BIBLIOS

Tipo
Artigos em Revista

Tipo de Documento
Artigo Completo

Título
The role of ethanol-water solvent mixtures in N719 sensitization of electrodeposited ZnO nanorods

Participantes na publicação
Daniel Siopa (Author)
Ricardo Nunes (Author)
Filomena Martins (Author)
Dep. Química e Bioquímica
CQB
M. Soledade C. S. Santos (Author)
Dep. Química e Bioquímica
CQB
Killian Lobato (Author)
Dep. Engenharia Geográfica, Geofísica e Energia
IDL
Anabela Gomes (Author)
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA

Resumo
Water plays an important role in N719 sensitization of ZnO films for application as photoanodes in DSC devices. The role of water content in ethanolic N719 sensitization solutions was examined resorting to N719-solvent interaction studies based on Kamlet-Taft solvatochromic parameters. Results show that as the water content increases, solvent’s HBA ability decreases, hindering dye aggregation in solution and increasing the fraction of dye carboxylic groups available for anchorage onto the charged ZnO surface. The impact of dye-dye-solvent equilibria in solution on ZnO nanorod films sensitization and device behavior was evaluated. Devices assembled with films sensitized in N719 solutions containing equal parts of ethanol and water showed a twofold increase in short-circuit current densities when compared to those sensitized in ethanol only, despite exhibiting significantly less stained films. Data indicate that the presence of water in the sensitization solution reduces the amount of dye aggregates in solution and on the ZnO surface.


Instituição
FACULDADE DE CIÊNCIAS DA UNIVERSIDADE DE LISBOA

Suporte
Journal of Solid State Electrochemistry

Identificadores da Publicação
ISSN - 1432-8488

Editora
Springer Science and Business Media LLC



Identificadores do Documento
URL - http://dx.doi.org/10.1007/s10008-018-3985-0
DOI - https://doi.org/10.1007/s10008-018-3985-0

Identificadores de Qualidade
SCIMAGO Q2 (2018) - 0.606 - Eletrochemistry
Web Of Science Q3 (2018) - 2.531 - electrochemistry
SCIMAGO Q2 (2018) - 0.606 - Materials Science ( miscelaneous)

Keywords
ZnO nanorods ZnO-based photoanodes sensitization Kamlet-Taft solvent parameters Solvent effect on N719 dye aggregation

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