Application of Lead Acetate Additive for Printable Perovskite Solar Cell

Printable perovskite solar cells employ a device structure for which the organic-inorganic perovskite absorber is hosted by an inorganic mesoporous scaffold. Its advantages include simple fabrication process, low material cost and relatively high stability. However, it is challenging to homogeneously deposit high-quality perovskite crystals on the mesoporous scaffold. Herein, by incorporating lead acetate (Pb(Ac) 2 ) in the typical perovskite precursor, methylamine lead iodine (MAPbI 3 ), the crystal growth and pore-filling of the perovskite crystals in the mesoporous scaffold is improved by facilitating the crystal nucleation. Meanwhile, Ac -and MA + form MAAc which releases during thermal annealing process, resulting in excess PbI 2 in the perovskite layer which passivates the grain boundaries.