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Author(s): Luísa Andrade
Shaik M. Zakeeruddin
Mohammad K. Nazeeruddin
Helena Aguilar Ribeiro
Adélio Mendes
Michael Graetzel
Title: Influence of Sodium Cations of N3 Dye on the Photovoltaic Performance and Stability of Dye-Sensitized Solar Cells
Issue Date: 2009
Abstract: We report on the effect of substituting the two tetrabutyl am-monium counter ions of the standard N719 dye by sodiumions on the performance and stability of dye-sensitized solarcells (DSCs). The disodium analogue of N719 in conjunctionwith a non-volatile electrolyte gives a conversion efficiency of 7.6% under standard global AM 1.5 sunlight. Devices maintain 99% of their initial performance after 1000 h under full sun-light aging at 50 8C. Electrochemical impedance spectroscopy and photovoltage transient decay studies reveal the evolution of the solar cell parameters during aging. Remarkably, upon aging a decrease in the rate of electron back reaction with the triiodide ions across the TiO2/electrolyte interface appears as well as enhanced electronic conduction in the TiO2 film.
Subject: Engenharia química, Outras ciências da engenharia e tecnologias
Chemical engineering, Other engineering and technologies
Scientific areas: Ciências da engenharia e tecnologias::Outras ciências da engenharia e tecnologias
Engineering and technology::Other engineering and technologies
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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