How can I prepare iodidetriiodide redox couple solution for solar cell?

To prepare an iodide/triiodide redox couple solution for a solar cell, dissolve potassium iodide (KI) and iodine (I2) in a suitable solvent, typically acetonitrile or water, to achieve the desired concentration. A common ratio is around 0.1 M KI with a small amount of I2 (e.g., 0.01 M) to ensure effective redox behavior. Stir the solution until all components are fully dissolved, and filter if necessary to remove any undissolved particles. Finally, store the solution in a dark, airtight container to prevent degradation.