Polypyridyl ruthenium complexes containing anchoring nitrile groups as TiO2 sensitizers for application in solar cells

Autor(es)

Mecchia Ortiz, Juan H. ^[1] ; Longo, Claudia ^[2] ; Katz, Nestor E. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Nacl Tucuman, INQUINOA CONICET, Inst Quim Fis, Fac Bioquim Quim & Farm, San Miguel De Tucuman - Argentina

^[2] Univ Estadual Campinas, UNICAMP, Inst Chem, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Inorganic Chemistry Communications; v. 55, p. 69-72, MAY 2015.
• Citações Web of Science: 4

Resumo

Ruthenium polypyridyl complexes of general formula {[}Ru(bpy)(3 - x)(Mebpy-CN)(x)](2+) (x = 1,2 and 3, bpy = 2,2'-bipyridine, Mebpy-CN = 4-methyl-2,2'-bipyridine-4'-carbonitrile) can be used as visible dyes in novel solar cells formed with a porous TiO2 film (1 cm(2)), Pt counter-electrode and iodine/iodide as the redox mediator electrolyte dissolved in a polymeric matrix. These complexes can be anchored over the surface of nanocrystalline TiO2 through nitrile groups, as evidenced by Raman spectra of the adsorbed species. Irradiated by a solar simulator (67 mW cm(-2)), the cells assembled with the Ru complexes with x = 2 and 3 as TiO2 sensitizers exhibit almost identical current-potential curves, with short-circuit photocurrents of 1.25 mA cm(-2), fill factors of 0.5 and overall efficiencies around 0.44%. The Ru complex with x = I and a similar Re complex did not perform as well as sensitizers. These data were consistent with results obtained from quantum efficiency curves and impedance spectra. We conclude that complexes with nitrite groups as anchoring entities are promising candidates for designing efficient DSCCs. (C) 2015 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 08/06059-9 - Eletrodos de óxidos semicondutores para aplicação em células solares e na purificação de água por fotocatálise heterogênea
• Beneficiário: Claudia Longo
• Linha de fomento: Auxílio à Pesquisa - Regular
• Processo FAPESP: 08/57867-8 - Instituto Nacional de Ciência, Tecnologia e Inovação em Materiais Complexos Funcionais (INOMAT)
• Beneficiário: Fernando Galembeck
• Linha de fomento: Auxílio à Pesquisa - Temático
• Processo FAPESP: 05/56244-9 - Otimização do uso de energia solar para tratamento de efluentes: fotocatálise heterogênea eletro-assistida utilizando eletrodos nanocristalinos de TiO2 e células solares
• Beneficiário: Claudia Longo
• Linha de fomento: Auxílio à Pesquisa - Regular