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CVD-grown TiO2 particles as light scattering structures in dye-sensitized solar cells
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.
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2012 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 2, no 32, 12278-12285 p.Article in journal (Refereed) Published
Abstract [en]

Chemical vapour deposition (CVD) at atmospheric pressure, using TiCl 4 as a precursor, was used to grow nanostructured TiO2 films on glass substrates. At relatively low temperatures (∼245 °C) and using relatively high reactant concentrations, different nano-morphologies of TiO2 were formed simultaneously, such as spheres, nanowires and mesoporous structures. The TiO2 spheres were successfully applied as light-scattering particles in dye-sensitized solar cells, either by direct deposition onto electrodes in the reactor, or by preparation of a printing paste from the deposited particles. For dye-sensitized solar cells using the organic dye D35 as sensitizer and a cobalt-complex based redox electrolyte, a solar cell efficiency of 4.4% was obtained using a 5 μm transparent mesoporous TiO 2 layer. Addition of a 5 μm light-scattering CVD-particle film increased the efficiency by 22% to 5.4%, which was similar to the result obtained with an equally thick commercially available light-scattering film (5.3%). Longer electron lifetime was found using CVD-based films, which is attributed to the presence of more traps in the bulk of the material.

Place, publisher, year, edition, pages
2012. Vol. 2, no 32, 12278-12285 p.
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Natural Sciences
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URN: urn:nbn:se:uu:diva-192066DOI: 10.1039/c2ra21361cISI: 000312148500039OAI: oai:DiVA.org:uu-192066DiVA: diva2:588762
Available from: 2013-01-15 Created: 2013-01-15 Last updated: 2017-12-06Bibliographically approved

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Boschloo, GerritHagfeldt, Anders

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