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4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 15 C143 Maria Brites, Érica Torres, Sara Sequeira, Paulo Mendes, Killian Lobato “Coumarin Dyes with Triple Bonds as pi-Spacer Units for Dye Sensitized Solar Cells” C144 Liisa Antila, Mikko Heikkilä, Ville Mäkinen, Viivi Aumanen, Marianna Kemell, Pasi Myllyperkiö, Karoliina Honkala, Hannu Häkkinen, Markku Leskelä, Jouko Korppi-Tommola “Effect of atomic layer deposited metal oxide barriers on interfacial electron transfer in dye-sensitized solar cells” C145 Tânia Frade, Killian Lobato, Anabela Gomes “Electrodeposited ZnO Nanorods for Dye-Solar Cells” C146 Norma Minar, Thomas Bein “Filling the pores: In-Situ Polymerization of MEH PPV into Porous Titania” C147 Ana Sofia Anselmo, Andrzej Dzwilewski, Ergang Wang, Mats R. Andersson, Jan van Stam, Krister Svensson, Ellen Moons “Molecular orientation and composition at the surface of APFO3:PCBM blend films” C148 Robson Raphael Guimarães, André Luis Araújo Parussulo, Henrique Eisi Toma, Koiti Araki “New Efficient and Tunable Ruthenium Photosensitizer for Dye Sensitized Solar Cells” C149 Sebastian Feihl, Rubén D. Costa, Stephan Pflocka, Cordula Schmidt, Susanne Backes, Jörg Schönamsgruber, Andreas Hirsch, Dirk M. Guldi “Nickel Oxide Nanostructured Electrodes for Perylenediimide-Based Dye-Sensitized Solar Cells” C150 Lei Yan, Xiaohui Wang, Xingzhu Wang, Xun Chen “A platinum-based poly(aryleneethynylene) containing thiazolothiazole group with high hole mobility for organic photovoltaic and field-effect transistor applications” C151 Jelissa De Jonghe, Jacques-Edouard Moser, Gaetan Wicht, Roland Hany, Frank Nueusch “Photoinduced Processes in Small Molecule/Fullerene Bilayers” C152 Alesja Ivanova, Thomas Bein “Synthesis and Characterization of Biotemplated Titania Porous Films” C153 Maurizio Furlani, T.M.W.J. Bandara, Bengt-Erik Mellander, Tommy Svensson, W.J.M.J.S.R. Jayasundara, Vito Di Noto, Christopher Frisk “Tetrahexylammonium Iodide containing Gel Polymer Electrolytes for Dye Sensitized Solar Cells and CdS QD Sensitized Solar Cells” C154 Erik Gabrielsson, Hanna Ellis, Haining Tian, Sandra Feldt, Gerrit Boschloo, Anders Hagfeldt, Licheng Sun “The Effect of the Auxiliary Donor Substituents on the D35 DYE” C155 Lorenzo Franco, Antonio Toffoletti, Marco Ruzzi, Luciano Montanari, Lucia Bonoldi, Claudio Carati, Riccardo Po “Which information EPR spectroscopy can provide on polymer/fullerene photovoltaic materials?” C156 Lei Yan, Juhua Ou, Xingzhu Wang, Chengxi Li “Novel Platinum-Containing Metallopolyynes as Polymer Semiconductors for Thin-Film Transistors and Bulk Heterojunction Solar Cells” C157 Pavel Chabera, Tobias Harlang, Sophie Canton, Villy Sundström “Ultrafast electron transfer of a Ru-Co photocatalysis model system” C158 Michele Tonezzer, Enrico Menin, Sara Carturan, Gianluigi Maggioni, Monica della Pirriera, David Gutierrez - Tauste, Stefano Conci, Alberto Quaranta “Novel hybrid and flexible photovoltaic devices” C159 Michele Tonezzer, Enrico Menin, Sara Carturan, Gianluigi Maggioni, Monica della Pirriera, David Gutierrez - Tauste, Stefano Conci, Alberto Quaranta “Improving solar cell efficiency with rare earth –based luminescent thin films” C160 Michele Manca, Francesco Todisco, Roberto Giannuzzi, Alessandro Cannavale, Raffaella Buonsanti, Luisa De Marco, Delia Milliron, Giuseppe Gigli “Dynamical modulation of the optical transmittance in multifunctional dye-sensitized photelectrochemical devices based on the implementation of indium-tin oxide plasmonic resonators” C161 Francesco Malara, Michele Manca, Christof Hübner, Elpida Piperopoulos, Giuseppe Gigli “Engineered carbon-nanotube-based composite plates as highly efficient free-standing counter electrodes for dye solar cells” C162 Ahmed El-Zohry, Burkhard Zietz “Aggregation and Isomerisation in the Solar Cell Dye D149” C163 Poul Erik Hansen, Phuong Tuyet Nguyen, Jacob Krake, Jens Spanget-Larsen, Torben Lund “Dye-sensitized Solar Cells and Complexes between Pyridines and Iodines. A NMR, IR and DFT study” C164 Andrea Lamberti, Adriano Sacco, Stefano Bianco, Diana Hidalgo, Diego Manfredi, Rossana Gazia, Marzia Quaglio, Angelica Chiodoni, Elena Tresso, Candido Fabrizio Pirri “High electron lifetime in transparent TiO2 nanotubes-based photoanode for front-illuminated dyesensitized solar cell” 285 286 287 289 290 291 293 294 296 297 298 299 300 302 303 305 307 308 310 312 313 314
4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 16 A1 - Nanostructured systems for the generation of electricity from sunlight Michael Graetzel Laboratory of Photonics and Interfaces, Ecole Polytechnique Fédérale de Lausanne, Station 6,LPI EPFL, CH-1015, Lausanne, Switzerland The performance of solar energy conversion devices employing mesoscopic photoelectrodes depends critically on their nanostructure [1,2] This is evident for the dye sensitized solar cell (DSC) where charge percolation through the TiO2 to the transparent conductive (TCO) electrodes takes milliseconds. Slow charge extraction increases chances of electron-hole recombination at the mesoporous TiO2 - electrolyte interface, and limits DSCs to be used with only a few electrolytes that offer low recombination rates. These limitations can be overcome with advanced nanostructuring techniques, the design of new sensitizers and new electrolytes. Here we describe our latest efforts to improve the photon harvesting and the charge carrier collection transport in these mesoscopic solar energy conversion systems. For the last tow decades, only triodide/iodide based redox electrolytes have attained PCEs over 10%. However recently a particularly exciting advance has been made by combining Co(II/III) complexes with organic donor –acceptor dyes [3]. Poprhyrien based donor acceptor systems have now attained already PECs of 12.3 % [4] and the recent achievement of strikingly high open circuit voltages close to 1.1. V [5] forebodes well for realizing DSC with new record performance in the near future. References [1]Grätzel, M. "Photoelectrochemical Cells", Nature 2001, 414, 338-344 [2] Grätzel, M. "Recent advances is mesoscopic solar cells" Acc. Chem. Res. 2009. 42, 1781-1798. [3] Feldt S. M.; Gibson E. A.; Gabrielsson, E. ; Sun L.; Boschloo, G.; Hagfeldt, A. Design of Organic Dyes and Cobalt Polypyridine Redox Mediators for High-Efficiency Dye-Sensitized Solar Cells J. Am. Chem. Soc. 2010, 132, 16714- 16724. [4] Yella A.; Lee H.-W.; Tsao H. N.; Yi C.;Kumar Chandiran A., Nazeeruddin Md. K.. W-G Diau W- G I E, Yeh, C.-Y. Zakeeruddin S. M.; Grätzel M. Porphyrin-sensitized solar cells with cobalt (II/III)-based redox electrolyte exceed 12 percent efficiency. Science 2011, 334, 629 - 634. [5] Yum J-H, Baranoff,E ; Kessler F; Moehl T; Shahzada A; Bessho T, Machioro M; Ghadin E; Moser J-E; Yi C; Nazeeruddin Md-K; Grätzel M. A cobalt complex redox shuttle for dye sensitized solar cells with high open circuit potential, Nature Comm 2012, DOE 10.1038/ncomm1635. © SEFIN 2012
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