In situ anion exchange with redox mediators influencing the photovoltaic parameters in vacancy-ordered halide perovskite-based photoelectrochemical solar cells

The photoelectrochemical solar cells with vacancy-ordered perovskite undergo anion exchange with components in the electrolyte. This study unravels the role of iodide in the redox mediator on the phase stability of the Cs 2 Pt(Cl/Br) 6 absorber.