Mitigating deep-level defects through a self-healing process for highly efficient wide-bandgap inorganic CsPbI3−xBrx perovskite photovoltaics

Thermal admittance spectroscopy is used to explain the self-healing process in the wide bandgap inorganic CsPbI 3− x Br x . It is revealed that the deep-level interstitial defects in the fresh film can be self-healed when stored in a low-humidity ambient condition.