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4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 227 C98 - Flexible transparent electrode with printed metal grids Jae-Wook Kang, Do-Geun Kim, Jong-Kuk Kim, Chang Su Kim Korea Institute of Materials Science (KIMS), 66 sangnamdong, Changwon, Gyeongnam, 641-831, Korea Recently, organic solar cells (OSCs) have enormously advanced for last two decades. Flexible transparent conductive electrode (TCE) is one of the most important elements of flexible organic devices and it must have high flexibility and transmittance with low sheet resistance. Crystalline indium-tin-oxide (c-ITO) is the most widely used material for TCE. In spite of many advantages of c-ITO, large-area device performance is much lower than small devices because lower conductivity of c-ITO causes electrical power loss of devices. Figure 1 Flexible transparent electrode with printed metal grids and ITO electrode (200cm x 200cm) Moreover c-ITO cannot apply in flexible electronics because of its brittle property. Recently, various TCEs are developed such as indium-zinc-oxide (IZO), carbon nanotube, graphene, metal nanowire, and conducting polymer. But there still remains the trade-off among flexibility, sheet resistance and transparency. In this research, we propose novel concept of TECs which consists of metal electrodes embedded in a plastic substrate by printing process and ultra-thin amorphous ITO deposited by sputtering. We successfully demonstrated extremely flexible OSCs that continue to operate without degradation while being folded into a radius of
4 th Hybrid and Organic Photovoltaic Conference -Uppsala 2012 228 C99 - Mesoporous TiO2 microbead electrodes in cobalt-electrolyte based dyesensitized solar cells Meysam Pazoki a , Gerrit Boschloo b , Anders Hagfeldt b , Nima Taghavinia a a, Department of Physics,sharif university of technology, Azadi street, Tehran, 11155, IRan b, Department of Physical Chemistry, Uppsala University, Uppsala, Sweden Mesoporous TiO2 microbeads were synthesized by a combination of sol-gel and hydrothermal processes, and applied as photoanodes in dye-sensitized solar cells (DSCs). Microbeads were used in two different manners: as a pure microbead layer and on top of a transparent mesoporous TiO2 layer as a scattering layer. After sensitization with D35 and in combination with a cobalt trisbipyridine electrolyte, efficiencies of 3.7 % were obtained for a 5 micron microbeads layer and 5.9 % for 5 micron DSL 18NR-T + 5 micron microbeads doublelayer. Figure 1 Mesoporous Micro-Bead photoanode for Cobalt electrolyte based dye sensitized solar cell The fabricated DSCs were characterized by square wave small perturbation, electrochemical impedance spectroscopy and absorption/transmission techniques. Microbead electrodes show very rapid electron transport, but similar electron lifetimes as standard mesoporous films. They possess very good light scattering properties. © SEFIN 2012
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