Influence of Sodium Cations of N3 Dye on the Photovoltaic Performance and Stability of Dye-Sensitized Solar Cells

• Type: Article in International Scientific Journal
• Date: 2009

Authors

Andrade, L (Author) Other; Zakeeruddin, SM (Author) Other; Nazeeruddin, MK (Author) Other; Ribeiro, HA (Author) Other; Adélio Mendes (Author) FEUP; Graetzel, M (Author) Other

Journal

Title: ChemPhysChem

Vol. 10

Pages: 1117-1124

ISSN: 1439-4235

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 40 Citations

Scopus - 40 Citations

Other information

Authenticus ID: P-003-K4T

DOI: 10.1002/cphc.200900111

Abstract (EN): We report on the effect of substituting the two tetrabutyl ammonium counter ions of the standard N719 dye by sodium ions on the performance and stability of dye-sensitized solar cells (DSCs). The disodium analogue of N719 in conjunction with 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 degrees C. 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8