Photoprotection in metal halide perovskites by ionic defect formation

Metal halide perovskites form defects as a response to intense light in order to protect themselves from overheating and degrading. The defects in turn alter the material properties to limit photon absorption, and thereafter, the defects gradually recover and restore the optoelectronic properties. In plants, mechanisms to reduce radiation damage serve the purpose of temporarily limiting the photon dose, and thereby photosynthesis, in order to improve photostability. Such a feature in halide perovskites is promising for their photovoltaic applications.