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Introducing manganese complexes as redox mediators for dye-sensitized solar cells
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2014 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 16, no 24, p. 12021-12028Article in journal (Refereed) Published
Abstract [en]

The abundance and low toxicity of manganese have led us to explore the application of manganese complexes as redox mediators for dye sensitized solar cells (DSCs), a promising solar energy conversion technology which mimics some of the key processes in photosynthesis during its operation. In this paper, we report the development of a DSC electrolyte based on the tris(acetylacetonato) manganese(III)/(IV), [Mn(acac)(3)](0/1+), redox couple. PEDOT-coated FTO glass was used as a counter electrode instead of the conventionally used platinum. The influence of a number of device parameters on the DSC performance was studied, including the concentration of the reduced and oxidized mediator species, the concentration of specific additives (4-tert-butylpyridine, lithium tetrafluoroborate, and chenodeoxycholic acid) and the thickness of the TiO2 working electrode. These studies were carried out with a new donor-pi-acceptor sensitizer K4. Maximum energy conversion efficiencies of 3.8% at simulated one Sun irradiation (AM 1.5 G; 1000 W m(-2)) with an open circuit voltage (V-OC) of 765 mV, a short-circuit current (J(SC)) of 7.8 mA cm(-2) and a fill factor (FF) of 0.72 were obtained. Application of the commercially available MK2 and N719 sensitizers resulted in an energy conversion efficiency of 4.4% with a V-OC of 733 mV and a J(SC) of 8.6 mA cm(-2) for MK2 and a V-OC of 771 mV and a J(SC) of 7.9 mA cm(-2) for N719. Both dyes exhibit higher incident photon to current conversion efficiencies (IPCEs) than K4.

Place, publisher, year, edition, pages
2014. Vol. 16, no 24, p. 12021-12028
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Inorganic Chemistry Materials Chemistry
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URN: urn:nbn:se:umu:diva-129115DOI: 10.1039/c3cp54894eISI: 000337122000022PubMedID: 24394772OAI: oai:DiVA.org:umu-129115DiVA, id: diva2:1058621
Available from: 2016-12-21 Created: 2016-12-21 Last updated: 2018-06-09Bibliographically approved

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Ohlin, C. Andre

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