Inactive (PbI 2 ) 2 RbCl stabilizes perovskite films for efficient solar cells

Inactive (PbI 2 ) 2 RbCl stabilizes perovskite films for efficient solar cells In halide perovskite solar cells the formation of secondary-phase excess lead iodide (PbI 2 ) has some positive effects on power conversion efficiency (PCE) but can be detrimental to device stability and lead to large hysteresis effects in voltage sweeps. We converted PbI 2 into an inactive (PbI 2 ) 2 RbCl compound by RbCl doping, which effectively stabilizes the perovskite phase. We obtained a certified PCE of 25.6%...