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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.
Parisi, Maria Laura
Fabrizi De Biani, Fabrizia
|Keywords:||Synthetic methods; Dyes; Pigments; Fused-ring systems; Photochemistry; Sensitizers; Solar cells||Issue Date:||2013||Project:||None||Journal:||EUROPEAN JOURNAL OF ORGANIC CHEMISTRY||Abstract:||
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.
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