Triple-Additive Strategy for Enhanced Material and Device Stability in Perovskite Solar Cells.

The stability of the FAPbI perovskite phase is significantly affected by internal strain. In this report, additives in the perovskite precursor solution are designed to prevent local lattice mismatch of the resulting perovskite layer. Instead of using a conventional methylammonium chloride (Control), triple additives (Target) are introduced by considering ion association and formation energy.