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4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 127 400C) and sintering. Sample (A) has prepared by thin film blocking under layer that fabricated with sol-gel method. Also sample (B) has prepared by TiCl4 treatment as a common blocking under layer and sample (C) was without under layer and prepared as a blank sample. The working electrodes were immersed in a dye bath containing 0.2 mM D35 in ethanol and left 1 hr in 50 °C. The solar cells were assembled, using a 30 µm thick thermoplastic Surlyn frame, with a platinized counter electrode, which was prepared by depositing 10 µL cm -2 , 4.8 mM H2PtCl6 solution in ethanol to the glass substrate followed by heating in air at 400 °C for 30 min. Figure 1 Current density versus applied potential curves. (a), (c) and (e) are under dark but (b), (d) and (f) are under AM1.5G illumination for DSC sensitized with D35. (a) and (b) are in 3-methoxy proponitrile with cobalt mediator, (c) and (d) are in acetonitrile with cobalt mediator and (e) and (f) are in acetonitrile with ferrocene mediator. (■) for solar cells with sol-gel treatment blocking layer, (▲) for solar cells with TiCl4 treatment blocking layer and (●) for solar cells without under layer. An electrolyte solution was then introduced through two holes predrilled in the counter electrode, and the cell was sealed with thermoplastic Surlyn covers and a glass coverslip. Unless otherwise noted, the electrolyte1 consisted of 0.22 M [Co(bpy)3](PF6)2, 0.033 M [Co(pby)3](PF6)3, 0.1 M LiClO4, and 0.2 M 4-tert-butylpyridine (TBP) in 3-methoxy proponitrile as same as for acetonitrile and electrolyte 2 consisted of 0.22 M ferrocene, 0.033 M ferrocenium and same previous amont of LiClO4 and TBP. The current-voltage curves for this series of DSCs are shown in Figure 1. In result from the I-V curves we can see very good dark effect for (A) sample in 3-methoxy proponitrile solvent and partial good dark effect in © SEFIN 2012
4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 128 acetonitrile solvent, Fig 1a and 1c respectively. We have observed a good improvement in Voc and fill factor (FF) in sample (A) in compare with other samples that show less recombination of electron to oxidized dye or cobalt mediator with good nanocrystalline interaction between mesoporous layer and titania blocking thin film because of same particle size and same anathase crystalline phases. This lead to faster electron injection from mesoporous layer to under layer and FTO. References [1] B. O'Regan, M. Grätzel. Nature, 353, 737 (1991). [2]A. Yella, H.-W. Lee, H.N. Tsao, C. Yi, A.K. Chandiran, Md.K. Nazeeruddin, E.W.G. Diau, C.-Y. Yeh, S.M. Zakeeruddin, M. Grätzel. Science, 334, 629 (2011). [3] J. Kruger, R. Plass, L. Cevey, M. Piccirelli, M. Grätzel, U. Bach. Appl. Phys. Lett., 79, 2085 (2001). [4] P.J. Cameron, L.M. Peter, S.M. Zakeeruddin, M. Grätzel. Coord. Chem. Rev., 248, 1447 (2004). [5] J. Kruger, R. Plass, M. Grätzel, P.J. Cameron, L.M. Peter. J. Phys. Chem. B, 107, 7536 (2003). [6] P.J. Cameron, L.M. Peter. J. Phys. Chem. B, 107, 14394 (2003). [7] M.H. Habibi, M. Zendehdel. Current Nanoscience, 6, 642 (2010). © SEFIN 2012
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