Probing the Structural Degradation of CsPbBr Perovskite Nanocrystals in the Presence of HO and HS: How Weak Interactions and HSAB Matter.

Structural degradation of all inorganic CsPbBr in the presence of moisture is considered as one of its major limitations to use as an active component in various light-harvesting and light-emitting devices. Herein, we used two similar molecules, HO and HS, with similar structures, to follow the decomposition mechanism of CsPbBr perovskite nanocrystals. Interestingly, HO acts as a catalyst for the decomposition of CsPbBr, which is in contrast to HS.