge separation and light harvesting in iron-based dye-sensitized solar cells (DSSCs). ARM130 scored the highest efficiency ever reported for an iron-sensitized solar cell (1.83 %) using Mg2+ and NBu4I-based electrolyte and a thick 20 μm TiO2 anode. Computational modelling, transient absorption spectroscopy and electrochemical impedance spectroscopy (EIS) revealed that the electronic properties induced by the dimethoxyphenyl-substituted NHC ligand of ARM130 led to the best combination of electron injection yield and spectral sensitivity breadth. |
| Keywords: | DSSC iron complexes light harvesting NHC sensitizers |