Dye-sensitized Solar Cell (DSC) is one of the next new energy resources, as is well known. The list of those advantages goes on and on; low cost productivity (short pay-back time), colorful design, free module types, possibility of gigantic cells and so on. The great-granddaddy of them all is ease of “Flexible Cell” which many researchers have been researching since it was clarified by some revolutionary works that the strong flexible TiO₂ electrode on the plastic conductive substrate could be available to be made at room temperature without other additive components such as polymer or oligomer.
Peccell Technologies has been devoting our energy to produce the practical flexible DSC for several years. PECC series is one of the best pastes to generate the good TiO₂ mesoporous electrode at low temperature, having well adherence property to the substrate, high efficiency (η≈6%). The transparent conductive film (with Fujimori Kogyo Co., Ltd.) has low electric resistivity (< 1Ω/□) and high transparency (> 70%). Also the electrolyte, the sealant and the counter electrode have been developed for the good flexible DSC. However those ingredients especially the TiO₂ paste and the conductive films were made by small lot size, and then there were limited numbers of the cell made continuously or in large quantities. We have succeeded in gain how to make the reliable materials, the TiO₂ paste, the substrate and the others, so eventually the mass-production is available with some general machines at lower-cost energy.