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4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 133 demonstrating the excellent electron-collecting property of the UV-irradiated TiO2 films. The integration of UV-treated TiO2 solutions in conventional devices results in doubled power conversion efficiency for the thinner active layer and in maximum power conversion efficiency of 2.8% for 110 nm thick device. In addition, we have demonstrated, with the support of device characterizations and optical simulations that the TiO2 nanocrystal buffer layer acts both as electron-transporting/hole-blocking material and optical spacer. Refenereces *1+Kim, J.Y.; Lee, K.; Coates, N.E.; Moses, D.; Nguyen, T.Q.; Dante, M.; Heeger, A.J. “Efficient Tandem Polymer Solar Cells Fabricated by All-Solution Processing”. Science 317, (2007). *2+Chen, L.-M.; Hong, Z.; Li, G.; Yang, Y. “Recent Progress in Polymer Solar Cells: Manipulation of Polymer:Fullerene Morphology and the Formation of Efficient Inverted Polymer Solar Cells”. Adv. Mater. 21, (2009). *3+Park, M.H.; Li, J.H.; Kumar, A.; Li, G.; Yang, Y. “Doping of the Metal Oxide Nanostructure and its influence in Organic Electronics”. Adv. Funct. Mater. 19, (2009). *4+Park, J.H.; Lee, T.W.; Chi, D.; Wang, D.H.; Park, O.O. “Roles of Interlayers in Efficient Organic Photovoltaic Devices”. Macromol. Rapid Commun. 31, (2010). © SEFIN 2012
4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 134 C27 - Ruthenium Fulvalene Compounds for Solar Thermal Energy Storage and Conversion Karl Börjesson a , Kasper Moth-Poulsen a , Dusan Coso b , Nikolai Vinokurov c , Arun Majumdar b , Peter Vollhardt c , Rachel Segalman c a, Chalmers Tekniska Högskola/kemi/polymerteknik, Kemivägen 10, Göteborg, 41296, SE b, Mechanical Engineering, UC Berkeley, Berkeley, CA, United States c, College of Chemistry, UC Berkeley, Berkeley, CA, United States In a future society with limited access to fossil fuels, technologies for efficient on demand delivery of renewable energy are highly desirable. In this regard, methods that allow for solar energy storage and on demand solar driven power generation are particularly relevant since the sun is the most abundant energy source. 1 Recently, some attention has been directed toward an organometallic fulvalene diruthenium couple which has shown great potential for energy storage capabilities and photoconversion in solution. 2-4 Here, we report on a derivative of this organometallic molecule that can store solar energy in the form of chemical bonds and release the stored energy in the form of heat in a reversible manner when stimulated thermally or catalytically. Figure 1 Conceptual illustration of a solarthermal energy storage system. The energy storage material is energetically excited by flow through a high surface area solar collector. From there it either can be temporarily stored or directly pumped to a solid state catalysis device where the stored heat is extracted by heat exchange. Demonstration of the practical function of this material in a device is achieved by near complete conversion of highly concentrated solutions of the molecule in a continuous flow micro fluidic reactor by the means of light generated by a solar simulator. Our DSC measurements indicate that this novel organometalic compound can store 109 kJ/mol and with a solubility of more than 0.4 M in toluene could then potentially provide an adiabatic temperature rise of up to 30 o C. References [1] Acc. Chem. Res. 42, 1859-1860 (2009). 2. J. Am. Chem. Soc. 119, 6757-6773 (1997). 3. Synthesis, 3373-3379, (2005). 4. Angew. Chem. Int. Ed. 49, 1-5, (2010). © SEFIN 2012
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