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Stark effects in D35-sensitized mesoporous TiO2: influence of dye coverage and electrolyte composition
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.
2015 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 179, 174-178 p.Article in journal (Refereed) Published
Abstract [en]

Strong Stark effects are visible in the spectra of the organic donor-pi-acceptor dye D35 when it is adsorbed onto mesoporous TiO2, both under steady state conditions and under modulated light conditions. The addition of lithium cations to the electrolyte results in a significant red shift of the D35 absorption spectrum, which is attributed to adsorption of Li+ at the TiO2 surface, resulting in a change of the electric field across the adsorbed dye molecules. The dye molecules must therefore be located inside the Helmholtz double layer at the TiO2/electrolyte interface. In photoinduced absorption (PIA) spectroscopy, modulated light is used to excite dye molecules. A significant Stark bleach is found in PIA spectra, which corresponds to a blue shift of the dye absorption spectrum upon addition of electrons to TiO2, due to an electric field across the dye monolayer. The observed bleach is reduced when the concentration of supporting electrolyte is increased, indicating local charge compensation of the electrons in TiO2 by adsorbed cations. Transient absorption studies reveal that screening of the interfacial electric field is faster at lower dye coverage compared to full monolayer coverage. Analysis of the Stark effect in dye-sensitized solar cell gives valuable information on the mechanism of charge compensation of electrons in mesoporous electrodes.

Place, publisher, year, edition, pages
2015. Vol. 179, 174-178 p.
Keyword [en]
Dye-sensitized solar cell, charge compensation, cation adsorption, Helmholtz layer
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-265670DOI: 10.1016/j.electacta.2015.01.068ISI: 000362292200023OAI: oai:DiVA.org:uu-265670DiVA: diva2:866991
Funder
EU, FP7, Seventh Framework Programme, 246124Swedish Energy AgencyStandUp
Available from: 2015-11-04 Created: 2015-11-02 Last updated: 2017-12-01Bibliographically approved

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Pazoki, MeysamHagfeldt, AndersBoschloo, Gerrit

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