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4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 219 C92 - Photo-Induce Electron Transfer of Ruthenium Complexes with One and Two Linked Viologens Trapped CB[7] in Organic Solution Thitinun Karpkird a , Pattraporn Saiwattanasuk a , Supa Hannongbua a , Licheng Sun b a, Department of Chemistry, Faculty of Science, Kasetsart University, 50 Phahonyothin Rd. Chatuchak , Bangkok, 10900, Thailand b, School of Chemical Science and Engineering, Department of Chemistry, Royal Institute of Technology (KTH), Teknikringen 30, Stockholm, 10044 , Sweden The supramolecular of Ruthenium complexes, Ru(bpy)3-viologen-Ru(bpy)3, with one and two viologen units, containing the CB[7] host (1 and 2) were synthesized and isolated in this work. The binding behavior of CB[7] to the guest Ruthenium complexes was investigated by using 1 H-NMR showed that the CB[7] preferable bind to the hydrocarbon linker in acetonitrile solution. The photophysical properties of the rotaxane 1 and 2 were also studied in acetonitrile solution resulting that the emission of Ru(bpy)3 unit could be increase in the presence of CB[7]. Figure 1 The photo-induce viologen radical formation could be monitored by UV-Vis spectrometry showed that the viologen radical could be formed and the longer live time of viologen radical could be longer by CB[7] host in non-aqueous solution. The viologen radical formation is more stabilized by the second viologen unit probably due to the intramolecular viologen radical dimer formed. These results demonstrate potentially new applications. References [1] Monhaphol, T. K.; Andersson, S.; Sun, L., "Isolated supramolecular Ru(bpy)3-Viologen- Ru(bpy)3 complexes with trapped CB[7,8] and photoinduced electron transfer study in non aqueous solution" Chem. Eur. J. 17, 11604-11612 (2011). [2] Andersson, S.; Zou, D.; Zhang, R.; Sun, S.; Sun, L. "Light driven formation of a supramolecular system with three CB[8]s locked between redox-active Ru(bpy)3 complexes" Org. Biomol. Chem. 7, 3605-3609 (2009). © SEFIN 2012
4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 220 C93 - Preparation and characterization of nanocomposites based on TiO2/graphene and their application on inverted solar cells Andréia de Morais a , Flávio Santos Freitas a , Helton Pereira Nogueira b , Ana Flávia Nogueira a a, Laboratório de Nanotecnologia e Energia Solar (LNES), Chemical Institute, Universidade Estadual de Campinas, Cidade Universitária Zeferino Vaz - Barão Geraldo, Campinas - SP, 13084-87, Brazil b, Grupo de Pesquisa em Polímeros (GPol), Chemical Institute, Universidade Estadual de Campinas, Cidade Universitária Zeferino Vaz - Barão Geraldo, Campinas - SP, 13084-87, Brazil The application of graphene in photovoltaic devices has received considerable attention due to its differential properties. However, many parameters of these devices must be improved, for example, the electron transport that occurs by diffusion through the oxide semiconductor film. The use of graphene incorporated into the oxide semiconductor film is an alternative to enhance the electron transport, since this material has excellent conductive properties [1]. In this work we present the synthesis of nanocomposites based on graphene and TiO2 nanoparticles and their application on inverted solar cells. The graphene oxide samples were obtained by the Hummers method [2]. Then, the reduced graphene oxide (rGO) was obtained by the method of ultraviolet irradiation-assisted photocatalytic reduction [3]. The TiO2-rGO nanocomposites were characterized by X-ray diffraction and Raman spectroscopy. The FEG- SEM images showed that the rGO sheets were decorated with TiO2 nanoparticles unevenly, but enough to prevent agglomeration. In general, the inverted solar cells were mounted with the following configuration: Au / PEDOT-PSS / poly (3-hexiltiofeno) (P3HT) / TiO2-rGO / blocking layer de TiO2 / conductive glass (FTO). Figure 1 FEG-SEM images obtained for TiO2–rGO nanocomposite. These solar cells were characterized using the current-potential curves (I-V) under polychromatic light irradiation at intensity of 41 mW cm -2 . The TiO2 electrode containing 0.07 © SEFIN 2012
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