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 mu m 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.

A Series of Iron(II)-NHC Sensitizers with Remarkable Power Conversion Efficiency in Photoelectrochemical Cells

Edoardo Marchini
Secondo
Membro del Collaboration Group
;
Roberto Argazzi
Membro del Collaboration Group
;
Mariachiara Pastore
;
Stefano Caramori
Writing – Original Draft Preparation
;
Carlo Alberto Bignozzi
Penultimo
;
2021

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 mu m 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.
2021
Reddy Marri, Anil; Marchini, Edoardo; Diez Cabanes, Valentin; Argazzi, Roberto; Pastore, Mariachiara; Caramori, Stefano; Bignozzi, Carlo Alberto; Gros, Philippe C.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2475781
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