Effect of Push-Pull Ruthenium Complex Adsorption Conformation on the Performance of Dye Sensitized Solar Cells

Autor(es)

Rosero, Wilmmer A. A. ^{[1, 2]} ; Guimaraes, Robson R. ^[1] ; Matias, Tiago A. ^{[1, 3]} ; Araki, Koiti ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Quim Fundamental, Inst Quim, Av Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP - Brazil

^[2] Inst Pesquisas Energet & Nucl IPEN CNEN SP, Av Prof Lineu Prestes 2242, BR-05508000 Sao Paulo, SP - Brazil

^[3] Univ Fed ABC UFABC, Ctr Ciencias Nat & Humanas CCNH, Av Estados 5001, BR-09210580 Santo Andre, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of the Brazilian Chemical Society; v. 31, n. 11, p. 2250-2264, NOV 2020.
• Citações Web of Science: 0

Resumo

A new series of tris-(bipyridyl)ruthenium-like complexes based on the 4-tripheylamine2,2':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 (J(SC)), open circuit voltage (V oc) 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 V-oc and conversion efficiency. (AU)

• Processo FAPESP: 18/21489-1 - Nanotecnologia supramolecular: design, materiais e dispositivos
• Beneficiário: Henrique Eisi Toma
• Modalidade de apoio: Auxílio à Pesquisa - Temático