Tetrazolate Based Dyes for Efficient and Long-term Stable Dye Sensitized Solar Cells

Tarek Ghaddar^a, Tharallah Shoker^a

^aAmerican University of Beirut, Chemistry, Beirut, 11, Lebanon

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, Tarek Ghaddar, 398
Publication date: 5th February 2015

The dye structure is a key component in a Dye Sensitized Solar Cell (DSSC). Designing metal based dyes that lack the thiocyanate ligand (SCN^-), which is considered from long-term chemical stability tests as the weakest part in most ruthenium-based dyes,¹is of great interest. In addition, red-shifting the absorption band of the sensitizer and increasing the molar absorption extinction coefficient in the visible and near-IR region may have positive effects on the DSSCs’ efficiencies. In the present study, we report the design of two families of Ru(II) based dyes that contain tetrazolates as building blocks. The first family bears a (4,4',4''-tricarboxy- 2,2':6',2''-terpyridine) moiety, whereas the second one bears a (4,4'-dicarboxy- 2,2'-bipyridine) as the anchoring ligands to titanium dioxide and anionic tetrazolate moieties as the ancillary ligands, Scheme 1. DSSC's fabricated with these dyes show good efficiencies and low electron recombination processes with an iodide/triiodide redox couple. Furthermore, the (4,4',4''-tricarboxy- 2,2':6',2''-terpyridine) based dye with a tri-chelate ancillary ligand showed superb long term stability under 1 sun irradiation and thermal soaking at 65 ^oC for 2000 h.
Scheme 1: Dyes’ structures
[1] Bessho, T.; Yoneda, E.; Yum, J.H.; Guglielmi, M.; Tavernelli, I.; Imai, H.; Rothlisberger, U.; Nazeeruddin, M.K.; Grätzel, M. New Paradigm in Molecular Engineering of Sensitizers for Solar Cell Applications. J. Am. Chem. Soc., 2009, 131, 5930.

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