Analysis of mutual electrolyte structure applied in arrayed flexible dye-sensitized solar cells

In this study, the mutual electrolyte structure of arrayed flexible dye-sensitized solar cell (FDSSC) was used to decrease the internal impedance. The ITO-PET substrate was etched the conductive layer (ITO) by etching solution, which designed arrayed pattern. TiO₂ thin film was fabricated on the arrayed conductive substrate by spin-coating. The arrayed flexible dye-sensitized solar cell with mutual electrolyte structure can be well avoided electrolyte to contact ITO layer directly, which increased photovoltaic conversion efficiency. The arrayed flexible dye-sensitized solar cell with mutual electrolyte structure has excess electrolyte, which can obtain sufficient redox from crevice between cell and cell of mutual electrolyte structure. Compared different distances between cell and cell of mutual electrolyte structure, and the experimental results were confirmed by photovoltaic characteristic parameters and Electrochemical Impedance Spectroscopy (EIS). According to the experimental results, the distance of 1 mm has optimal characteristic parameter, which the open circuit voltage (V_OC) is 0.81 V, the short circuit current density (J_SC) is 1.70 mA/cm², and the photovoltaic conversion efficiency is 0.37 %.