Effect of push-pull ruthenium complex adsorption conformation on the performance of dye sensitized solar cells
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Journal of the Brazilian Chemical Society
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A new series of tris-(bipyridyl)ruthenium-like complexes based on the 4-tripheylamine-2,2’:6’,2’’-terpyridine (TPA) push-pull ligand was prepared by incorporation of 4-carboxypyridine (cpy), 4,4’-dicarboxi-2,2’-bipyridine (dcbpy) and 4-carboxyterpyridine ligands (ctpy) ligands, in order to adsorb them on TiO2 in different anchoring conformations. The electron photoinjection and electron recombination processes of the respective dye-sensitized solar cells were greatly influenced by the molecular structure, which defined the surface concentration and surface charge on TiO2, such that the photoconversion efficiency was 10 times larger for [Ru(py)(dcbpy)(TPAtpy)] than for the [Ru(cpy)(bpy)(TPAtpy)](PF6) dye. Molecules anchoring in a more upright position and by a larger number of sites were shown to enhance the electron injection into TiO2 conduction band (CB) improving the short-circuit current (JSC), open circuit voltage (Voc) and the overall photoconversion efficiency. However, a positive net charge in the dye increased the back electron-transfer reactions and induced a decrease in both Voc and conversion efficiency.
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ROSERO, WILMMER A.A.; GUIMARAES, ROBSON R.; MATIAS, TIAGO A.; ARAKI, KOITI. Effect of push-pull ruthenium complex adsorption conformation on the performance of dye sensitized solar cells. Journal of the Brazilian Chemical Society, v. 31, n. 11, p. 2250-2264, 2020. DOI: 10.21577/0103-5053.20200077. Disponível em: http://200.136.52.105/handle/123456789/31628. Acesso em: 30 Dec 2025.
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