Abstract
Dye-sensitized solar cell (DSC) consists of a TiO 2 nano film of the photo electrode, dye molecules on the surface of the TiO 2 film, an electrolyte layer and a counter electrode. Among these, the nano porous TiO 2 film plays an important role as the photo electrode in DSC because it adsorbs a large number of the dye molecules which provide electrons. Therefore, the condition of the TiO 2 film affects the cell performance such as current density ( J sc), open circuit voltage ( V oc) and fill factor (FF). The thickness of TiO 2 film is one of these conditions. Its variation influences on the internal impedances of DSC related to the electron transport. In this study, we analyzed the characteristics of DSC with the different thicknesses of TiO 2 film by using electrochemical impedance spectroscopy (EIS) in details. As a result, it was demonstrated that the variation of the TiO 2 thickness has an effect on the electron transport in the DSC. Finally, the TiO 2 thickness is optimized for the best performance of DSC.
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