Improved conductivity in dye-sensitised solar cells through block-copolymer confined TiO 2 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

Research output: Contribution to journalArticlepeer-review

76 Scopus citations

Abstract

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. © 2011 The Royal Society of Chemistry.
Original languageEnglish (US)
Pages (from-to)225-233
Number of pages9
JournalEnergy Environ. Sci.
Volume4
Issue number1
DOIs
StatePublished - 2011
Externally publishedYes

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