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Panchromatic light harvesting and record power conversion efficiency for carboxylic/cyanoacrylic Fe(ii) NHC
Anil Reddy-Marri1, Edoardo Marchini2, Valentin Diez Cabanes3
1Department of Chemistry, North Carolina State University 851 Main Campus Drive Raleigh North Carolina 27695-8204 USA.
Abstract:
Fe(ii) pyridyl-NHC sensitizers bearing thienylcyanoacrylic (ThCA) anchoring groups have been designed and characterized with the aim of enhancing the metal to surface charge separation and the light harvesting window in iron-sensitized DSSCs (FeSSCs). In these new Fe(ii) dyes, the introduction of the ThCA moiety remarkably extended the spectral response and the photocurrent, in comparison with their carboxylic analogues. The co-sensitization based on a mixture of a carboxylic and a ThCA-iron complex produced a panchromatic absorption, up to 800 nm and the best photocurrent and efficiency (J sc: 9 mA cm-2 and PCE: 2%) ever reported for an FeSSC.
