Improved conductivity in dye-sensitised solar cells through block-copolymer confined TiO2 crystallisation

Stefan Guldin; Sven Hüttner; Priti Tiwana; M. Christopher Orilall; Burak Ülgüt; Morgan Stefik; Pablo Docampo; Matthias Kolle; Giorgio Divitini; Caterina Ducati; Simon A. T. Redfern; Henry J. Snaith; Ulrich Wiesner; Dominik Eder; Ullrich Steiner

doi:10.1039/C0EE00362J

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Energy & Environmental Science

Issue 1, 2011

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Improved conductivity in dye-sensitised solar cells through block-copolymer confined TiO₂ crystallisation

Stefan Guldin , Sven Hüttner , Priti Tiwana , M. Christopher Orilall , Burak Ülgüt , Morgan Stefik , Pablo Docampo , Matthias Kolle , Giorgio Divitini , Caterina Ducati , Simon A. T. Redfern , Henry J. Snaith , Ulrich Wiesner , Dominik Eder and Ullrich Steiner

Energy Environ. Sci., 2011, 4, 225-233

DOI: 10.1039/C0EE00362J
Received 17 Aug 2010, Accepted 28 Sep 2010
First published on the web 20 Oct 2010

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Anatase TiO₂ is typically a central component in high performance dye-sensitised solar cells (DSCs). This study demonstrates the benefits of high temperature synthesised mesoporous titania for the performance of solid-state DSCs. In contrast to earlier methods, the high temperature stability of mesoporous titania is enabled by the self-assembly of the amphiphilic block copolymer polyisoprene-block-polyethylene oxide (PI-b -PEO) which compartmentalises TiO₂ crystallisation, preventing the collapse of porosity at temperatures up to 700 °C. The systematic study of the temperature dependence on DSC performance reveals a parameter trade-off: high temperature annealed anatase consisted of larger crystallites and had a higher conductivity, but this came at the expense of a reduced specific surface area. While the reduction in specific surface areas was found to be detrimental for liquid-electrolyte DSC performance, solid-state DSCs benefitted from the increased anatase conductivity and exhibited a performance increase by a factor of three.

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Improved conductivity in dye-sensitised solar cells through block-copolymer confined TiO₂ crystallisation

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