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Assembling the Solar Cell After the first slide had absorbed the dye, it is quickly rinsed with ethanol to remove any water. It is then blotted dry with tissue paper. Quickly, the two slides are placed in an offset manner together so that the layers are touching. Binder clips can be used to keep the two slides together. One drop of a liquid iodide/iodine solution is then added between the slides. Capillary action will stain the entire inside of the slides How Does All This Work? The dye absorbs light and transfers excited electrons to the TiO2. The electron is quickly replaced by the electrolyte added. The electrolyte in turns obtains an electron from the catalyst coated counter electrode. TiO2=electron acceptor; Iodide = electron donor; Dye = photochemical pump Ionic Liquids in General Ionic liquids are liquids formed only of ions. Ionic liquids do not have a solvent component. Ionic liquids have a low vapor pressure so they are non-volatile. Picture taken from Chem. World. June 2004, V:1(6) Martin Earle-Quill Room Temperature Ionic Liquids (RTILs) A RTIL is an ionic material that is liquid at room temperature. They are based primarily on asymmetric organic cations paired with inorganic anions. By changing the ions, a countless variety of RTILs can be obtained. The asymmetric shape of the cations prevents the packing and the formation of solids at RT. Air and water resistant. Can be hydrophilic or hydrophobic. Possible Applications of Ionic Liquids Applications as Solvent: They are non volatile and recyclable. Suitable for extraction processes without loss of solvent. ‘Chemically Active’ Solvent: Catalytic activity. New Propellants and Fuels: High energy density that may be used in propulsion. Application as electrolyte in Solar Cells: non-leaking and good charge transport properties Dye-sensitized solar cells: Components Granular TiO2 forming a nanoporous structure. A dye, which is a light sensitive substance spread on the TiO2 surface. A redox couple (I