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Blocking the Charge Recombination with Diiodide Radicals by TiO2 Compact Layer in Dye-Sensitized Solar Cells
Swiss Fed Inst Technol Lausanne EPFL, EPFL SB ISIC LSPM, Lab Photomol Sci Inst Chem Sci & Engn, CH-1015 Lausanne, Switzerland.
Swiss Fed Inst Technol Lausanne EPFL, EPFL SB ISIC LSPM, Lab Photomol Sci Inst Chem Sci & Engn, CH-1015 Lausanne, Switzerland.
Lund Univ, Div Phys Chem, SE-22100 Lund, Sweden;Helmholtz Zentrum Berlin, Helmholtz Zentrum Berlin Mat & Energie GmbH, Young Investigator Grp Hybrid Mat Format & Scalin, D-12489 Berlin, Germany.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.
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2019 (English)In: Journal of the Electrochemical Society, ISSN 0013-4651, E-ISSN 1945-7111, Vol. 166, no 9, p. B3203-B3208Article in journal (Refereed) Published
Abstract [en]

The addition of a compact titanium dioxide (TiO2) layer between the fluorine-doped tin oxide (FTO) coated glass substrate and the mesoporous TiO2 layer in the dye-sensitized solar cell (DSC) based on the iodide/triiodide redox couple (I-/I-3(-)) is known to improve its current-voltage characteristics. The compact layer decreases the recombination of electrons extracted through the FTO layer with I-3(-) around the maximum power point. Furthermore, the short-circuit photocurrent was improved, which previously has been attributed to the improved light transmittance and/or better contact between TiO2 and FTO. Here, we demonstrate that the compact TiO2 layer has another beneficial effect: it blocks the reaction between charge carriers in the FTO and photogenerated diiodide radical species (I-2(-center dot)). Using photomodulated voltammetry, it is demonstrated that the cathodic photocurrent found at bare FTO electrodes is blocked by the addition of a compact TiO2 layer, while the anodic photocurrent due to reaction with I-2(-center dot) is maintained.

Place, publisher, year, edition, pages
ELECTROCHEMICAL SOC INC , 2019. Vol. 166, no 9, p. B3203-B3208
National Category
Physical Chemistry Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-383838DOI: 10.1149/2.0281909jesISI: 000466839800002OAI: oai:DiVA.org:uu-383838DiVA, id: diva2:1318143
Funder
Swedish Energy AgencySwedish Research Council, 2015-00163Knut and Alice Wallenberg FoundationAvailable from: 2019-05-27 Created: 2019-05-27 Last updated: 2019-05-27Bibliographically approved

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