Molecular adjustment of the electronic properties of nanoporous electrodes in dye-sensitized solar cells

Sven Rühle, Miri Greenshtein, S. G. Chen, Alexandra Merson, Hillel Pizem, Chaim S. Sukenik, David Cahen, Arie Zaban

Research output: Contribution to journalArticlepeer-review

322 Scopus citations

Abstract

Molecular modification of dye-sensitized, mesoporous TiO2 electrodes changes their electronic properties. We show that the open-circuit voltage (Voc) of dye-sensitized solar cells varies linearly with the dipole moment of coadsorbed phosphonic, benzoic, and dicarboxylic acid derivatives. A similar dependence is observed for the short-circuit current density (Isc). Photo voltage spectroscopy measurements show a shift of the signal onset as a function of dipole moment. We explain the dipole dependence of the Voc in terms of a TiO2 conduction band shift with respect to the redox potential of the electrolyte, which is partially followed by the energy level of the dye. The Isc shift is explained by a dipole-dependent driving force for the electron current and a dipole-dependent recombination current.

Original languageEnglish
Pages (from-to)18907-18913
Number of pages7
JournalJournal of Physical Chemistry B
Volume109
Issue number40
DOIs
StatePublished - 13 Oct 2005

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