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4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 221 wt.% of rGO provided the following electrical parameters: Jsc of 0.08 mA cm -2 , Voc of 0.26 V, and a conversion efficiency of 0.013 %. Compared with inverted solar cells based on the TiO2 porous films, the TiO2-rGO devices exhibited an increase in Jsc attributed to the improved interconnectivity between TiO2 nanoparticles and graphene. In this case, the carbonaceous material introduced an alternative electrical conduction pathway which facilitates rapid electron transport in the photoelectrode. We acknowledge support from CAPES, CNPq and FAPESP. References [1] Singh, V., Joung, D., Zhai, L., Das, S., Khondaker, S. I., Seal, S. "Graphene based materials: Past, present and future". Progress in Materials Science. 56, 1178-1271 (2011. [2] Yang, N. L., Zhai, J., Wang, D., Chen, Y. S., Jiang, L. "Two-Dimensional Graphene Bridges Enhanced Photoinduced Charge Transport in Dye-Sensitized Solar Cells". ACS Nano. 4, 887-894 (2010). [3] Kovtyukhova, N. I., Ollivier, P. J., Martin, B. R., Mallouk, T. E., Chizhik, S. A., Buzaneva, E. V., Gorchinskiy, A. D. "Layer-by-layer assembly of ultrathin composite films from micron-sized graphite oxide sheets and polycations". Chemistry of Materials. 11, 771-778 (1999). [4]Ng, Y. H., Lightcap, I. V., Goodwin, K., Matsumura, M., Kamat, P. V. "To What Extent Do Graphene Scaffolds Improve the Photovoltaic and Photocatalytic Response of TiO2 Nanostructured Films?" Journal of Physical Chemistry Letters. 1, 2222-2227 (2010). © SEFIN 2012
4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 222 C94 - Computational study of porphyrin sensitizers for solar cells: molecular design and binding mechanisms Negar Ashari Astani, Basile F. E. Curchod, Ivano Tavernelli, Ursula Roethlisberger EPFL, EPFL SB ISIC LCBC BCH 4118 (Bâtiment de chimie UN, Lausanne, 1004, CH An extensive computational study on porphyrin-based dyes including the design of dyes with optimal optical properties and the study of their chemisorption on the TiO2 substrate has been performed. These bioinspired porphyrin-based dyes have very similar key characteristics of the electron transfer processes as the best performing more conventional Ru-based sensitizers[1]. Furthermore, they exhibit strong Soret and long-wave length Q-band absorption spectra. In this work, we systematically explored substitutions at the four meso and eight β positions available for functionalization, to tune the UV-visible absorption spectra of these promising dyes. Time dependent density functional theory (TDDFT) calculations were carried out to determine the vertical absorption spectra. Results of these calculations revealed several new dyes with better absorption in the red. The additional practical problem of insufficiently strong anchoring of the dyes on the TiO2 substrate was also addressed. © SEFIN 2012
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