Aerosol OT/Water System Coupled with Triiodide/Iodide (I₃⁻/I⁻) Redox Electrolytes for Highly Efficient Dye‐Sensitized Solar Cells

Abstract Dye‐sensitized solar cells (DSCs) are considered to be a promising alternative to Si‐based photovoltaic cells. The electrolyte of the DSC primarily uses triiodide/iodide (I₃⁻/I⁻) as a redox couple. Therefore, it is essential to understand the regeneration and recombination kinetics of the I₃⁻/I⁻ redox couples in the device. In this context, controlling the total and local concentrations of the I₃⁻/I⁻ redox couples is an important parameter that can influence the DSC performance. Here, we propose that the introduction of a sodium bis (2‐ethylhexyl) sulfosuccinate (AOT)/water system to the I₃⁻/I⁻ electrolyte enables the control of the concentration of the redox couples, which consequently achieves a high power conversion efficiency of ∼11% for ∼1000 h (under 1 sun illumination) owing to the enhanced dye‐regeneration efficiency and the reduced recombination rate. This novel concept assists in the comprehension of the regeneration and recombination kinetics and develops highly efficient DSCs.