Improved Conductivity in Dye-sensitised Solar Cells Through Block-copolymer Confined TiO2 Crystallization
Guldin, S.; Huttner, S.; Tiwana, P.; Orilall, M.C.; Ulgut, B.; Stefik, M.; Docampo, P.; Kolle, M.; Divitini, G.; Ducati, C.; Redfern, S.A.T.; Snaith, H.J.; Wiesner, U.B.; Eder, D.; Steiner, U.
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.
The Royal Society of Chemistry
Dye-sensitised; Solar cells; Mesoporous titania
Previously Published As
Energy and Environmental Science, 4, 1,(225-233) 2011,