Radiation-resistance in cesium-doped perovskites: mechanisms, challenges, and future prospects

Cesium-doped mixed halide perovskites show unique potential in radiation-prone environments because their response to gamma rays is not purely destructive. At lower doses (< 10 kGy), radiation can passivate defects, improving optoelectronic properties, with irreversible damage like halide segregation only dominating at very high doses (> 21 kGy). Critically, cesium doping strengthens the perovskite lattice itself, slowing ion migration and boosting intrinsic stability. However, a significant gap remains between laboratory testing (100 kGy) and the demands of long-term space missions (500 kGy). This review analyzes recent advances to move beyond simply observing these effects and toward a predictive framework for designing radiation-hardened perovskites by linking experimental data with theoretical models and standardized practices.