Reducing Hot Carrier Cooling Rate in Metal Halide Perovskites Through Lead Vacancies: Time-domain Ab Initio Analysis

Pb vacancies slow down hot carrier cooling dynamics in MAPbI 3 perovskites by introducing intraband states that can trap holes and by decreasing the deformation of the [PbI 6 ] 4− octahedron, which leads to weakened electron–phonon coupling.