Methylammonium lead iodide (CH3NH3PbI3) is an extensively used perovskite material with a remarkable potential for solar energy conversion. Despite its high photovoltaic efficiency, the material suffers from fast degradation when aging in atmospheric conditions and/or under sunlight. Here we review the principal degradation mechanisms of CH3NH3PbI3, focusing on the thermodynamic, environmental and polymorphic parameters that impact on the stability of the material. A critical analysis of the available data indicates that degradation under ambient conditions is a defect-generation process that is highly localized on surfaces and interfaces, while it is further enhanced above the tetragonal-cubic transition at∼ 54° C. Within this context, we discuss the conservative role of N2 and propose strategies for the emergence of industrially viable hybrid photovoltaics.
American Chemical Society
15 May 2018
The journal of physical chemistry letters