Ionic Liquids: From Synthesis to Applications in Solar Cells.

Ionic liquids continue to find applications in an ever-increasing range of technologies. Here we describe some of the key routes used to prepare ionic liquids and then relate their properties to their applications. In particular, ionic liquids have been used to facilitate crystal growth and, for this reason, are emerging as useful solvents/additives in the preparation of perovskite films. The role of ionic liquids in these films and how they lead to perovskite solar cells with high efficiencies and stabilities is described.