Revisiting the Exposed Surface Characteristics on the Stability and Photoelectric Properties of MAPbI.

CHNHPbI (MAPbI), as a promising candidate of photovoltaic materials, has attracted extensive interests due to its excellent photoelectric properties and low preparation cost. However, the relationship between synthesis parameter and performance is still unclear due to the overlook of exposed surface characteristics, limiting the mass-production and commercialization of MAPbI. Therefore, it is necessary to clarify the stability and photoelectric properties of different exposed surfaces of MAPbI under humid environment.