On the correlation between dye coverage and photoelectrochemical performance in dye-sensitized solar cells

Viktor Johansson, Lilian Ellis-Gibbings, Trevor Clarke, Mikhail Gorlov, Gunther Andersson, Lars Kloo

    Research output: Contribution to journalArticlepeer-review

    30 Citations (Scopus)

    Abstract

    Concentration depth profiles of the ruthenium based dyes Z907 and N719 adsorbed onto titania are measured directly and used for determining the adsorption isotherm of the dyes. Dye layers formed by both grow in islands on the titania which do not cover the entire titania surface even at the maximum coverage. Impedance spectroscopy in conjunction with the adsorption isotherms shows that recombination losses mainly appear between the dye and the electrolyte solution. The short circuit current and the efficiency increase linearly with the dye coverage. The open circuit voltage slightly increases with increasing dye coverage which is interpreted as most likely to be a consequence of the higher charge in the particles upon higher dye loading on the TiO 2 surface.

    Original languageEnglish
    Pages (from-to)711-718
    Number of pages8
    JournalPhysical Chemistry Chemical Physics
    Volume16
    Issue number2
    DOIs
    Publication statusPublished - 2014

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