![]() ![]() β-ZnTe(en)0.5, which uniquely has over 15-year real-time degradation data, is taken as a prototype structure to demonstrate an accelerated thermal aging method for assessing the intrinsic and ambient-condition long-term stability of hybrid materials. These results suggest that the surface acts as a location for photogenerated carrier accumulation, leading to degradation and PbI2 formation.read more read lessĪbstract: Organic-inorganic hybrid materials often face a stability challenge. From experimental kinetic modeling, PbI2 nuclei on the surface grow until they meet in the polycrystalline films, proceeding one-dimensionally inward from the surface. Whereas with a moderate level of heating into the cubic phase, accelerated photodegradation occurs in a single crystal. However, the rate of change with excitation density increases with more grain surfaces. Subtle surface changes occur below an excitation density threshold PbI2 formation scales linearly above this threshold in thin films. The photodegradation process of methylammonium lead triiodide (MAPbI3) investigated with above bandgap excitation Raman spectroscopy displays two stages of structural change in polycrystalline films of varying domain sizes and a single crystal. Abstract: Organic–inorganic hybrid perovskites display remarkable photovoltaic properties, but instability arises from the material’s surface and photoexcitation. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |