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4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 19 A4 - Star-Shaped Ruthenium Polypyridyl Complexes: Binding Control on Metal Oxide Surfaces Elena Galoppini Rutgers University Chemistry Department, 73 Warren Street, Newark, New Jersey, 0, US Control of charge transfer between dye-linker-anchor sensitizers to metal oxide (MO) semiconductor interfaces is important for renewable energy projects involving nanostructured semiconductors. However, it is difficult to control effectively the positioning of a molecule on a MO surface, a prerequisite to engineer and study this complex interface. Uncertainty over the binding mode and orientation, and the heterogeneity of the nanostructured metal oxide films can prevail over the molecular design. A series of novel homoleptic Ru(II) star complexes were synthesized as part of a new surface engineering strategy. In the nano-sized, highly symmetrical star-shaped complexes, the Ru(II) center is coordinated to three identical bipyridine ligands carrying conjugated oligophenylenethynylene rigid linker units with or without solubilizing alkoxy chains, and terminating with carboxylic anchor groups. The chromophoric Ru(bpy) core cannot come in close contact to the semiconductor surface. We will describe the synthesis, properties in solution and bound. Synthetic modifications, computational studies and binding studies to enhance injection yield are in progress and will be presented in the poster.We will also describe other new surface engineering concepts involving host-guest chemistry that are being developed in our group. References [1] Y. Zhang, E. Galoppini, P. G. Johansson, G. J. Meyer, Pure Appl. Chem., 2011, 83, 861–868. [2] P. G. Johansson, Y. Zhang, M. Abrahamsson, G. J. Meyer, E. Galoppini, Chem. Commun., 2011, in press DOI: 10.1039/c1cc11210d © SEFIN 2012
4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 20 A5 - Charge generation and recombination in dye-sensitized nano-structured TiO2 films Ryuzi Katoh a , Akihiro Furube b a, Nihon university, Koriyama,, Fukushima, 963, JP b, AIST, Tsukuba, Ibaraki 305-8565, JP Physical chemistry of photo-energy conversion reaction systems is very important issue leading to feature solar energy conversion devices. In this context, we have so far studied primary reaction processesin dye-sensitized solar cells and organic solar cells using timeresolved laser spectroscopy. Novel techniques are required and we have developed highly sensitive transient absorption spectrometer with wide-wavelength detection range (400-2500 nm). Since electron injection process is a key process torealizehigh performance in DSSC, we have systematically studied electron injection process in dye-sensitized nano-structured semiconductor films[1]. We estimated the absolute valueof electron injection efficiency from excited dyes to nano-structured semiconductor films in various sensitizer dyesand semiconductors. We also examined the effect of excitation wavelength, excitation density, solvents and ions. Finally, we found that almost unity injection efficiency can be realized in such films under particular conditions. We are studying transient absorption in wide-time range to identify the limiting factor of electron injection efficiency. Recombination between an injected electron and a parent cation is also important issue to optimize solar cell performance. It has been reported that the recombination is very slow process in 10 -3 sec compared with the electron injection time (
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