Stepwise Cosensitization of Nanocrystalline TiO2 Films Utilizing Al2O3 Layers in Dye-Sensitized Solar Cells


  • This work was supported by the Korea Science and Engineering Foundation (KOSEF) through the National Research Lab. Program funded by the Ministry of Science and Technology (No. R0A-2005-000-10034-0), and BK-21 (2006). M.G. and M.K.N. thank Swiss Federal Office for Energy (OFEN). E.P. thanks the Spanish MEC for the CONSOLIDER-HOPE 0007-2007, and the CTQ2007-60746/BQU project.


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Doubly sensitized: Stepwise cosensitization is carried out on Al2O3-coated nanocrystalline TiO2 layers using two organic dyes (JK-2 and SQ1) having complementary spectral absorption bands in the visible region. The Al2O3 coating results in the retardation of the interfacial charge recombination dynamics at the oxide/sensitizer interface and improves the overall performance of the dye-sensitized solar cells. CB=conduction band.