Interfacial charge recombination between e--TiO2 and the I-/I3- electrolyte in ruthenium heteroleptic complexes: Dye molecular structure-open circuit voltage relationship

Anna Reynal, Amparo Forneli, Eugenia Martinez-Ferrero, Antonio Sánchez-Díaz, Antón Vidal-Ferran, Brian C. O'Regan, Emilio Palomares

    Research output: Contribution to journalArticle

    110 Citations (Scopus)

    Abstract

    A series of heteroleptic ruthenium(II) polypyridyl complexes containing phenanthroline ligands have been designed, synthesized, and characterized. The spectroscopic and electrochemical properties of the complexes have been studied in solution and adsorbed onto semiconductor nanocrystalline metal oxide particles. The results show that for two of the ruthenium complexes, bearing electron-donating (-NH2) or electron-withdrawing (-NO2) groups, the presence of the redox-active I-/I3- electrolyte produces important changes in the interfacial charge transfer processes that limit the device performance. For example, those dyes enhanced the electron recombination reaction between the photoinjected electrons at TiO2 and the oxidized redox electrolyte. In an effort to understand the details of such striking observations, we have monitored the charge transfer reactions taking place at the different interfaces of the devices using time-resolved single photon counting, laser transient spectroscopy, and light-induced photovoltage measurements.

    Original languageEnglish
    Pages (from-to)13558-13567
    Number of pages10
    JournalJournal of the American Chemical Society
    Volume130
    Issue number41
    DOIs
    Publication statusPublished - 15 Oct 2008

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