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Title: Organic chromophores based on a fused Bis-Thiazole core and their application in Dye-Sensitized Solar Cells
Authors: Dessì, A.
Barozzino Consiglio, G.
Calamante, M.
Reginato, G.
Mordini, A.
Peruzzini, M.
Taddei, Maurizio 
Sinicropi, Adalgisa 
Parisi, Maria Laura 
Fabrizi De Biani, Fabrizia 
Basosi, Riccardo 
Mori, R.
Spatola, M.
Bruzzi, M.
Zani, L.
Keywords: Synthetic methods; Dyes; Pigments; Fused-ring systems; Photochemistry; Sensitizers; Solar cells
Issue Date: 2013
Project: None 
Four new D-π-A organic dyes incorporating either a thiazolo[5,4-d]thiazole bicyclic system (TTZ1–2) or a benzo[1,2-d:4,5-d]bisthiazole tricyclic unit (BBZ1–2) have been synthesized and fully characterized. The key steps of the synthesis include an efficient MW-assisted preparation of the thiazolo-[5,4-d]thiazole core and selective functionalization of two different dihalothienyl derivatives through Suzuki coupling. All the compounds showed photo- and electrochemical properties compatible with their employment in dye-sensitized solar cells. In addition, their electronic structure and transitions were investigated by means of TD-DFT calculations. Dye-sensitized solar cells fabricated with dye TTZ1 yielded an average power conversion efficiency corresponding to 43 and 60% of the performances recorded under the same conditions for cells containing reference dyes N3 and D5, respectively.Efficiency measurements and electrochemical impedancespectroscopy (EIS) experiments indicated that use of chenodeoxycholic acid (CDCA) as a co-adsorbent was beneficial to disrupt dye-dye interactions and slow down recombination processes within the cells, thus allowing powerconversion efficiencies up to 3.53% to be obtained.
ISSN: 1099-0690
DOI: 10.1002/ejoc.201201629
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