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Cobalt(II/III) Redox Electrolyte in ZnO Nanowire-Based Dye-Sensitized Solar Cells
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.
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2013 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 5, no 6, 1902-1906 p.Article in journal (Refereed) Published
Abstract [en]

In this work, we explore the use of cobalt complex redox shuttles in dye sensitized solar cells (DSCs) based on ZnO nanowires (NWs). Arrays of vertically aligned ZnO NWs produced by a low-cost hydrothermal method are used to fabricate DSCs with [Co(bpy)(3)](2+/3+) as electrolyte. A direct comparison of the performance of [Co(bpy)(3)](2+/3+)-based ZnO DSC with I-/I-3(-)-based ones demonstrates the higher suitability of the cobalt complex, both in terms of a larger open circuit voltage (V-OC) and a higher photocurrent. The [Co(bpy)(3)](2+/3+) electrolyte results in V-OC enhancements above 200 mV. This V-OC increase is associated to the better match between the cobalt complex redox potential and the oxidation potential of the dye. The incident photon-to-current efficiency (IPCE) enhancement is attributed to a less competitive visible light absorption of the cobalt redox couple. Thus the present study opens new opportunities to improve energy conversion efficiency in ZnO-based DSCs.

Place, publisher, year, edition, pages
2013. Vol. 5, no 6, 1902-1906 p.
Keyword [en]
cobalt complex redox shuttles, ZnO nanowires, dye sensitized solar cell, photovoltaics, energy
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-200111DOI: 10.1021/am400042sISI: 000317031900005OAI: oai:DiVA.org:uu-200111DiVA: diva2:622638
Note

De två (2) första författarna delar förstaförfattarskapet.

Available from: 2013-05-22 Created: 2013-05-20 Last updated: 2017-12-06Bibliographically approved

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Hao, YanJohansson, Erik M. J.Boschloo, GerritHagfeldt, Anders

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