Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Some results dealing with the synthesis, characterization and functional proprieties, as DSSC photo-anode active material, of solid solutions of nanostructured oxide materials hierarchically organized is presented. Solid solutions of scandium in anatase as semiconductor material for DSSC photo-anodes were prepared. The final powder was constituted by mesoporous anatase beads doped with Sc. A superstructure characterizes the beads, which are spherical at the microscopic level (≈ 1 µm) and rice-gran-shaped at the nanoscopic level (≈ 20nm). The scope of this work is to usefullymodify the band structure of anatase with respect to the electronic level of the light harvesting dye and to improve its electronic conductivity due to the creation of donor or acceptor levels. The final objective is to increase the DSSC conversion yield through searching for the better electronic coupling TiO2-anatase/dye since this is one of the most important factors influencing the performances of a DSSC. Several DSSCs with photo-anodes at different Sc doping levels were prepared and tested both under simulated solar radiation and in the dark. The maximum efficiency of 9.6% was found at 0.2 at. % of Sc in anatase, that is 6.7% higher with respect to the DSSCs with pure anatase. The next step of our work will be focused on co-doping of these mesoporous structures with Er3+ and Yb3+ for the upconversion of NIR photons to higher energy photons that can be absorbed by a conventional sensitizer, such as N719 dye, to try to improve in this way the photocurrent densityand conversion efficiency of DSSC. Therefore solid solutions of erbium and ytterbium in anatase as photo-anode will be prepared and tested in DSSC prototypes.
FEG-SEM image of a synthesized 670 nm diameter bead particle with 0.25 at. % of Sc in anatase. The bead is constituted by a large number of nanoparticles randomly oriented but organized as a sphere to minimize the surface energy. The insets A and B on the upper corners of the figure show beads doped with Sc at 1 and 10%, respectively.
Latini, A.; Cavallo, C.; Aldibaja, K. F.; Gozzi, D.; Efficiency Improvement of DSSC Photoanode by Scandium Doping of Mesoporous Titania Beads. J. Phys. Chem. C 2013, 117, 25276–25289.
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