Dye-sensitized solar cells (DSSC) promise to offer a solution to low-cost large-area photovoltaic applications. They are fabricated from easily processable materials, deriving their competitive performance from judicious molecular design and control of nanoarchitecture rather than particularly impressive electronic characteristics of the individual materials.
The standard structure of the dye-sensitized solar cell comprises an electrochemical cell composed of mesoporous titania sensitized with light-absorbing dye molecules and filled with a redox-active liquid electrolyte (iodide/triodide based).1 Under light absorption, photogenerated electrons are injected from the dye into the conduction band of the TiO2, which are subsequently transported to and collected at the anode. The function of the electrolyte is to “regenerate” the oxidized dye and to transport the “holes” to the external circuit. Because of concerns over solvent leakage and corrosion, recent attention has been focused on replacing this electrolyte with solid state hole transporter alternatives to create fully electronic DSSCs. For this approach, spiro-MeOTAD has proven to be most successful due to its respectable charge carrier mobility, 11 amorphous nature, and high solubility. It is available under the name SHT-263 livilux® Art.no: 480731
Other compatible hole transport materials are under development.
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