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4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 245 addition of carbon-based materials, such as carbon black, carbon nanotubes, among others, in order to increase the electrical conductivity of the CE layer. In summary, we demonstrated the possibility to use graphene-like MoS2 as CE layers for DSCs at low temperature with considerable electrocatalytical activity towards the regeneration of the iodide/tri-iodide redox couple. References [1] Wu, Mingxing, Wang, Y., Lin, X., Yu, N., Wang, L., Wang, L., Hagfeldt, A., Ma T. "Economical and effective sulfide catalysts for dye-sensitized solar cells as counter electrodes” Phys. Chem. Chem. Phys. DOI: 10.1039/c1cp22819f Matte, H. S. S. R., Gomathi, A., Manna, A. K., Late D. J., Datta, R., Pati, S. K., Rao, C. N. R. “MoS2 and WS2 Analogues of Graphene” Angew. Chem. Int. Ed., 49, 4059-4062 (2010). [2] Chang K., Chen W., Ma, L., Li, H., Li, H. , Huang, F., Xu, Z., Zhang, Q., Lee, J.-Y. "Graphene-like MoS2/amorphous carbon composites with high capacity and excellent stability as anode materials for lithium ion batteries" J. Mater. Chem., 21, 6251-6257 (2011). © SEFIN 2012
4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 246 C111 - Synthesis and characterization of semiconductor nanoparticles for application in solid state solar cells Zuzanna Glebicka, Magdalena Skompska a, Laboratory of Electrochemistry, Faculty of Chemistry, University of Warsaw , Pasteura 1, Warsaw, 02093, PL As third generation solar cells are considered as promising renewable energy sources, a lot of attention is focused on improving their efficiency and stability. These cells consist of metal oxide (ZnO, TiO2) nanostructures decorated with light harvesting material (most often a dye). Recently, solid state semiconductor-sensitized solar cells have been regarded as interesting alternative for dye-sensitized solar cells. For this application, CdS and CdSe quantum dots were obtained in this work by reversed micelle method (synthesis carried out in water-in-oil microemulsion). This procedure not only requires the use of surfactant but also allows the functionalization of nanoparticles by selected ligand which may act as a linker between metal oxide and nanoparticle. Depending on the kind and structure of the ligand used, its presence may facilitate the formation of hybrid material but on the other hand, it can also block the charge transfer across the interface. From this point of view, it is reasonable to use a shortchained ligand with specified charge (such as 2-mercaptoethane sulfonate) which may facilitate an electrophoretic deposition of nanoparticles on TiO2 or ZnO substrates. Thus, the key point of synthesis is absolute removal of basic emulsifier (in this case AOT - sodium dioctyl sulfosuccinate) from the nanoparticle surface to leave only the molecules of selected ligand. In this work two different methods of washing it out were applied to verify their effectiveness. The mechanism of purification nanoparticles from the surfactant and its further functionalization was carefully examined by infrared spectroscopy. Figure 1 HRTEM image and SAED pattern of CdSe nanoparticles Apart from that, the reversed micelle method allows also full control of the size, shape and crystallographic structure of obtained nanoparticles. The factors affecting these properties are: W parameter (water to surfactant molar ratio), the reactants molar ratio, kind of solvent used as dispersed phase, time and conditions of the reaction. All these parameters were changed during the subsequent syntheses so the obtained nanoparticles varied in size and properties. Characterization of nanoparticles was done by means of spectroscopic and microscopic methods: UV-Vis, FTIR spectroscopies, photoluminescence, X-ray diffraction and X-ray © SEFIN 2012
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