2, Pukyong National University, Pusan, , Korea (the Republic of)
3, University of Cambridge, Cambridge, , United Kingdom
The organic-inorganic hybrid perovskite materials have been interested because of their outstanding characteristics that enable a remarkable enhancement of device efficiency, raising them promising semiconductor candidates for light-emitting diodes (LEDs) and solar cells. High-quality perovskite films are required to realize highly efficient and stable perovskite devices. However, solution-processed perovskite films inevitably contain defect sites such as voids, pinholes, grain boundaries and under-coordinated ions, creating a large number of undesired electronic trap sites. Here, we investigate the significant beneficial effects using a new treatment based on amine-based passivating materials (APMs) to passivate the defect sites of methyl ammonium lead tribromide (MAPbBr3), resulting in improved efficiency and long-term stability of perovskite light-emitting diodes (PeLEDs).