Measuring Phase Changes to Predict Halide Perovskite Solar Cell Degradation

Halide perovskite solar cell stability has understandably become the major topic of discussion with regard to commercialization. Efforts have succeeded in making materials and devices which pass standard silicon durability tests, but accurate prediction of lifetime using accelerated degradation tests requires deep understanding of degradation mechanisms. We track the kinetics of the perovskite to non-perovskite phase transition which is found in many of these materials using a prototypical cesium lead halide compounds. Further exploration of this phase transition should lead to better predictions of material and device stability.