Influence of ionic pretreatment on the performance of solid electrolyte dye-sensitized solar cells

Dye-sensitized solar cells (DSSCs) were manufactured with liquid iodine/iodide electrolyte solution in acetonitrile and a solid electrolyte based on plasticized poly(ethylene oxide) (PEO). Two types of titania electrodes manufactured from two-ingredient precursors were used to assess the efficacy of the solid electrolyte and the improvement produced by two chemical treatments. Solid electrolyte devices with a liquid electrolyte pretreatment applied to the electrolyte-oxide interface demonstrated improved photovoltaic performance compared to untreated solid electrolyte devices and solid electrolyte devices given an electrode-bulking sol treatment. Devices using electrodes made from hydrothermally synthesized titanate nanotubes resulted in lower performance than those made from the typically-used titania nanopowder, with significant performance loss resulting from the substitution Of solid for liquid electrolyte, indicating the critical dependence of performance on electrolyte infiltration into the oxide layer. (c) 2012 Elsevier Ltd. All rights reserved.