Tuning light harvesting properties of terpyridine ligand based panchromatic ruthenium complexes.

Davide Saccone^a, Claudia Barolo^a, Guido Viscardi^a, Roberto Buscaino^a, Carlo Bignozzi^b, Stefano Caramori^b, Rita Boaretto^b

^aDipartimento di chimica, Università degli studi di Torino, Via P.Giuria 7, Torino, 10125, Italy

^bUniversity of Ferrara, Italy, Via Fossato di Mortara, 17, Ferrara, Italy

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Davide Saccone, 383
Publication date: 5th February 2015

In 2001 Nazeeruddin et al. published the black dye¹(BD), a terpyridine ligand based ruthenium complex used in DSSC technology. Compared with bipyridine complexes such as N719, BD shows peculiar light harvesting properties in terms of green color and conversion efficiency. Its panchromatic absorption arises from both the stabilization of antibonding orbitals involved in metal to ligand charge-transfer transitions (MLCT) and the concomitant destabilization of the highest occupied molecular orbitals.Here, we present a novel BD-like ruthenium complex with increased molar extinction coefficient thanks to extended πconjugation of terpyridine’s ligand. As reported in literature² for dipyridine based complexes,this allows for a reduction of TiO₂ film thickness leading to an increased efficiency in solar cells, owing to reducedtransport losses in the nanoporous environment. Different synthetic pathways were tested and relative yields and cost compared. Moreover thanks to the use of microwave we were able to speed up both kinetics and reaction yields, especially for heterocoupling steps.

1. Nazeeruddin, M. K.; Péchy, P.; Renouard, T.; Zakeeruddin, S. M.; Humphry-Baker, R.; Comte, P.; Liska, P.; Cevey, L.; Costa, E.; Shklover, V.; Spiccia, L.; Deacon, G. B.; Bignozzi, C. a; Grätzel, M. Engineering of efficient panchromatic sensitizers for nanocrystalline TiO2-based solar cells. J. Am. Chem. Soc. 2001, 123, 1613–24 . 2. Nazeeruddin, M. K.; Klein, C.; Liska, P.; Grätzel, M. Synthesis of novel ruthenium sensitizers and their application in dye-sensitized solar cells. Coord. Chem. Rev. 2005, 249, 1460–1467.

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